JunkBuster: Multiple vulnerabilities

Background

JunkBuster is a filtering HTTP proxy, designed to enhance privacy and remove unwanted content.

Description

James Ranson reported a vulnerability when JunkBuster is configured to run in single-threaded mode, an attacker can modify the referrer setting by getting a victim to request a specially crafted URL (CAN-2005-1108). Tavis Ormandy of the Gentoo Linux Security Audit Team identified a heap corruption issue in the filtering of URLs (CAN-2005-1109).

Impact

If JunkBuster has been configured to run in single-threaded mode, an attacker can disable or modify the filtering of Referrer: HTTP headers, potentially compromising the privacy of users. The heap corruption vulnerability could crash or disrupt the operation of the proxy, potentially executing arbitrary code.

Workaround

There is no known workaround at this time.

Resolution

All JunkBuster users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-proxy/junkbuster-2.0.2-r3"