#VU59058 NULL pointer dereference in OpenDMARC - CVE-2021-34555

Vulnerability identifier: #VU59058

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-2021-34555

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

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

Vendor: Trusted Domain Project

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 when parsing a multi-value From header field. A remote attacker can send a specially crafted message and perform a denial of service attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenDMARC: 1.4.1 - 1.4.1.1

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External links
https://github.com/trusteddomainproject/OpenDMARC/issues/179
https://github.com/trusteddomainproject/OpenDMARC/pull/178
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VZHZD4WZDYRBB2XVW2EQ4DQ2KYMAGPUO/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2MAT4ZSWPQ5SUTMYCXRXI5SMTWL4AG7E/
https://github.com/trusteddomainproject/OpenDMARC/releases/tag/rel-opendmarc-1-4-2

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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.