Advisory Details

January 15th, 2020

Microsoft Windows CLFS Driver Integer Overflow Information Disclosure Vulnerability

ZDI-20-122
ZDI-CAN-9421

CVE ID CVE-2020-0639
CVSS SCORE 8.4, (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS

This vulnerability allows attackers to disclose sensitive information on affected 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 CLFS driver. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before reading from memory. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute code in the context of the kernel.

ADDITIONAL DETAILS 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-2020-0639
DISCLOSURE TIMELINE
  • 2019-10-01 - Vulnerability reported to vendor
  • 2020-01-15 - Coordinated public release of advisory
CREDIT Anonymous
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