-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ZDI-12-184 : Microsoft Excel Feature11/Feature12 Record Trusted Counter Remote Code Execution Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-12-184 November 15, 2012 - -- CVE ID: CVE-2012-2543 - -- CVSS: 7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P - -- Affected Vendors: Microsoft - -- Affected Products: Microsoft Office Excel - -- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability by Digital Vaccine protection filter ID 12612. For further product information on the TippingPoint IPS, visit: http://www.tippingpoint.com - -- Vulnerability Details: This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Excel. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within Excel's parsing of Feature11/Feature12 records. The process trusts a supplied counter value without validating its size and proceeds to use it within a copy operation to the stack. An attacker can abuse this to execute arbitrary code under the context of the user running Excel. - -- Vendor Response: Microsoft has issued an update to correct this vulnerability. More details can be found at: http://technet.microsoft.com/en-us/security/bulletin/ms12-076 - -- Disclosure Timeline: 2012-07-24 - Vulnerability reported to vendor 2012-11-15 - Coordinated public release of advisory - -- Credit: This vulnerability was discovered by: * Anonymous - -- About the Zero Day Initiative (ZDI): Established by TippingPoint, 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. TippingPoint does not re-sell the vulnerability details or any exploit code. Instead, upon notifying the affected product vendor, TippingPoint 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, TippingPoint provides this vulnerability information confidentially to security vendors (including competitors) who have a vulnerability protection or mitigation product. Our vulnerability disclosure policy is available online at: http://www.zerodayinitiative.com/advisories/disclosure_policy/ Follow the ZDI on Twitter: http://twitter.com/thezdi -----BEGIN PGP SIGNATURE----- Version: PGP Desktop 10.2.0 (Build 1950) Charset: utf-8 wsBVAwUBUKT6gFVtgMGTo1scAQKIEgf/ZGKs7rUvbu90dJA5rkK+/8c6y+/ORgyM a77S1rb5oN1FT5iK6g/B1hWYSc1c4ePDSmnp9ikoSV6YJs+TUfGN8vLDuCuF6YkG BvKLQzrGEtGjB3waypehRU9gjRaa52Gmn61DootEwDt+fwwsHAPE48EOo5UwI1mk Yet8SlBFCmp+RUEUZqMswOfclEjGvULn4rE9nlNOGkhFYfPQBzBq6Juj3msCxs81 +HHmV2rDmL37ElMxdEw99b4qGV4thaZTgHsvRVZGLMUZcmnXOnrVGiZQCkJZMuUu PFA+toXswVYCrjPaLHkdfVDi4TzrnPgxffwJuvghrn/qT/WhCF8o9Q== =n1W3 -----END PGP SIGNATURE-----