Advisory Details

August 13th, 2020

Microsoft Windows Print Spooler Directory Junction Privilege Escalation Vulnerability

ZDI-20-995
ZDI-CAN-11136

CVE ID CVE-2020-1337
CVSS SCORE 7.8, AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges 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 Print Spooler service. By creating a directory junction, an attacker can abuse the Print Spooler service to create an arbitrary file. An attacker can leverage this vulnerability 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-2020-1337
DISCLOSURE TIMELINE
  • 2020-06-02 - Vulnerability reported to vendor
  • 2020-08-13 - Coordinated public release of advisory
CREDIT Anonymous
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