Snort mailing list archives
Detecting TCP Timestamp PAWS DoS from tracefile
From: "J.Smith" <lbalbalba () hotmail com>
Date: Sun, 7 Aug 2005 12:43:23 +0200
Hi.At our site, we have the impression that we might have been hit by the following issue :
Multiple Vendor TCP Timestamp PAWS Remote Denial Of Service Vulnerability http://www.securityfocus.com/bid/13676 TCP does not adequately validate segments before updating timestamp value http://www.kb.cert.org/vuls/id/637934In a nutshell, the issue manifests if an attacker transmits a sufficient TCP PAWS packet to a vulnerable computer. A large value is set by the attacker as the tcp packet timestamp. When the target computer processes this packet, the internal timer is updated to the large attacker supplied value. This causes all other valid packets that are received subsequent to an attack to be dropped as they are deemed to be too old, or invalid. This effectively 'stalls' the connection, which will deny service for a target connection.
Fortunately, we have a tracefile of some of the traffic that hit our site at the time. I was wondering how easy it would be to 'proof' that we did indeed experience this issue with the use of snort ? I did a quick scan of the snort ruleset database, but it appears that detection of this issue is not included in the snort database yet ?
Thanks, John Smith. ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- Detecting TCP Timestamp PAWS DoS from tracefile J.Smith (Aug 07)
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- Re: [Snort-devel] Detecting TCP Timestamp PAWS DoS from tracefile J.Smith (Aug 07)
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- Re: [Snort-devel] Detecting TCP Timestamp PAWS DoS from tracefile J.Smith (Aug 07)
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- Re: [Snort-devel] Detecting TCP Timestamp PAWS DoS from tracefile J.Smith (Aug 07)
- Re: [Snort-devel] Detecting TCP Timestamp PAWS DoS from tracefile J.Smith (Aug 07)
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