Sophos Anti-Virus Visual Basic 6 File memoryRDWR integer coercion

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CVSS Meta Temp Score
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CTI Interest Score
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9.0$0-$5k0.00

A vulnerability was found in Sophos Anti-Virus (Anti-Malware Software) (unknown version) and classified as very critical. This issue affects the function memoryRDWR of the component Visual Basic 6 File Handler. Using CWE to declare the problem leads to CWE-192. Impacted is confidentiality, integrity, and availability.

The weakness was presented 11/05/2012 by Tavis Ormandy (@taviso) with Google Security Team as sophailv2.pdf as confirmed document (Full-Disclosure). It is possible to read the advisory at lock.cmpxchg8b.com. The public release was coordinated in cooperation with Sophos. As demonstrated in the initial paper, installing Sophos Antivirus exposes machines to considerable risk. If Sophos do not urgently improve their security posture, their continued deployment causes significant risk to global networks and infrastructure. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/15/2018).

A public exploit has been developed by Tavis Ormandy (@taviso) and been published immediately after the advisory. It is declared as proof-of-concept. The exploit is available at exploit-db.com. The vulnerability was handled as a non-public zero-day exploit for at least 42 days. During that time the estimated underground price was around $25k-$100k.

Applying a patch is able to eliminate this problem. A possible mitigation has been published even before and not after the disclosure of the vulnerability. In response to early access to the initial report, Sophos did allocate some resources to resolve the issues discussed, however they were cearly ill-equipped to handle the output of one co-operative, non-adversarial security researcher. A sophisticated state-sponsored or highly motivated attacker could devastate the entire Sophos user base with ease.

The vulnerability is also documented in the databases at X-Force (79813), SecurityTracker (ID 1027725) and Exploit-DB (22509). nakedsecurity.sophos.com is providing further details. See 6868, 6865, 6866 and 6870 for similar entries.

Productinfoedit

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CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.0

VulDB Base Score: 10.0
VulDB Temp Score: 9.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2infoedit

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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VulDB Reliability: 🔍

Exploitinginfoedit

Class: Unknown
CWE: CWE-192
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Tavis Ormandy (@taviso)
Download: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍

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Exploit-DB: 🔍

Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfoedit

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exploit Delay Time: 🔍

Patch: lock.cmpxchg8b.com

Timelineinfoedit

09/10/2012 🔍
10/05/2012 +25 days 🔍
10/22/2012 +17 days 🔍
11/05/2012 +14 days 🔍
11/05/2012 +0 days 🔍
11/05/2012 +0 days 🔍
11/05/2012 +0 days 🔍
11/06/2012 +1 days 🔍
11/06/2012 +0 days 🔍
11/07/2012 +1 days 🔍
11/07/2012 +0 days 🔍
04/15/2018 +1985 days 🔍

Sourcesinfoedit

Vendor: https://www.sophos.com/

Advisory: sophailv2.pdf
Researcher: Tavis Ormandy (@taviso)
Organization: Google Security Team
Status: Confirmed
Coordinated: 🔍
X-Force: 79813, High Risk
SecurityTracker: 1027725
SecurityFocus: 56401
Secunia: 51156 - Sophos Anti-Virus Multiple Vulnerabilities, Highly Critical
OSVDB: 87059

scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍
See also: 🔍

Entryinfoedit

Created: 11/07/2012 09:33 AM
Updated: 04/15/2018 09:18 AM
Changes: (3) exploit_date source_secunia_date source_exploitdb_date
Complete: 🔍

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