Microsoft Windows Installer Service Directory Junction Information Disclosure Vulnerability
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
