It was found that mailman did not sanitize the list name before passing it to certain MTAs. A local attacker could use this flaw to execute arbitrary code as the user running mailman. (CVE-2015-2775 __)
It was found that mailman stored private email messages in a world-readable directory. A local user could use this flaw to read private mailing list archives. (CVE-2002-0389 __)
Run yum update mailman to update your system.
i686: mailman-2.1.15-21.20.amzn1.i686 mailman-debuginfo-2.1.15-21.20.amzn1.i686 src: mailman-2.1.15-21.20.amzn1.src x86_64: mailman-debuginfo-2.1.15-21.20.amzn1.x86_64 mailman-2.1.15-21.20.amzn1.x86_64