Signature validation bypass in OpenDMARC



| Updated: 2021-04-30
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-16378
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 OpenDMARC
Universal components / Libraries / Libraries used by multiple products

Vendor Trusted Domain Project

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU21256

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-2019-16378

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in OpenDMARC implementation when processing emails with multiple "From:" addresses in a DKIM signed multi-from message. A remote attacker can create a specially crafted email message and bypass signature validation.

Successful exploitation of this vulnerability may allow an attacker to bypass implemented anti-spam measures.

Mitigation

Install update from vendor's website.

Vulnerable software versions

OpenDMARC: 1.3.2 - 1.3.3

CPE2.3 External links

https://www.openwall.com/lists/oss-security/2019/09/17/2
https://github.com/trusteddomainproject/OpenDMARC/pull/48
https://seclists.org/bugtraq/2019/Sep/36
https://www.openwall.com/lists/oss-security/2019/09/11/8
https://github.com/trusteddomainproject/OpenDMARC/blob/master/SECURITY/CVE-2019-16378


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.



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