avast! aswMon2.sys buffer overflow

avast-aswmon2-bo (53456) The risk level is classified as HighHigh Risk

Description:

avast! is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the aswMon2.sys driver. By sending a specially-crafted 0xB2C80018 IOCTL request, a local attacker could overflow a buffer and execute arbitrary code on the system with kernel privileges or cause the application to crash.

*CVSS:

Base Score: 4.6
  Access Vector: Local
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 3.6
  Exploitability: Proof-of-Concept
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Privileges

Remedy:

Upgrade to the latest version of avast! (4.8.1356 or later), available from the avast! Web site. See References.

References:

  • avast! Web site: avast!.
  • BugTraq Mialing List, Wed Sep 23 2009 - 11:24:30 CDT: Avast aswMon2.sys kernel memory corruption and Local Privilege Escalation.
  • Evilfingers Web site: Avast aswMon2.sys kernel memory corruption and Local Privilege Escalation.
  • BID-36507: Avast! Antivirus 'aswMon2.sys' Driver Local Privilege Escalation Vulnerability
  • CVE-2009-3522: 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.
  • OSVDB ID: 58402: avast! Home / Professional aswMon2.sys IOCTL Handling Memory Corruption Local Privilege Escalation
  • SA36858: avast! Home/Professional Multiple Vulnerabilities
  • SECTRACK ID: 1022940: avast! 'aswMon2.sys' IOCTL Memory Corruption Flaw May Let Local Users Gain Elevated Privileges

Platforms Affected:

  • Alwil avast! 4.8.1351 Home
  • Alwil avast! 4.8.1351 Professional

Reported:

Sep 23, 2009

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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