GLSA 200702-12: CHMlib: User-assisted remote execution of arbitrary code

http://security.gentoo.org/

Severity:	normal
Title:	CHMlib: User-assisted remote execution of arbitrary code
Date:	02/27/2007
Bugs:	#163989
ID:	200702-12

Synopsis

A memory corruption vulnerability in CHMlib could lead to the remote execution of arbitrary code.

Background

CHMlib is a library for the MS CHM (Compressed HTML) file format plus extracting and HTTP server utils.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
dev-libs/chmlib	< 0.39	>= 0.39	All supported architectures

Description

When certain CHM files that contain tables and objects stored in pages are parsed by CHMlib, an unsanitized value is passed to the alloca() function resulting in a shift of the stack pointer to arbitrary memory locations.

Impact

An attacker could entice a user to open a specially crafted CHM file, resulting in the execution of arbitrary code with the permissions of the user viewing the file.

Workaround

There is no known workaround at this time.

Resolution

All CHMlib users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-libs/chmlib-0.39"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200702-12.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.