CVE-2008-5617: Due to a coding error in the modularization effort, the $AllowedSender directive is no longer honored but silently accepted. As such, rsyslog-based access control via $AllowedSender is not working and messages from every sender will be accepted by rsyslog. Most importantly, this could lead to misleading log entries or a remote DoS, by a malicious sender simply flooding the system logs with messages until the system runs out of disk space.
CVE-2008-5618: imudp in rsyslog 4.x before 4.1.2, 3.21 before 3.21.9 beta, and 3.20 before 3.20.2 generates a message even when it is sent by an unauthorized sender, which allows remote attackers to cause a denial of service (disk consumption) via a large number of spurious messages.