Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2008.0123 -- [AIX]
AIX OpenSSH creates trusted X11 cookie instead of untrusted
6 February 2008
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AusCERT Security Bulletin Summary
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Product: OpenSSH
Publisher: IBM
Operating System: AIX
Impact: Reduced Security
Access: Existing Account
CVE Names: CVE-2007-4752
Ref: AA-2007.0074
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IBM SECURITY ADVISORY
First Issued: Tue Feb 5 14:00:03 CST 2008
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VULNERABILITY SUMMARY
VULNERABILITY: AIX OpenSSH creates trusted X11 cookie instead of untrusted
PLATFORMS: AIX 5.2, 5.3, 6.1
SOLUTION: Apply the fix or workaround as described below.
THREAT: Privilege elevation
CERT VU Number: n/a
CVE Number: CVE-2007-4752
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DETAILED INFORMATION
I. DESCRIPTION
OpenSSH could allow a remote attacker to gain elevated
privileges. Trusted X11 cookies are created when untrusted cookies
cannot be created, which could allow an attacker to bypass
security restrictions and gain elevated privileges using an
untrusted X client.
II. PLATFORM VULNERABILITY ASSESSMENT
To determine if your system is vulnerable, execute the following
command:
lslpp -L openssh.base.server
The following fileset levels are vulnerable:
AIX 6.1: all versions less than or equal to 4.5.0.5301
AIX 5.3: all versions less than or equal to 4.5.0.5301
AIX 5.2: all versions less than or equal to 4.5.0.5201
III. FIXES
A fix is available for AIX 6.1 and 5.3. The fix can be downloaded
from:
http://downloads.sourceforge.net/openssh-aix/openssh-4.5p1-r2.tar.Z
A fix for AIX 5.2 is not yet available. Please check this site
for updates:
http://sourceforge.net/projects/openssh-aix
IV. WORKAROUNDS
There are no workarounds.
V. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd
Comments regarding the content of this announcement can be
directed to:
security-alert@austin.ibm.com
To request the PGP public key that can be used to communicate
securely with the AIX Security Team you can either:
A. Send an email with "get key" in the subject line to:
security-alert@austin.ibm.com
B. Download the key from a PGP Public Key Server. The key ID is:
0xA6A36CCC
Please contact your local IBM AIX support center for any
assistance.
eServer is a trademark of International Business Machines
Corporation. IBM, AIX and pSeries are registered trademarks of
International Business Machines Corporation. All other trademarks
are property of their respective holders.
VI. ACKNOWLEDGMENTS
This security vulnerability in OpenSSH was found and fixed by Jan
Pechanec.
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The University of Queensland
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