Firefox Update Fixes Flaws

Tuesday, February 16, 2016 @ 03:02 PM gHale

Mozilla updated the standard and Extended Support Release (ESR) versions of Firefox last week to address critical vulnerabilities.

The updates come after Cisco’s Talos team found vulnerabilities in the Libgraphite library, used for font processing in Linux, OpenOffice, Firefox and other applications. Researchers discovered four vulnerabilities an attacker could leverage for arbitrary code execution and denial-of-service (DoS) attacks.

Chrome Expands Safe Browsing
Password Request Warning on Firefox
Security Feature Added to Firefox
Firefox 43: 21 Security Issues Fixed

In the case of Firefox, the vulnerabilities affect Graphite 2 version 1.2.4, used in Firefox 42 and earlier, and Firefox ESR 38.x prior to version 38.6.1.

“To exploit these vulnerabilities, an attacker simply needs the user to run a Graphite-enabled application that renders a page using a specially crafted font that triggers one of these vulnerabilities,” Cisco’s Yves Younan said in a blog post.

Mozilla updated the Graphite 2 library to version 1.3.5 in Firefox 43 in December, and in Firefox ESR 38.6.1 last week.

Firefox ESR is a version of the Web browser intended for organizations that need extended support for mass deployments, such as businesses, schools and governments. New features and enhancements only became available in this version several development cycles after the standard Firefox.

Mozilla’s advisory covering Graphite 2 vulnerabilities focuses on CVE-2016-1523, a heap-based buffer overflow that can end up exploited via a malicious font. The company credited researcher Holger Fuhrmannek for reporting the flaw.

Mozilla has also updated the standard version of Firefox to 44.0.2 in order to address a critical same-origin policy violation reported by Jason Pang of OneSignal.

“[Pang] reported that service workers intercept responses to plugin network requests made through the browser. Plugins which make security decisions based on the content of network requests can have these decisions subverted if a service worker forges responses to those requests,” Mozilla said in an advisory.