2009-3523 | avast Antivirus Professional input validation (BID-36888 / 42261)

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.

8.4 $0-$5k 0.04

A vulnerability classified as critical has been found in avast Antivirus Professional up to 4.7.1042 (Anti-Malware Software). This affects an unknown function. The manipulation with an unknown input leads to a privilege escalation vulnerability. CWE is classifying the issue as CWE-20. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was disclosed 10/01/2009 (Website). The advisory is shared at ntinternals.org. This vulnerability is uniquely identified as CVE-2009-3523 since 10/01/2009. An attack has to be approached locally. No form of authentication is needed for exploitation. Technical details are unknown but a public exploit is available.

It is declared as proof-of-concept. The exploit is shared for download at securityfocus.com. The vulnerability scanner Nessus provides a plugin with the ID 42261 (avast! Professional Edition Windows.

Upgrading to version 4.7.1043 eliminates this vulnerability.

The vulnerability is also documented in the databases at Vulnerability Center (SBV-23915) and Tenable (42261). The entries 50338 and 50336 are pretty similar.




VulDB Meta Base Score: 9.3
VulDB Meta Temp Score: 8.4

VulDB Base Score: 9.3
VulDB Temp Score: 8.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

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Vector Complexity Authentication Confidentiality Integrity Availability
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VulDB Base Score: 🔍
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VulDB Reliability: 🔍

NVD Base Score: 🔍

Class: Privilege escalation
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 42261
Nessus Name: avast! Professional Edition Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 801111
OpenVAS Name: avast! Multiple Vulnerabilities – Oct09 (Win)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Antivirus Professional 4.7.1043

09/24/2009 🔍
09/24/2009 +0 days 🔍
10/01/2009 +6 days 🔍
10/01/2009 +0 days 🔍
10/01/2009 +0 days 🔍
11/03/2009 +33 days 🔍
03/18/2015 +1961 days 🔍
08/23/2021 +2350 days 🔍Advisory: ntinternals.org
Status: Not defined
Confirmation: 🔍

CVE: CVE-2009-3523 (🔍)

Vulnerability Center: 23915 – Avast! Antivirus Prior to 4.8.1356 x27aavmKer4.sysx27 Driver Local Privilege Escalation Vulnerability, Medium
SecurityFocus: 36888 – Avast! Antivirus ‘aavmKer4.sys’ Driver Local Privilege Escalation Vulnerability

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

Created: 03/18/2015 15:15
Updated: 08/23/2021 13:11
Changes: (1) source_nessus_risk
Complete: 🔍


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