Sun Solaris uustat Buffer Overflow Vulnerability
iDefense Security Advisory 01.10.06
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=366
January 10, 2006
I. BACKGROUND
The uustat binary (part of the uucp project) is used to display or
cancel uucp requests as well as to provide general status on uucp
connections to other systems.
II. DESCRIPTION
There exists a buffer overflow venerability in the /usr/bin/uustat
binary in Sun Solaris 5.8 and 5.9.
The uustat binary is installed setuid "uucp" by default on Solaris. The
"-S" command line argument causes the binary to crash when followed
with a string that is greater than or equal to 1152 bytes in length.
The following shows the buffer being overflowed and then the o1
register being completely overwritten with the letter 'A':
bash-2.03% ls -l /usr/bin/uustat
---s--x--x 1 uucp uucp 62012 Jan 17 16:07 uustat
bash-2.03$ /usr/bin/uustat -S `perl -e 'print "A"x3000'`
Segmentation Fault
bash-2.03$
(gdb) info registers
g0 0x0 0
g1 0xff315e98 -13541736
g2 0x1cc00 117760
g3 0x440 1088
g4 0x0 0
g5 0x0 0
g6 0x0 0
g7 0x0 0
o0 0xff3276a8 -13470040
o1 0x41414141 1094795585
...
III. ANALYSIS
By exploiting this buffer overflow, an attacker can potentially gain
control of the return address of the executing function, allowing
arbitrary code execution with "uucp" privileges.
IV. DETECTION
Solaris 8 and 9 are running on SPARC and x86 architectures are
vulnerable.
V. WORKAROUND
iDefense is currently unaware of any workarounds for this issue.
VI. VENDOR RESPONSE
The vendor has released the following advisory to address this issue:
http://sunsolve.sun.com/search/document.do?assetkey=1-26-101933-1
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2004-0780 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
08/11/2004 Initial vendor contact
08/11/2004 Initial vendor response
01/10/2006 Coordinated public disclosure
IX. CREDIT
Angelo Rosiello (http://www.rosiello.org) is credited with discovering
this vulnerability.
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X. LEGAL NOTICES
Copyright (c) 2006 iDefense, Inc.
Permission is granted for the redistribution of this alert
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Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.
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