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K
zdiAbdelhamid Naceri (halov)ZDI-21-424
HistoryApr 21, 2021 - 12:00 a.m.

Microsoft Windows AppX Deployment Service Directory Junction Denial-of-Service Vulnerability

2021-04-2100:00:00
Abdelhamid Naceri (halov)
www.zerodayinitiative.com
24

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

3.6 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:N/I:P/A:P

0.001 Low

EPSS

Percentile

45.2%

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 directory junction, an attacker can abuse the service to delete the contents of a chosen directory. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

3.6 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:N/I:P/A:P

0.001 Low

EPSS

Percentile

45.2%