#VU83527 Security features bypass in opendkim - CVE-2022-48521

Vulnerability identifier: #VU83527

Vulnerability risk: Medium

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

CVE-ID: CVE-2022-48521

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
opendkim
Other software / Other software solutions

Vendor: www.opendkim.org

Description

The vulnerability allows a remote attacker to bypass implemented security measures.

The vulnerability exists due to improper tracking of ordinal numbers when removing fake Authentication-Results header fields. A remote attacker can create a specially crafted e-mail message with a fake sender address that will be treated as a message having a valid DKIM signature by software that relies on Authentication-Results from OpenDKIM.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

opendkim: 2.2.2 - 2.11.0 Beta2

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External links
https://github.com/trusteddomainproject/OpenDKIM/issues/148
https://bugzilla.redhat.com/show_bug.cgi?id=2223352
https://bugzilla.redhat.com/show_bug.cgi?id=2223270

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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.