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

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.

Affected Packages

app-text/xpdf on all architectures
Affected versions <= 3.00-r7
Unaffected versions >= 3.00-r8
app-text/gpdf on all architectures
Affected versions < 2.8.2
Unaffected versions >= 2.8.2

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.

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

Release Date
January 21, 2005

Latest Revision
January 21, 2005: 01

Severity
normal

Exploitable
remote

Bugzilla entries