Patches Released For Firefox and Thunderbird

The release of Firefox 7 is important because the new version features better memory management and is the first step in Mozilla’s long term plan to make the browser more resource friendly.

Nevertheless, users who upgrade to it will also benefit from improved security as this release fixes six critical and two moderate severity security vulnerabilities.

Four of the critical patches are shared with Thunderbird 7 and address a use-after-free condition with OGG headers, an exploitable crash in the YARR regular expression library, a code installation quirk involving the Enter key and multiple memory hazards.

A moderate severity patch that provides defence against multiple Location headers caused by CRLF injection attacks is also common to both products.

In addition to these patches Firefox 7 also contains fixes for two critical and one moderate severity vulnerabilities, with one of them resulting in a potentially exploitable WebGL crash.

It’s worth pointing out that Microsoft previously motivated its decision to not include support for WebGL in Internet Explorer by saying that the 3D graphics library opens a large attack surface.

So far several serious vulnerabilities have been identified and patched in WebGL, which partially supports Microsoft’s assessment, but the library’s supporters claim this is no different than with other technologies.

Firefox 7 also updates Websocket, a protocol disabled in the past because of security issues, to version 8, which is no longer vulnerable to known attacks.

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Adobe Patches Security Holes in Flash

Adobe has released a security update for Flash Player in order to address several critical vulnerabilities, including one that is being exploited in the wild.

The Flash Player 10.3.183.10 for Windows, Mac and Linux, and Flash Player 10.3.186.7 for Android, contain patches for six security flaws.

One of them is a cross-site scripting (XSS) weakness that can be exploited to execute rogue actions on behalf of web sites or webmail providers if victims click on maliciously-crafted links.

“There are reports that this issue is being exploited in the wild in active targeted attacks designed to trick the user into clicking on a malicious link delivered in an email message,” Adobe warns in its security advisory.

XSS vulnerabilities are the result of improper user input validation and allow attackers to execute rogue code in the context of the current web site. For example, they can be leveraged to extract session cookies or load rogue forms into legitimate pages, which makes for very credible phishing attacks.

Adobe credits Google for reporting this cross-site scripting vulnerability, which is identified as CVE-2011-2444. This means it might have been detected in attacks against Gmail users.

Two other patched vulnerabilities allow for arbitrary code execution and are located in the AVM stack. One of them can also lead to a denial of service condition. Two remote code execution logic errors and a Flash Player security control bypass have also been addressed.

Users should deploy the new update as soon as possible because browser plug-ins like Java, Adobe Reader or Flash Player are amongst the most attacked pieces of software one can have on a computer. However, unlike Adobe Reader X (10.0) which features sandboxing technology, Flash Player doesn’t have any anti-exploitation mechanism built-in.

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