Rule: -- Sid: 1768 -- Summary: This event is generated when an attempt is made to overflow a buffer in HTTP header field handler of Microsoft Internet Information Server (IIS) versions 4.0, 5.0, and 5.1. -- Impact: Denial of Service, arbitrary code execution. Full administrative control is possible. -- Detailed Information: A vulnerability exists in HTTP header process in ASP.DLL , a specially crafted packet sent to this processor will allow an attacker to disrupt the ISS service or run any arbitrary commands with the privileges of the ASP ISAPI extension. -- Affected Systems: Microsoft Internet Information Server 4.0 Microsoft Internet Information Services 5.0 Microsoft Internet Information Services 5.1 -- Attack Scenarios: A remote attacker first probes the version of ISS server then ,could attempt overflow one of the HTTP header field buffers and execute arbitrary code on the system. -- Ease of Attack: Simple. -- False Positives: None known. -- False Negatives: None known. -- Corrective Action: Apply the appropriate vendor supplied patch. Upgrade to the latest non-affected version of the software. -- Contributors: Sourcefire Research Team Brian Caswell <bmc@sourcefire.com> Nigel Houghton <nigel.houghton@sourcefire.com> Snort documentation contributed by Nawapong Nakjang (tony@ksc.net, tonie@thai.com) -- Additional References: Microsoft: http://www.microsoft.com/technet/security/bulletin/MS02-018.asp CERT: http://www.cert.org/advisories/CA-2002-09.html --
