Authentication Bypass by Spoofing in OpenDMARC - CVE-2019-20790
Published: April 30, 2021
Vulnerability identifier: #VU52767
CSH Severity: Medium
CVSSv4.0: 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-2019-20790
CWE-ID: CWE-290
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
OpenDMARC
OpenDMARC
Software vendor:
Trusted Domain Project
Trusted Domain Project
Description
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists in OpenDMARC when used with pypolicyd-spf 2.0.2 when processing headers added by previous SPF filters. A remote attacker can bypass SPF and DMARC authentication in situations where the HELO field is inconsistent with the MAIL FROM field.
Remediation
Install updates from vendor's website.
External links
- https://bugs.launchpad.net/pypolicyd-spf/+bug/1838816
- https://sourceforge.net/p/opendmarc/tickets/235/
- https://www.usenix.org/system/files/sec20fall_chen-jianjun_prepub_0.pdf
- https://github.com/trusteddomainproject/OpenDMARC/releases/tag/rel-opendmarc-1-4-1
- https://github.com/trusteddomainproject/OpenDMARC/blob/master/SECURITY/CVE-2019-20790