GLSA 200501-28: Xpdf, GPdf: Stack overflow in Decrypt::makeFileKey2

http://security.gentoo.org/

Severity:	normal
Title:	Xpdf, GPdf: Stack overflow in Decrypt::makeFileKey2
Date:	01/21/2005
Bugs:	#77888, #78128
ID:	200501-28

Synopsis

A stack overflow was discovered in Xpdf, potentially resulting in the execution of arbitrary code. GPdf includes Xpdf code and therefore is vulnerable to the same issue.

Background

Xpdf is an open source viewer for Portable Document Format (PDF) files. GPdf is a Gnome-based PDF viewer that includes some Xpdf code.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
app-text/xpdf	<= 3.00-r7	>= 3.00-r8	All supported architectures
app-text/gpdf	< 2.8.2	>= 2.8.2	All supported architectures

Description

iDEFENSE reports that the Decrypt::makeFileKey2 function in Xpdf's Decrypt.cc insufficiently checks boundaries when processing /Encrypt /Length tags in PDF files.

Impact

An attacker could entice an user to open a specially-crafted PDF file which would trigger a stack overflow, potentially resulting in execution of arbitrary code with the rights of the user running Xpdf or GPdf.

Workaround

There is no known workaround at this time.

Resolution

All Xpdf users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-text/xpdf-3.00-r8"

All GPdf users should also upgrade to the latest version:


    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-text/gpdf-2.8.2"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200501-28.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.