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Date: Tue, 6 Jan 2015 21:42:20 +1300
From: Matthew Daley <>
Subject: CVE request / advisory: Apache Traffic Server 5.0.0 - 5.1.1


I'd like to request a CVE ID for this issue. It was found in Apache
Traffic Server (, an open-source
caching proxy webserver.

This is the first such request but the issue has been semi-public for
a few weeks now; this message serves as an advisory as well. (Note
this probably needs a CVE-2014-* ID)

Affected software: Apache Traffic Server
Description: Receiving a HTTP TRACE request containing a
"Max-Forwards" header with a value of "0" will cause the
traffic_server process to crash with an assertion failure, even in
release builds.

The parent process, traffic_manager, will restart the traffic_server
process when it sees that it has crashed. However, it takes several
seconds before the new process is ready to handle requests, during
which the server appears unresponsive to the outside world. Also,
traffic_manager will queue incoming requests until the new process is
ready to handle them. These queued requests might consist of more of
the same request that caused the traffic_server process to crash in
the first place. This allows a remote attacker to perform an effective
DoS of the server with very little resources by simply sending the
crashing request repeatedly.

Affected versions: 5.0.0 - 5.1.1 (5.x.x series before 5.1.2)
Fixed version: 5.1.2
Bug entry:
Release notes:
Reported by: Matthew Daley

Please let me know if you need any further information.


- Matthew Daley

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