Advisory Details

September 16th, 2021

Microsoft Windows Installer Service Directory Junction Information Disclosure Vulnerability

ZDI-21-1103
ZDI-CAN-13768

CVE ID CVE-2021-36962
CVSS SCORE 5.5, (AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 Windows Installer Service. By creating a directory junction, an attacker can abuse the service to disclose the contents of arbitrary files. An attacker can leverage this vulnerability to disclose information in the context of SYSTEM.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36962
DISCLOSURE TIMELINE
  • 2021-06-04 - Vulnerability reported to vendor
  • 2021-09-16 - Coordinated public release of advisory
  • 2021-09-20 - Advisory Updated
CREDIT Abdelhamid Naceri
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