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.

rsyslog ignored the $AllowedSender configuration directive, therefore accepting log messages from anyone (CVE-2008-5617).

Additionally imudp logged a message when unauthorized senders tried to send to it, therefore allowing attackers to flood the log CVE-2008-5618).

Security fixes for CVE-2008-5617 and CVE-2008-5618, detailed in:
http://www.rsyslog.com/Article322.phtml http://secunia.com/Advisories/32857/

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
40305	openSUSE Security Update : rsyslog (rsyslog-392)	Nessus	SuSE Local Security Checks	high
40304	openSUSE Security Update : rsyslog (rsyslog-367)	Nessus	SuSE Local Security Checks	high
38098	Fedora 10 : rsyslog-3.21.9-1.fc10 (2008-11476)	Nessus	Fedora Local Security Checks	high
35232	Fedora 9 : rsyslog-3.20.2-2.fc9 (2008-11538)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2008-5618

high

Tenable Plugins

high

high

high

high