Kaspersky Anti-Virus Kl1.sys privilege escalation

kaspersky-kl1-privilege-escalation (54309) The risk level is classified as HighHigh Risk


Kaspersky Anti-Virus could allow a local attacker to gain elevated privileges, caused by a NULL pointer dereference in kl1.sys.v. An attacker could exploit this vulnerability via a specially-crafted IOCTL 0x0022c008 call, an attacker could exploit this vulnerability to execute arbitrary code with elevated privileges or cause the kernel to crash.


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


Gain Privileges


Upgrade to the latest version of Kaspersky Anti-Virus ( or later), available from the Kaspersky Lab Web site. See References.


  • BugTraq Mailing List, Tue Nov 17 2009: Kaspersky Anti-Virus 2010 <= pointer dereference vulnerability.
  • Kaspersky Lab Web site: Antivirus Software: Kaspersky Lab - Protection Against Malware and Cybercrime.
  • BID-37044: Kaspersky Anti-Virus 'kl1.sys' Driver Local Privilege Escalation Vulnerability
  • CVE-2009-4114: kl1.sys in Kaspersky Anti-Virus 2010, and possibly other versions before, does not properly validate input to IOCTL 0x0022c008, which allows local users to cause a denial of service (system crash) via IOCTL requests using crafted kernel addresses that trigger memory corruption, possibly related to klavemu.kdl.
  • OSVDB ID: 60207: Kaspersky Anti-Virus 2010 kl1.sys IOCTL Handling Local DoS
  • SA37398: Kaspersky Anti-Virus 2010 klavemu.kdl Denial of Service Vulnerability
  • SECTRACK ID: 1023198: Kaspersky Anti-Virus 'kl1.sys' IOCTL Error Lets Local Users Deny Service

Platforms Affected:

  • Kaspersky Anti-Virus 2010


Nov 17, 2009

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