Advisory Details

August 13th, 2020

Microsoft Windows WalletService Race Condition Information Disclosure Vulnerability

ZDI-20-996
ZDI-CAN-11589

CVE ID CVE-2020-1556
CVSS SCORE 2.5, AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS

This vulnerability allows local 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 WalletService service. The issue results from the lack of proper locking when performing operations on an object, which can cause a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute code in the context of SYSTEM.

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-2020-1556
DISCLOSURE TIMELINE
  • 2020-08-05 - Vulnerability reported to vendor
  • 2020-08-13 - Coordinated public release of advisory
CREDIT Anonymous
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