Vulnerability identifier: #VU70482

Vulnerability risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-47942

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor:

Description

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in set_ntacl_dacl, related to use of SMB2_QUERY_INFO_HE after a malformed SMB2_SET_INFO_HE command. A remote user can send specially crafted data to the ksmbd daemon, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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External links
http://github.com/torvalds/linux/commit/8f0541186e9ad1b62accc9519cc2b7a7240272a7
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8f0541186e9ad1b62accc9519cc2b7a7240272a7
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19.2
http://www.openwall.com/lists/oss-security/2022/12/23/10
http://www.zerodayinitiative.com/advisories/ZDI-22-1688/

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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.