Avast Antivirus Professional up to 4.8.1350 memory corruption

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.

A vulnerability was found in Avast Antivirus Professional up to 4.8.1350 (Anti-Malware Software). It has been rated as critical. Affected by this issue is some unknown processing. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability.

The bug was discovered 09/13/2009. The weakness was released 09/23/2009 (Website). The advisory is shared for download at evilfingers.com. This vulnerability is handled as CVE-2009-3522 since 10/01/2009. The exploitation is known to be easy. The attack needs to be approached locally. No form of authentication is required for exploitation. Technical details are unknown but a public exploit is available.

A public exploit has been developed in ANSI C. The exploit is available at securityfocus.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 10 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 42261 (avast! Professional Edition < 4.8.1356 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows.

Upgrading to version 4.8.1351 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (53456) and Tenable (42261). Entries connected to this vulnerability are available at 3496, 41806, 50338 and 50337.







CPE 2.3info

CPE 2.2info


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: 🔍



VulDB Base Score: 🔍
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NVD Base Score: 🔍


Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: Yes
Remote: No

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 42261
Nessus Name: avast! Professional Edition < 4.8.1356 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

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

Threat Intelligenceinfo

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


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Antivirus Professional 4.8.1351


09/13/2009 🔍
09/23/2009 +10 days 🔍
09/23/2009 +0 days 🔍
09/23/2009 +0 days 🔍
09/24/2009 +1 days 🔍
09/24/2009 +0 days 🔍
09/24/2009 +0 days 🔍
10/01/2009 +6 days 🔍
10/01/2009 +0 days 🔍
10/27/2009 +26 days 🔍
11/03/2009 +7 days 🔍
03/18/2015 +1961 days 🔍
08/23/2021 +2350 days 🔍


Advisory: evilfingers.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2009-3522 (🔍)

X-Force: 53456
SecurityTracker: 1022940 - avast! 'aswMon2.sys' IOCTL Memory Corruption Flaw May Let Local Users Gain Elevated Privileges
Vulnerability Center: 23916 - Avast! Antivirus 4.8.1351.0 \x27aswMon2.sys\x27 Driver Local Privilege Escalation Vulnerability, High
SecurityFocus: 36507 - Avast! Antivirus 'aswMon2.sys' Driver Local Privilege Escalation Vulnerability
Secunia: 36858 - avast! Home/Professional Multiple Vulnerabilities, Less Critical
OSVDB: 58402 - avast! Home / Professional aswMon2.sys IOCTL Handling Memory Corruption Local Privilege Escalation
Vupen: ADV-2009-2761

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


Created: 03/18/2015 03:15 PM
Updated: 08/23/2021 12:58 PM
Changes: 03/18/2015 03:15 PM (70), 09/15/2017 09:40 AM (20), 08/23/2021 12:58 PM (3)
Complete: 🔍


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