spamassassin: Malicious rule configuration files can be configured to run system commands (CVE-2020-1946)

In Apache SpamAssassin before 3.4.5, malicious rule configuration (.cf) files can be configured to run system commands without any output or errors. With this, exploits can be injected in a number of scenarios. In addition to upgrading to SA version 3.4.5, users should only use update channels or 3rd party .cf files from trusted places.

References:

• https://www.openwall.com/lists/oss-security/2021/03/24/3
• https://s.apache.org/3r1wh

Affected branches:

• master (959e525e)
• 3.13-stable
• 3.12-stable
• 3.11-stable
• 3.10-stable