Advisory Details

December 15th, 2016

Avira Free Antivirus ssmdrv Kernel Driver Memory Corruption Privilege Escalation Vulnerability

ZDI-16-670
ZDI-CAN-3809

CVE ID
CVSS SCORE 6.9, (AV:L/AC:M/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS Avira
AFFECTED PRODUCTS Free Antivirus
VULNERABILITY DETAILS


This vulnerability allows attackers to escalate privileges on vulnerable installations of Avira Free Antivirus. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the processing of IOCTL 0x00220010 by the ssmdrv driver. The issue lies in failure to properly validate user-supplied data which can result in a memory corruption condition within the kernel. An attacker can leverage this vulnerability to execute arbitrary code under the context of the kernel.

VENDOR RESPONSE Avira states:


The reported vulnerability should be fixed now with the version 15.0.22.54.


DISCLOSURE TIMELINE
  • 2016-06-14 - Vulnerability reported to vendor
  • 2016-12-15 - Coordinated public release of advisory
CREDIT bee13oy of CloverSec Labs
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