Vulnerabilities / Threats
8/17/2010
02:18 PM
Connect Directly
Google+
LinkedIn
Twitter
RSS
E-Mail
50%
50%

Firefox Flaw Facilitates Deception

Security companies see risk in a browser bug, but Mozilla's director of Firefox says users are safe.




Slideshow: 10 Killer Mac Applications
(click for larger image and for full photo gallery)
Firefox engineers are busy trying to fix a bug that prevents the browser from flagging Web addresses that have been disguised.

Disguising or obfuscating a Web address (URL) is a tactic employed by malware distributors to increase the likelihood of enticing potential victims to malicious Web sites.

Modern browsers commonly attempt to see through obfuscation techniques to identify unsafe Web addresses. But Firefox misses obfuscated URLs inside of iFrames, blocks of HTML code that add content to a Web page from a third party's server.

"[A] bug has been noticed in all versions of Firefox [that] fails to generate an alert when an obfuscated URL is being placed in iFrames," noted security company Armorize in a blog post on Monday. "In certain cases, [the vulnerability] can be used effectively in spreading malware and stealing sensitive information."

Armorize has posted a generic proof-of-concept exploit to demonstrate the flaw.

URL obfuscation and the misuse of iFrames are not new techniques, but they can nevertheless be combined effectively to dupe potential victims, observes Kaspersky Lab's security researcher Dennis Fisher in a blog post.

"Web-based attacks have been employing various forms of URL obfuscation for years now, and iFrames are a favorite of attackers because of their ability to perform malicious actions in the background of a victim's Web session," he wrote. "The new bug in Firefox could allow an attacker to combine these two techniques to prevent the browser from warning the victim that a URL has been modified, removing a key protection mechanism from the equation."

Mozilla's bug tracking system, Bugzilla, has an entry for the vulnerability, 570658, which indicates that a fix is underway.

Johnathan Nightingale, Mozilla's director of Firefox development, downplayed the significance of the issue.

"The concern expressed in the bug is that a page could be constructed with an embedded iFrame that uses a confusing URL," he said in an e-mailed statement. "Most users don't look at the HTML source of the pages they are loading, which is the only way you'd encounter this URL. We do not anticipate this bug would cause user confusion or deception. Firefox ships with built-in phishing and malware protection that warns users if they are attempting to visit a dangerous URL."

Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
Partner Perspectives
What's This?
In a digital world inundated with advanced security threats, Intel Security seeks to transform how we live and work to keep our information secure. Through hardware and software development, Intel Security delivers robust solutions that integrate security into every layer of every digital device. In combining the security expertise of McAfee with the innovation, performance, and trust of Intel, this vision becomes a reality.

As we rely on technology to enhance our everyday and business life, we must too consider the security of the intellectual property and confidential data that is housed on these devices. As we increase the number of devices we use, we increase the number of gateways and opportunity for security threats. Intel Security takes the “security connected” approach to ensure that every device is secure, and that all security solutions are seamlessly integrated.
Featured Writers
White Papers
Cartoon
Current Issue
Dark Reading's October Tech Digest
Fast data analysis can stymie attacks and strengthen enterprise security. Does your team have the data smarts?
Flash Poll
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2014-3409
Published: 2014-10-25
The Ethernet Connectivity Fault Management (CFM) handling feature in Cisco IOS 12.2(33)SRE9a and earlier and IOS XE 3.13S and earlier allows remote attackers to cause a denial of service (device reload) via malformed CFM packets, aka Bug ID CSCuq93406.

CVE-2014-4620
Published: 2014-10-25
The EMC NetWorker Module for MEDITECH (aka NMMEDI) 3.0 build 87 through 90, when EMC RecoverPoint and Plink are used, stores cleartext RecoverPoint Appliance credentials in nsrmedisv.raw log files, which allows local users to obtain sensitive information by reading these files.

CVE-2014-4623
Published: 2014-10-25
EMC Avamar 6.0.x, 6.1.x, and 7.0.x in Avamar Data Store (ADS) GEN4(S) and Avamar Virtual Edition (AVE), when Password Hardening before 2.0.0.4 is enabled, uses UNIX DES crypt for password hashing, which makes it easier for context-dependent attackers to obtain cleartext passwords via a brute-force a...

CVE-2014-4624
Published: 2014-10-25
EMC Avamar Data Store (ADS) and Avamar Virtual Edition (AVE) 6.x and 7.0.x through 7.0.2-43 do not require authentication for Java API calls, which allows remote attackers to discover grid MCUser and GSAN passwords via a crafted call.

CVE-2014-6151
Published: 2014-10-25
CRLF injection vulnerability in IBM Tivoli Integrated Portal (TIP) 2.2.x allows remote authenticated users to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.

Best of the Web
Dark Reading Radio
Archived Dark Reading Radio
Follow Dark Reading editors into the field as they talk with noted experts from the security world.