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Apache "Space Headers" Denial of Service Vulnerability
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Secunia Advisory:
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SA13045
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Release Date:
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2004-11-03
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Last Update:
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2005-02-08
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Popularity:
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19,412 views
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Critical:
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Less critical
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Impact:
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DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Apache 2.0.x
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| | CVE reference: | CVE-2004-0942
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Description:
Chintan Trivedi has discovered a vulnerability in Apache, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an error in the parsing routine for headers with a large amount of spaces. This can be exploited by sending some specially crafted requests with a large amount of overly long headers containing only spaces.
Successful exploitation can cause the server to become unreachable and use a large amount of CPU resources, but will regain functionality once the attack stops.
The vulnerability has been confirmed on version 2.0.52 running Linux. Other versions may also be affected.
Solution:
Update to version 2.0.53.
http://httpd.apache.org/download.cgi
Provided and/or discovered by:
Chintan Trivedi
Changelog:
2004-11-04: Added CVE reference and updated the "Solution" section.
2005-02-08: Updated "Solution" section.
Original Advisory:
http://www.apache.org/dist/httpd/CHANGES_2.0.53
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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