SB2023112821 - Signature validation bypass in OpenDKIM

Description

This security bulletin contains information about 1 vulnerability.

1) Security features bypass (CVE-ID: CVE-2022-48521)

CWE-ID: CWE-254 - Security Features

CVSSv4: 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

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.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• 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