ZDI-06-009: Mozilla Firefox Tag Parsing Code Execution Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-06-009.html April 14, 2006 -- CVE ID: CVE-2006-0749 -- Affected Vendor: Mozilla -- Affected Products: Firefox 1.0 through 1.0.7 Thunderbird 1.5 through 1.5.0.1 Thunderbird 1.0 through 1.0.7 SeaMonkey 1.0 Mozilla Suite 1.7 through 1.7.12 -- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability since December 13, 2005 by Digital Vaccine protection filter ID 3977. For further product information on the TippingPoint IPS: http://www.tippingpoint.com -- Vulnerability Details: This vulnerability allows attackers to execute arbitrary code on vulnerable installations of the Mozilla/Firefox web browser and Thunderbird e-mail client. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious e-mail. The specific flaw exists within nsHTMLContentSink.cpp, during the parsing of HTML tags as they appear in a specific order. The flaw results in a memory corruption that leads to an attacker controlled function pointer dereference from the stack and eventually execution of arbitrary code. -- Vendor Response: Mozilla has issued an update to correct this vulnerability. Further details are available at: http://www.mozilla.org/security/announce/2006/mfsa2006-18.html -- Disclosure Timeline: 2005.12.13 - Vulnerability reported to vendor 2005.12.13 - Digital Vaccine released to TippingPoint customers 2006.04.14 - Coordinated public release of advisory -- Credit: This vulnerability was discovered by an anonymous researcher. -- About the Zero Day Initiative (ZDI): Established by TippingPoint, a division of 3Com, The Zero Day Initiative (ZDI) represents a best-of-breed model for rewarding security researchers for responsibly disclosing discovered vulnerabilities. Researchers interested in getting paid for their security research through the ZDI can find more information and sign-up at: http://www.zerodayinitiative.com The ZDI is unique in how the acquired vulnerability information is used. 3Com does not re-sell the vulnerability details or any exploit code. Instead, upon notifying the affected product vendor, 3Com provides its customers with zero day protection through its intrusion prevention technology. Explicit details regarding the specifics of the vulnerability are not exposed to any parties until an official vendor patch is publicly available. Furthermore, with the altruistic aim of helping to secure a broader user base, 3Com provides this vulnerability information confidentially to security vendors (including competitors) who have a vulnerability protection or mitigation product.