40401 : IBM AIX cfgcon swcons -p Argument Symlink Local Privilege Escalation
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Timeline

Disclosure Date
2007-08-14

Time to Patch	Time to Vendor Response
963 days	17 days

Description

<em style='font-weight:bold;'>(Description Provided by <a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=2007-5805" target="_blank">CVE</a>)</em> : cfgcon in IBM AIX 5.2 and 5.3 does not properly validate the argument to the "-p" option to swcons, which allows local users in the system group to create an arbitrary file, and enable world writability of this file, via a symlink attack involving use of the file's name as the argument. NOTE: this issue is due to an incomplete fix for CVE-2007-5804.

Classification

Location: Local Access Required
Attack Type: Race Condition
Exploit: Exploit Private
Disclosure: Vendor Verified

Solution

IBM has released a patch to address this vulnerability. Additionally, it is possible to temporarily work around the flaw by implementing the following workaround: Only allow trusted users local access to security critical systems. Limit access to the "system" group. Alternately, remove the set-uid bit from the swcons program.

Products

Unknown or Incomplete

References

CVE ID: 2007-5804 (see also: NVD) 2007-5805 (see also: NVD)
Bugtraq ID: 26258
Secunia Advisory ID: 27437
ISS X-Force ID: 38154
Related OSVDB ID: 40393 40394 40395 40396 40397 40398 40399 40400 40402 40403 40404 40405 40406 40407
Vendor Specific News/Changelog Entry: ftp://aix.software.ibm.com/aix/efixes/security/cfgcon_ifix.tar http://www-1.ibm.com/support/docview.wss?uid=isg1IZ02851
http://www-1.ibm.com/support/docview.wss?uid=isg1IZ03055
http://www-1.ibm.com/support/docview.wss?uid=isg1IZ03061
http://www-1.ibm.com/support/docview.wss?uid=isg1IZ03214
http://www14.software.ibm.com/webapp/set2/subscriptions/ijhifoeblist?mode=7&heading=AIX53&path=%2F200710%2FSECURITY%2F20071030%2Fdatafile100405
Mail List Post: http://archives.neohapsis.com/archives/bugtraq/2007-10/0432.html
Other Advisory URL: http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=611

Credit

Alex DeLarge - iDefense Labs VCP

CVSSv2 Score

CVSSv2 Base Score = 6.9
Source: nvd.nist.gov | Generated: 2007-11-06 | Disagree? | There are 1 more: View All

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