[advisory] httpd Timeout detection flaw (mod_proxy_http) CVE-2010-2068

From: William A. Rowe Jr. <wrowe@apache.org>
To: bugtraq@securityfocus.com
Subject: [advisory] httpd Timeout detection flaw (mod_proxy_http) CVE-2010-2068

Vulnerability; httpd Timeout detection flaw (mod_proxy_http) CVE-2010-2068

Classification; important


    A timeout detection flaw in the httpd mod_proxy_http module causes
    proxied response to be sent as the response to a different request,
    and potentially served to a different client, from the HTTP proxy
    pool worker pipeline.

    This may represent a confidential data revealing flaw.

    This affects only Netware, Windows or OS2 builds of httpd version
    2.2.9 through 2.2.15, 2.3.4-alpha and 2.3.5-alpha, when the proxy
    worker pools have been enabled.  Earlier 2.2, 2.0 and 1.3 releases
    were not affected.


    We would like to thank Loren Anderson for the thorough research
    and reporting of this flaw.


    Apply any one of the following mitigations to avert the possibility
    of confidential information disclosure.

    * Do not load mod_proxy_http.

    * Do not configure/enable any http proxy worker pools with ProxySet
      or ProxyPass optional arguments.

    * The straightforward workaround to disable mod_proxy_http's reuse
      of backend connection pipelines is to set the following global

        SetEnv proxy-nokeepalive 1

    * Replace mod_proxy_http.so with a patched version, for source code
      see http://www.apache.org/dist/httpd/patches/apply_to_2.2.15/ or
      http://www.apache.org/dist/httpd/patches/apply_to_2.3.5/ and for
      binaries see the http://www.apache.org/dist/httpd/binaries/ tree
      for win32 or netware, as appropriate.

    * Upgrade to Apache httpd 2.2.16 or higher, once released.  There
      is no tentative release date scheduled.

Update Released; 11th June 2010

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