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

Type securityvulns
Reporter Securityvulns
Modified 2010-06-14T00:00:00


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