Oriol Carreras discovered that syslog-ng, a next generation logging daemon can be tricked into dereferencing a NULL pointer through malformed timestamps, which can lead to denial of service and the disguise of an subsequent attack, which would otherwise be logged. The old stable distribution (sarge) is not affected. For the stable distribution (etch), this problem has been fixed in version 2.0.0-1etch1. For the unstable distribution (sid), this problem has been fixed in version 2.0.6-1. We recommend that you upgrade your syslog-ng package.