Vulnerabilities / Threats
2/5/2010
06:08 PM
Connect Directly
Google+
LinkedIn
Twitter
RSS
E-Mail
50%
50%

Mozilla Removes Two Malicious Firefox Add-Ons

About 4,600 Windows users appear to have downloaded the infected software.

Mozilla on Friday said that it had removed two Firefox add-ons from its Web site because they installed malware.

"Two add-ons in the experimental section of addons.mozilla.org were found to be containing malware," Mozilla said on its security blog. "These were not originally detected with the anti-malware scanning tools that we have been using. We have since increased the number of scanning tools, and will be taking additional steps to minimize the risk of further incidents."

AMO, Mozilla's add-on management group, posted a notice about the malicious add-ons on Thursday.

The malicious add-ons have been identified as version 4.0 of Sothink Web Video Downloader and all versions of Master Filer. According to AMO's blog post, Sothink Web Video Downloader 4.0 included malware known as Win32.LdPinch.gen, while Master Filer included malware known as Win32.Bifrose.32.Bifrose Trojan.

Launching Firefox with either of these add-ons installed on a Windows computer is likely to lead to an infection. Removing the add-on does not remove the trojan software, however. Antivirus software that recognizes the malware is necessary for removal. According to Mozilla, the following antivirus apps will work: Antiy-AVL, Avast, AVG, GData, Ikarus, K7AntiVirus, McAfee, Norman, and VBA32.

Last May, security researcher Duarte Silva created a proof-of-concept malicious add-on, or "maladon," to highlight problems in Firefox's add-on security model.

Mozilla has made some security improvements since then, such as locking down Firefox's components directory. But the discovery of infected add-ons on Mozillla's AMO site suggests that additional action is necessary.

A Mozilla spokesperson wasn't immediately available for comment.

Master Filer was downloaded approximately 600 times between September 2009 and January 2010. Version 4.0 of Sothink Web Video Downloader was downloaded approximately 4,000 times between February 2008 and May 2008. AMO's blog post says that versions of Sothink greater than 4.0 are not infected. The latest version, 5.7, is not available through AMO's site, but can be found at Sothink's Web site.

In July, Mozilla launched a program to help add-on developers solicit contributions for the add-ons they post on the AMO site.

Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
White Papers
Cartoon
Current Issue
Dark Reading, September 16, 2014
Malicious software is morphing to be more targeted, stealthy, and destructive. Are you prepared to stop it?
Flash Poll
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2014-2886
Published: 2014-09-18
GKSu 2.0.2, when sudo-mode is not enabled, uses " (double quote) characters in a gksu-run-helper argument, which allows attackers to execute arbitrary commands in certain situations involving an untrusted substring within this argument, as demonstrated by an untrusted filename encountered during ins...

CVE-2014-4352
Published: 2014-09-18
Address Book in Apple iOS before 8 relies on the hardware UID for its encryption key, which makes it easier for physically proximate attackers to obtain sensitive information by obtaining this UID.

CVE-2014-4353
Published: 2014-09-18
Race condition in iMessage in Apple iOS before 8 allows attackers to obtain sensitive information by leveraging the presence of an attachment after the deletion of its parent (1) iMessage or (2) MMS.

CVE-2014-4354
Published: 2014-09-18
Apple iOS before 8 enables Bluetooth during all upgrade actions, which makes it easier for remote attackers to bypass intended access restrictions via a Bluetooth session.

CVE-2014-4356
Published: 2014-09-18
Apple iOS before 8 does not follow the intended configuration setting for text-message preview on the lock screen, which allows physically proximate attackers to obtain sensitive information by reading this screen.

Best of the Web
Dark Reading Radio