The default configuration of syslogd in the Linux sysklogd package does not enable the -x (disable name lookups) option, which allows remote attackers to cause a denial of service (traffic amplification) via messages with spoofed source IP addresses.
CVSS Severity (version 2.0):
Impact Subscore: 6.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service
Official Statement from Mandriva (07/20/2006)
Mandriva does not enable the -r option in syslogd per default, which prevents syslogd from listening for remote events. The -x option is also described in /etc/sysconfig/syslog for those who wish to enable the -r option.
Official Statement from Red Hat (12/06/2006)
Red Hat does not consider this to be a security issue. Enabling the -r option is not suggested without the -x option which is clearly documented in the /etc/sysconfig/syslog configuration file.
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20060402 RE: DoS-ing sysklogd?
Advisory; Patch Information
20060331 DoS-ing sysklogd?
Vulnerable software and versions