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zdiSteven Seeley (mr_me) of Source InciteZDI-21-829
HistoryJul 19, 2021 - 12:00 a.m.

Microsoft SharePoint CabUtility ExtractCab Directory Traversal Remote Code Execution Vulnerability

2021-07-1900:00:00
Steven Seeley (mr_me) of Source Incite
www.zerodayinitiative.com
82

7.1 High

CVSS3

Attack Vector

ADJACENT_NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

5.4 Medium

CVSS2

Access Vector

ADJACENT_NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.017 Low

EPSS

Percentile

87.6%

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Microsoft SharePoint. User interaction is required to exploit this vulnerability. The specific flaw exists within the parsing of CAB files. When handling filenames specified within a CAB file, the process does not properly validate a user-supplied path prior to using it in file operations. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of the service account.

7.1 High

CVSS3

Attack Vector

ADJACENT_NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

5.4 Medium

CVSS2

Access Vector

ADJACENT_NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.017 Low

EPSS

Percentile

87.6%