A denial of service flaw was reported in the upstream Rsyslog syslogd support. A non-permitted sender could send a message to the imudp plugin, which would reply by emitting a message, each time such an request was made. This could allow an attacker to cause a DoS (excessive disk space consummation). References: http://www.rsyslog.com/Topic4.phtml Upstream patch against 3.20.2 (v3-stable) version: http://git.adiscon.com/?p=rsyslog.git;a=commitdiff;h=afdccceefa30306cf720a27efd5a29bcc5a916c9
This issue does NOT affect the version of the Rsyslog package, as shipped with Red Hat Enterprise Linux 5. This issue affects the versions of the Rsyslog package, as shipped with Fedora releases of 9, 10 and devel (Fedora release of 8 is not affected).
This issue affects versions 3.20.1 and 3.21.8. The current versions in Fedora 9, 10 and devel are 3.20.2, 3.21.9 and 3.21.9, respectively. The referenced patch should be against version 3.20.1.
rsyslog-3.20.2-2.fc9 has been submitted as an update for Fedora 9. http://admin.fedoraproject.org/updates/rsyslog-3.20.2-2.fc9
CVE id CVE-2008-5618 was assigned to this issue: 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-3.20.2-2.fc9 has been pushed to the Fedora 9 stable repository. If problems still persist, please make note of it in this bug report.
rsyslog-3.21.9-1.fc10 has been pushed to the Fedora 10 stable repository. If problems still persist, please make note of it in this bug report.
This issue was addressed in: Fedora: https://admin.fedoraproject.org/updates/F10/FEDORA-2008-11476 https://admin.fedoraproject.org/updates/F9/FEDORA-2008-11538