#VU80481 Resource exhaustion in Linux kernel - CVE-2023-32247

Vulnerability identifier: #VU80481

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-32247

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

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

Vendor: Linux Foundation

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to ksmbd does not properly control consumption of internal resources when handling SMB2_SESSION_SETUP commands. A remote attacker can send specially crafted data to the server during session setup, trigger memory exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=2219803
https://github.com/torvalds/linux/commit/ea174a91893956450510945a0c5d1a10b5323656
https://www.zerodayinitiative.com/advisories/ZDI-23-695/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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