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HTTP 1.1 Chunked Encoding Transfer

 
Signature ID: 5245/0
Original Release:S127
Release:S448 (download)
Original Release Date:2004 November 19
Latest Release Date:2009 November 13
Default Enabled:False
Default Retired:True
Alarm Severity:Medium
Fidelity:100 

Description

This signature fires when HTTP 1.1 chunked encoding transfer activity is detected.

Recommended Filter

Exclude valid client systems as sources. Exclude non-vulnerable web servers as destinations.

Benign Triggers

Chucked encoding transfers are an irregularly used feature of the HTTP 1.1 protocol, which is exclusively requested by the client. Numerous security problems have been identified with web servers which fail to properly implement chunked encoding. Traffic firing this alarm should be examined to validate that it is legitimate.

IntelliShield Alerts

IntelliShield ID Headline VersionCVSS ScoreLast Published
549Malicious Transfer-encoding Header Methods Issue12000 May 01 16:00 GMT
3588Microsoft IIS Multiple Vulnerabilities42002 June 12 23:12 GMT
9192RSA Authentication Agent for Web Buffer Overflow Vulnerability22005 October 19 19:40 GMT
17992Microsoft Windows HTTP Services Integer Underflow Arbitrary Code Execution Vulnerability69.3/6.92009 May 14 12:28 GMT

Download

To download this and other IPS update files, please go to Cisco Secure Software Download.

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