NULL pointer dereference in OpenDMARC - CVE-2021-34555
Published: December 20, 2021
Vulnerability identifier: #VU59058
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2021-34555
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
OpenDMARC
Fedora
opendmarc
Fedora
opendmarc
How to mitigate CVE-2021-34555
Install update from vendor's website.
OpenDMARC - update to 1.4.2
opendmarc - addressed in versions 1.4.1.1-2.fc35, 1.4.1.1-3.el7, 1.4.1.1-3.el8, 1.4.1.1-3.fc33, 1.4.1.1-3.fc34
opendmarc - addressed in versions 1.4.1.1-2.fc35, 1.4.1.1-3.el7, 1.4.1.1-3.el8, 1.4.1.1-3.fc33, 1.4.1.1-3.fc34
External References
- 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