Kingsoft WebShield KAVSafe.sys privilege escalation

webshield-kavsafe-privilege-escalation (58780) The risk level is classified as HighHigh Risk

Description:

Kingsoft WebShield could allow a local attacker to gain elevated privileges on the system, caused by an error in the KAVSafe.sys driver. By sending a specially-crafted 830020D4h IOCTL request, a local attacker could exploit this vulnerability to corrupt kernel memory and execute arbitrary code on the system with SYSTEM level privileges.

*CVSS:

Base Score: 7.2
  Access Vector: Local
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Complete
  Integrity Impact: Complete
  Availability Impact: Complete
 
Temporal Score: 5.6
  Exploitability: Proof-of-Concept
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Privileges

Remedy:

Upgrade to the latest version of WebShield (2010.5.21.727 or later), available from the Kingsoft Web site. See References.

References:

  • Kingsoft Web site: WebShield.
  • Offensive Security Exploit Database [05-23-2010]: Kingsoft WebShield KAVSafe.sys <= 2010.4.14.609(2010.5.23) Kernel Mode Local Priv. Escalation .
  • BID-40342: Kingsoft Webshield 'KAVSafe.sys' Driver IOCTL Handling Local Privilege Escalation Vulnerability
  • CVE-2010-2031: KAVSafe.sys 2010.4.14.609 and earlier, as used in Kingsoft Webshield 3.5.1.2 and earlier, allows local users to overwrite arbitrary kernel memory via a crafted request to IOCTL 0x830020d4 on the KAVSafe device.
  • OSVDB ID: 64833: Kingsoft WebShield KAVSafe.sys IOCTL Handling Memory Corruption
  • SA39916: Kingsoft WebShield KAVSafe.sys IOCTL Handling Vulnerability

Platforms Affected:

  • Kingsoft WebShield 3.5.1.2

Reported:

May 23, 2010

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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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