GLSA 200407-11: wv: Buffer overflow vulnerability

http://security.gentoo.org/

Severity:	normal
Title:	wv: Buffer overflow vulnerability
Date:	07/14/2004
Bugs:	#56595
ID:	200407-11

Synopsis

A buffer overflow vulnerability exists in the wv library that can allow an attacker to execute arbitrary code with the privileges of the user running the vulnerable application.

Background

The wv library allows access to MS Word files. It can parse Word files and allow other applications, such as abiword, to import those files into their native formats.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
app-text/wv	< 1.0.0-r1	>= 1.0.0-r1	All supported architectures

Description

A use of strcat without proper bounds checking leads to an exploitable buffer overflow. The vulnerable code is executed when wv encounters an unrecognized token, so a specially crafted file, loaded in wv, can trigger the vulnerable code and execute it's own arbitrary code. This exploit is only possible when the user loads the document into HTML view mode.

Impact

By inducing a user into running wv on a special file, an attacker can execute arbitrary code with the permissions of the user running the vulnerable program.

Workaround

Users should not view untrusted documents with wvHtml or applications using wv. When loading an untrusted document in an application using the wv library, make sure HTML view is disabled.

Resolution

All users should upgrade to the latest available version.

    # emerge sync
    
    # emerge -pv ">=app-text/wv-1.0.0-r1"
    # emerge ">=app-text/wv-1.0.0-r1"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200407-11.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.