Apache HTTP Server vulnerable to DoS race condition in the handling of short-lived connections

Overview

A race condition exists in Apache 2 HTTP Server that may cause a denial-of-service condition on some platforms.

Description

Apache HTTP Server versions 2.0.48 and prior contain a race condition in the handling of short-lived connections. According to the Apache anouncement, when using multiple listening sockets, a short-lived connection on a rarely-used socket may cause the child process to hold the accept mutex, blocking new connections from being served until another connection uses the socket.

This vulnerability does not affect Apache 2.x servers running on FreeBSD or Linux.

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Impact

A denial-of-service situation may occur due the race condition until another connection is made the the socket.

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Solution

This problem is resolved in Apache HTTP Server 2.0.49.

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Vendor Information

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Apache Software Foundation __ Affected

Updated: March 24, 2004

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Please see, <http://www.apache.org/dist/httpd/Announcement2.html&gt;

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23132110 Feedback>).

Sun Microsystems Inc. __ Affected

Updated: August 25, 2004

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Please see, <http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert/57628&gt;.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23132110 Feedback>).

CVSS Metrics

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References

• <http://www.apache.org/dist/httpd/Announcement2.html&gt;
• <http://secunia.com/advisories/11170/&gt;

Acknowledgements

Thanks to Apache Software Foundation for reporting this vulnerability.

This document was written by Jason A Rafail.

Other Information

CVE IDs:	CVE-2004-0174
Severity Metric:	3.38 Date Public: