Avast Antivirus Professional up to 4.8.1350 memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Avast Antivirus Professional up to 4.8.1350. It has been declared as problematic. Affected by this vulnerability is an unknown functionality. Such manipulation leads to memory corruption. This vulnerability is documented as CVE-2009-3522. Additionally, an exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

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. CVE summarizes:

Stack-based buffer overflow in aswMon2.sys in avast! Home and Professional for Windows 4.8.1351, and possibly other versions before 4.8.1356, allows local users to cause a denial of service (system crash) and possibly gain privileges via a crafted IOCTL request to IOCTL 0xb2c80018.

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), Exploit-DB (10106), Tenable (42261), SecurityFocus (BID 36507†) and OSVDB (58402†). Entries connected to this vulnerability are available at VDB-3496, VDB-41806, VDB-50338 and VDB-50337. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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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: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Antivirus Professional 4.8.1351

Timelineinfo

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 🔍
09/23/2025 +3842 days 🔍

Sourcesinfo

Advisory: evilfingers.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2009-3522 (🔍)
GCVE (CVE): GCVE-0-2009-3522
GCVE (VulDB): GCVE-100-50336

OVAL: 🔍

X-Force: 53456
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
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
Vupen: ADV-2009-2761

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

Entryinfo

Created: 03/18/2015 15:15
Updated: 09/23/2025 07:23
Changes: 03/18/2015 15:15 (70), 09/15/2017 09:40 (20), 08/23/2021 12:58 (3), 09/23/2025 07:23 (15)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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