Kingsoft WebShield KAVSafe.sys privilege escalation

webshield-kavsafe-privilege-escalation (58780)

High 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.
• SA39916: Kingsoft WebShield KAVSafe.sys IOCTL Handling Vulnerability

Platforms Affected:

• Kingsoft WebShield 3.5.1.2

Reported:

May 23, 2010

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