Advisory Details

March 12th, 2020

Microsoft Windows AppX Deployment Service Link Resolution Denial-of-Service Vulnerability

ZDI-20-277
ZDI-CAN-9473

CVE ID CVE-2020-0776
CVSS SCORE 6.1, (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS

This vulnerability allows local attackers to create a denial-of-service condition 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 AppX Deployment Service. By creating a junction, an attacker can abuse the service to delete the contents of a chosen file or folder. An attacker can leverage this vulnerability to create a denial-of-service condition on the 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-2020-0776
DISCLOSURE TIMELINE
  • 2019-11-28 - Vulnerability reported to vendor
  • 2020-03-12 - Coordinated public release of advisory
CREDIT JeongOh Kyea(@kkokkokye) of THEORI
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