Technical Description

Multiple vulnerabilities have been identified in GD Graphics Library, which could be exploited by attackers to cause a denial of service or compromise an affected system.

The first issue is caused by an infinite loop error in the PNG reader when processing malformed data, which could be exploited by attackers to crash an affected application.

The second vulnerability is caused by an integer overflow error in the "gdImageCreateTrueColor()" function when processing a specially crafted "sx" argument, which could be exploited by attackers to execute arbitrary code.

The third issue is caused by an error in the "gdImageCreateXbm()" function, which could be exploited by attackers to crash an affected application.

The fourth issue is caused by errors in the GIF reader, which could be exploited by attackers to cause a denial of service or compromise a vulnerable system by tricking a user into opening a specially crafted image using an application linked against a vulnerable library.

Affected Products

GD Graphics Library version 2.0.35RC5 and prior

Solution

Upgrade to GD Graphics Library version 2.0.35 :
http://www.libgd.org/releases/

References

http://www.vupen.com/english/advisories/2007/2336
http://www.libgd.org/ReleaseNote020035
http://www.secweb.se/en/advisories/gd-gdimagecreatetruecolor-integer-overflow/

Credits

Vulnerabilities reported by the vendor, Mattias Bengtsson and Philip Olausson (Secweb).

ChangeLog

2007-06-26 : Initial release
2007-06-27 : Updated References

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