#VU79701 NULL pointer dereference in libyang - CVE-2023-26916

Vulnerability identifier: #VU79701

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-2023-26916

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libyang
Universal components / Libraries / Libraries used by multiple products

Vendor: CESNET

Description

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

The vulnerability exists due to a NULL pointer dereference error within the lys_parse_mem() function in lys_parse_mem.c. A remote attacker can perform a denial of service attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libyang: 2.0.164 - 2.1.4

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External links
https://github.com/CESNET/libyang/issues/1979
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6NQZHCJG3SBMFOQNIPRZGKDK3ARHLTTB/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U2VWGCMYKQH4BTFEHX5VYEXXOPIKKFHS/

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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.