Sophos Anti-Virus CAB Unpacking Code Execution Vulnerability

2006.05.12
Risk: High
Local: No
Remote: Yes
CWE: CWE-Other


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

ZDI-06-012: Sophos Anti-Virus CAB Unpacking Code Execution Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-06-013.html May 8, 2006 -- CVE ID: CVE-2006-0994 -- Affected Vendor: Sophos Plc. -- Affected Products: Sophos Anti-Virus for Windows, Mac OS, Unix, Linux, NetWare, OS/2, OpenVMS and DOS Sophos Anti-Virus Small Business Editions for Windows and Mac OS PureMessage for Windows/Exchange and UNIX PureMessage Small Business Edition MailMonitor for Windows, Notes/Domino and Exchange -- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability since March 14, 2006 by Digital Vaccine protection filter IDs 4185, 4189. For further product information on the TippingPoint IPS: http://www.tippingpoint.com -- Vulnerability Details: This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Sophos AntiVirus. Authentication is not required to exploit this vulnerability. The specific flaw exists within the unpacking of Microsoft Cabinet files that contain invalid folder count values within the CAB header. Parsing of a specially crafted cabinet file can lead to an exploitable heap corruption. This vulnerability is only exposed when cabinet file inspection is explicitly enabled. -- Vendor Response: Sophos has addressed this issue in the latest versions of their virus protection software. Further details are available at: http://www.sophos.com/support/knowledgebase/article/4934.html -- Disclosure Timeline: 2006.03.14 - Digital Vaccine released to TippingPoint customers 2006.03.20 - Vulnerability reported to vendor 2006.05.08 - 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.


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