#VU69362 Out-of-bounds read in heimdal - CVE-2022-41916

Vulnerability identifier: #VU69362

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-2022-41916

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
heimdal
Server applications / Encryption software

Vendor: Heimdal Software

Description

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

The vulnerability exists due to a boundary condition in Heimdal's PKI certificate validation library. A remote attacker can pass a specially crafted certificate to the affected application, trigger an out-of-bounds read error and perform a denial of service (DoS) attack.

The vulnerability affects KDC (via PKINIT), kinit (via PKINIT), as well as any third-party applications using Heimdal's libhx509.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

heimdal: 0.5 - 7.7.0

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External links
https://github.com/heimdal/heimdal/security/advisories/GHSA-mgqr-gvh6-23cx
https://github.com/heimdal/heimdal/releases/tag/heimdal-7.7.1

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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.