Information disclosure in Linux kernel ksmbd

1) Out-of-bounds read

EUVDB-ID: #VU70485

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-47940

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in smb2_write in fs/ksmbd/smb2pdu.c. A remote user can trigger an out-of-bounds read error and read contents of memory on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 5.18.18

External links

http://github.com/torvalds/linux/commit/158a66b245739e15858de42c0ba60fcf3de9b8e6
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=158a66b245739e15858de42c0ba60fcf3de9b8e6
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.18
http://www.openwall.com/lists/oss-security/2022/12/23/10
http://www.zerodayinitiative.com/advisories/ZDI-22-1691/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.