#VU84353 Out-of-bounds read in Linux kernel - CVE-2023-39197

Vulnerability identifier: #VU84353

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-39197

CWE-ID: CWE-125

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 gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the Netfilter Connection Tracking (conntrack) in the Linux kernel in the nf_conntrack_dccp_packet() function in net/netfilter/nf_conntrack_proto_dccp.c. A remote attacker can send specially crafted DCCP packets to the system, 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 6.5, 6.5

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External links
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ff0a3a7d52ff7282dbd183e7fc29a1fe386b0c30
https://www.zerodayinitiative.com/advisories/ZDI-24-995/

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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.