Mozilla Firefox and SeaMonkey contain a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.
The vulnerability is due to improper memory operations when processing web pages. An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to visit a web page designed to malicious crafted values to the vulnerable elements. If successful, the attacker could execute arbitrary code with the privileges of the user.
Exploit code is available.
Mozilla has confirmed this vulnerability and released updated software.
Indicators of Compromise
The following Mozilla products are vulnerable:
Mozilla Firefox versions prior to 3.6.17 and versions prior to 3.5.19
SeaMonkey versions prior to 2.0.14
The vulnerability is due to insecure memory operations that are performed by the affected software when handling the nsTreeRange object attribute. Due to this flaw, the software may improperly remove references to existing objects, leaving a dangling pointer that references the removed object.
An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to visit a web page designed to pass malicious values to the vulnerable object attribute. When processed, the website could trigger memory corruption that could allow the attacker to execute arbitrary code on the targeted system.
An attacker would likely use likely use social engineering techniques such as sending the malicious URL in an e-mail message, instant messaging, or other forms of communication. Use of these techniques is a prerequisite to exploit the vulnerability because it involves user interaction.
Available exploit samples report the ability to execute code on Windows XP and Windows 7 systems and even defeat address space layout randomization (ASLR) and Data Execution Prevention (DEP) protections.
Administrators are advised to apply the appropriate updates.
Users should verify that unsolicited links are safe to follow.
Administrators are advised to monitor affected systems.
Mozilla has released a security advisory at the following link: MFSA-2011-13
Red Hat Enterprise Linux Optional Productivity Applications
5 (IA-32, x86-64)
Red Hat Enterprise Linux Optional Productivity Applications EUS
5.6.z (IA-32, x86_64)
Red Hat Enterprise Linux Optional Productivity Applications Long Life
5.6 (IA-32, x86_64)
Red Hat Enterprise Linux Server
6 (IA-32, PPC, PPC 64, s390, s390x, x86_64)
Red Hat Enterprise Linux Workstation
4 (IA-32, IA-64, x86_64) | 6 (IA-32, x86_64)
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM
THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
FIXED SOFTWARE INFORMATION AND LINKS PROVIDED BY SUPPLIERS AND VENDORS ARE FOR REFERENCE ONLY. USERS SHOULD CONTACT THEIR SUPPLIER OR VENDOR FOR UPDATED SOFTWARE.
A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products
Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.