Vulnerability identifier: #VU69364

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-44640

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
heimdal
Server applications / Encryption software

Vendor: Heimdal Software

Description

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

The vulnerability exists due to a boundary error in ASN.1 codec in Heimdal. The ASN.1 compiler generates code that allows specially crafted DER encodings of CHOICEs to invoke the wrong free function on the decoded structure upon decode error. This is known to impact the Heimdal KDC, leading to an invalid free() of an address partly or wholly under the control of the attacker. A remote attacker can execute arbitrary code on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

heimdal: 7.0.1 - 7.7.0

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External links
http://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.