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Secunia Research 31/10/2007

- CUPS IPP Tags Memory Corruption Vulnerability -

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Table of Contents

Affected Software.......................................... ..........1
Severity.......................................... ...................2
Vendor's Description of Software.....................................3
Description of Vulnerability..................................... ....4
Solution.......................................... ...................5
Time Table............................................. ..............6
Credits........................................... ...................7
References........................................ ...................8
About Secunia........................................... .............9
Verification...................................... ..................10

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1) Affected Software

* CUPS 1.3.3.

NOTE: Other versions may also be affected.

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2) Severity

Rating: Moderately Critical
Impact: System Access
Where: Local network

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3) Vendor's Description of Software

"CUPS provides a portable printing layer for UNIX®-based operating
systems. It was developed by Easy Software Products and is now owned
and maintained by Apple Inc. to promote a standard printing solution.
It is the standard printing system in Mac OS X and most Linux
distributions".

Product Link:
http://www.cups.org/

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in CUPS, which can be
exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a boundary error within the
"ippReadIO()" function in cups/ipp.c when processing IPP (Internet
Printing Protocol) tags. This can be exploited to overwrite one byte
on the stack with a zero by sending an IPP request containing
specially crafted "textWithLanguage" or "nameWithLanguage" tags.

Successful exploitation allows execution of arbitrary code.

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5) Solution

Patches for various Linux distributions should be available shortly.

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6) Time Table

16/10/2007 - Vendor notified.
22/10/2007 - vendor-sec notified.
31/10/2007 - Public disclosure.

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7) Credits

Discovered by Alin Rad Pop, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2007-4351 for the vulnerability.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
customers with verified and reliable vulnerability intelligence
relevant to their specific system configuration:

http://corporate.secunia.com/

Secunia also provides a publicly accessible and comprehensive advisory
database as a service to the security community and private
individuals, who are interested in or concerned about IT-security.

http://secunia.com/

Secunia believes that it is important to support the community and to
do active vulnerability research in order to aid improving the
security and reliability of software in general:

http://corporate.secunia.com/secunia_research/33/

Secunia regularly hires new skilled team members. Check the URL below
to see currently vacant positions:

http://secunia.com/secunia_vacancies/

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/

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10) Verification

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2007-76/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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