Sophos Anti-Virus Document Scan denial of service

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3	$0-$5k	0.00

A vulnerability, which was classified as problematic, was found in Sophos Anti-Virus (Anti-Malware Software) (the affected version unknown). Affected is an unknown part of the component Document Scan. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability.

The weakness was published 11/05/2012 by Tavis Ormandy (@taviso) with Google Security Team as sophailv2.pdf as confirmed document (Full-Disclosure). The advisory is available at lock.cmpxchg8b.com. The public release has been coordinated with the vendor. 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 exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are unknown but a public exploit is available.

A public exploit has been developed by Tavis Ormandy (@taviso) and been published immediately after the advisory. The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. 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 $5k-$25k.

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 vulnerability database at Exploit-DB (22509). Further details are available at nakedsecurity.sophos.com. Similar entries are available at 6868, 6865, 6866 and 6867.

Productinfo

Type

Anti-Malware Software

Vendor

Sophos

Name

Anti-Virus

License

commercial

CPE 2.3info

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CPE 2.2info

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CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.9
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

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

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Timelineinfo

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 🔍
11/07/2012 +1 days 🔍
11/07/2012 +0 days 🔍
05/01/2018 +2001 days 🔍

Sourcesinfo

Vendor: sophos.com

Advisory: sophailv2.pdf
Researcher: Tavis Ormandy (@taviso)
Organization: Google Security Team
Status: Confirmed
Coordinated: 🔍
SecurityTracker: 1027725
SecurityFocus: 56401
Secunia: 51156 - Sophos Anti-Virus Multiple Vulnerabilities, Highly Critical
OSVDB: 87056

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

Entryinfo

Created: 11/07/2012 09:33
Updated: 05/01/2018 12:34
Changes: 11/07/2012 09:33 (75), 05/01/2018 12:34 (3)
Complete: 🔍
Cache ID: 3:381:103