Advisory Details

August 8th, 2017

Microsoft Windows CLFS Driver Buffer Overflow Privilege Escalation Vulnerability

ZDI-17-635
ZDI-CAN-4773

CVE ID CVE-2017-8624
CVSS SCORE 6.9, (AV:L/AC:M/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS


This vulnerability allows local attackers to escalate privileges on vulnerable installations of Microsoft Windows. 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 Common Log File System (CLFS) driver. A crafted call to this driver can trigger an overflow of a buffer. An attacker can leverage this vulnerability to escalate privilege to the level of SYSTEM.

VENDOR RESPONSE Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8624
DISCLOSURE TIMELINE
  • 2017-05-05 - Vulnerability reported to vendor
  • 2017-08-08 - Coordinated public release of advisory
CREDIT Jaanus Kp
Clarified Security
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