postfix-mta-sts-resolver Algorithm Downgrade vulnerability

Incorrect query parsing

Impact

All users of versions prior to 0.5.1 can receive incorrect response from daemon under rare conditions, rendering downgrade of effective STS policy.

Patches

Problem has been patched in version 0.5.1

Workarounds

Users may remediate this vulnerability without upgrading by applying these patches to older suppoorted versions.

For more information

If you have any questions or comments about this advisory:

• Open an issue in postfix-mta-sts-resolver repo
• Email me at vladislav at vm-0 dot com