Technical Description

Multiple vulnerabilities have been identified in Xpdf, which could be exploited by attackers to cause a denial of service or compromise a vulnerable system.

The first issue is caused by an array indexing error in the "DCTStream::readProgressiveDataUnit()" [xpdf/Stream.cc] method, which could be exploited by attackers to corrupt memory by tricking a user into opening a specially crafted PDF file.

The second vulnerability is caused by an integer overflow error in the "DCTStream::reset()" [xpdf/Stream.cc] method, which could be exploited by attackers to cause a heap overflow via a specially crafted PDF file.

The third issue is caused by a heap overflow error in the "CCITTFaxStream::lookChar()" [xpdf/Stream.cc] method, which could be exploited by attackers to execute arbitrary code by tricking a user into opening a PDF file containing a specially crafted "CCITTFaxDecode" filter.

Affected Products

Xpdf versions prior to 3.02pl2

Solution

Apply patch :
ftp://ftp.foolabs.com/pub/xpdf/xpdf-3.02pl2.patch

References

http://www.vupen.com/english/advisories/2007/3774
http://freshmeat.net/projects/xpdf/?branch_id=12080&release_id=265311
http://secunia.com/secunia_research/2007-88/advisory

Credits

Vulnerabilities reported by Alin Rad Pop (Secunia Research).

ChangeLog

2007-11-08 : Initial release
2007-11-08 : Updated Solution

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