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zdiFffvrZDI-24-194
HistoryFeb 23, 2024 - 12:00 a.m.

Linux Kernel ksmbd Mech Token Out-Of-Bounds Read Information Disclosure Vulnerability

2024-02-2300:00:00
fffvr
www.zerodayinitiative.com
12
linux kernel
ksmbd
mech token
out-of-bounds read
information disclosure
vulnerability
remote attackers
authentication
user-supplied data
allocated buffer
arbitrary code

7.1 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

HIGH

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

6.5 Medium

AI Score

Confidence

High

3.2 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

PARTIAL

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

0.0004 Low

EPSS

Percentile

15.9%

This vulnerability allows remote attackers to disclose sensitive information on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability. However, only systems with ksmbd enabled are vulnerable. The specific flaw exists within the handling of SMB2 Mech Tokens. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the kernel.

7.1 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

HIGH

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

6.5 Medium

AI Score

Confidence

High

3.2 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

PARTIAL

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

0.0004 Low

EPSS

Percentile

15.9%