CHMlib: User-assisted remote execution of arbitrary code

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200702-12 / CHMlib
Release Date	February 27, 2007
Latest Revision	February 27, 2007: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-doc/chmlib	< 0.39	>= 0.39	All supported architectures

Related bugreports: #163989

Synopsis

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

2. Impact Information

Background

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

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.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All CHMlib users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-doc/chmlib-0.39"

4. References

Updated February 27, 2007

Summary: This is a Gentoo Linux Security Advisory

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