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Advisory: Range header DoS vulnerability Apache HTTPD 1.3/2.x (CVE-2011-3192) -> IBM HTTP Server too!

  08/25/11 10:18, by dennisvr, Categories: Administration, IBM, Websphere, security, Sametime
Go read this, and apply the fixes. Your IBM HTTP server with the Websphere servers is just a rebranded Apache.

Example:

D:\IBM\bin>Apache.exe -v
Server version: IBM_HTTP_Server/6.0.2.29 Apache/2.0.47

(see update below)




Excerpt below:

          Apache HTTPD Security ADVISORY
          ==============================

Title:    Range header DoS vulnerability Apache HTTPD 1.3/2.x

CVE:      CVE-2011-3192: 
Date:     20110824 1600Z
Product:  Apache HTTPD Web Server
Versions: Apache 1.3 all versions, Apache 2 all versions

Description:
============

A denial of service vulnerability has been found in the way the multiple 
overlapping ranges are handled by the Apache HTTPD server:

     http://seclists.org/fulldisclosure/2011/Aug/175 

An attack tool is circulating in the wild. Active use of this tools has 
been observed.

The attack can be done remotely and with a modest number of requests can 
cause very significant memory and CPU usage on the server. 

The default Apache HTTPD installation is vulnerable.

There is currently no patch/new version of Apache HTTPD which fixes this 
vulnerability. This advisory will be updated when a long term fix 
is available. 

A full fix is expected in the next 48 hours. 


Update: The fix reportedly working for 2.0 and 2.2 doesn't work on 2.0 as the syntax is different. Apply the following:

# Drop the Range header when more than 5 ranges.
# CVE-2011-3192
SetEnvIf Range (,.*?){5,} bad-range=1
RequestHeader unset Range

# optional logging.
CustomLog logs/range-CVE-2011-3192.log common env=bad-range

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