CVE-2019-16791

In postfix-mta-sts-resolver before 0.5.1, All users can receive incorrect response from daemon under rare conditions, rendering downgrade of effective STS policy.

Weakness

A protocol or its implementation supports interaction between multiple actors and allows those actors to negotiate which algorithm should be used as a protection mechanism such as encryption or authentication, but it does not select the strongest algorithm that is available to both parties.

Affected Software

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/220.html
• https://cwe.mitre.org/data/definitions/606.html
• https://cwe.mitre.org/data/definitions/620.html

References

• https://gist.github.com/Snawoot/b9da85d6b26dea5460673b29df1adc6b
• https://github.com/Snawoot/postfix-mta-sts-resolver/security/advisories/GHSA-h92m-42h4-82f6
• https://gist.github.com/Snawoot/b9da85d6b26dea5460673b29df1adc6b
• https://github.com/Snawoot/postfix-mta-sts-resolver/security/advisories/GHSA-h92m-42h4-82f6