Snort is an open-source tool that tries to detect and prevent attacks on systems and has also been included in up to 45 retail firewall products, plus many more open-source software.  CNET has an article which describes a buffer overflow flaw in it, which hasn't been exploited ... yet.   Keep your eyes open.

"A buffer overflow flaw exists in a Snort sensor designed to detect Back Orifice, an older

remote-controlled Trojan horse, Snort developer Sourcefire said in an advisory on Tuesday. An

attacker could commandeer a system running Snort 2.4.0 and higher by sending a specially crafted

network packet, it warned.

Sourcefire's warning prompted security provider Symantec to raise its ThreatCon global threat

index to Level 2, which means an outbreak is expected."

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