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HistoryMay 07, 2012 - 12:00 a.m.

(RHSA-2012:0542) Moderate: httpd security and bug fix update






The Apache HTTP Server (“httpd”) is the namesake project of The Apache
Software Foundation.

It was discovered that the Apache HTTP Server did not properly validate the
request URI for proxied requests. In certain configurations, if a reverse
proxy used the ProxyPassMatch directive, or if it used the RewriteRule
directive with the proxy flag, a remote attacker could make the proxy
connect to an arbitrary server, possibly disclosing sensitive information
from internal web servers not directly accessible to the attacker.

It was discovered that mod_proxy_ajp incorrectly returned an “Internal
Server Error” response when processing certain malformed HTTP requests,
which caused the back-end server to be marked as failed in configurations
where mod_proxy was used in load balancer mode. A remote attacker could
cause mod_proxy to not send requests to back-end AJP (Apache JServ
Protocol) servers for the retry timeout period or until all back-end
servers were marked as failed. (CVE-2011-3348)

The httpd server included the full HTTP header line in the default error
page generated when receiving an excessively long or malformed header.
Malicious JavaScript running in the server’s domain context could use this
flaw to gain access to httpOnly cookies. (CVE-2012-0053)

An integer overflow flaw, leading to a heap-based buffer overflow, was
found in the way httpd performed substitutions in regular expressions. An
attacker able to set certain httpd settings, such as a user permitted to
override the httpd configuration for a specific directory using a
“.htaccess” file, could use this flaw to crash the httpd child process or,
possibly, execute arbitrary code with the privileges of the “apache” user.

A NULL pointer dereference flaw was found in the httpd mod_log_config
module. In configurations where cookie logging is enabled, a remote
attacker could use this flaw to crash the httpd child process via an HTTP
request with a malformed Cookie header. (CVE-2012-0021)

A flaw was found in the way httpd handled child process status information.
A malicious program running with httpd child process privileges (such as a
PHP or CGI script) could use this flaw to cause the parent httpd process to
crash during httpd service shutdown. (CVE-2012-0031)

Red Hat would like to thank Context Information Security for reporting the
CVE-2011-3368 issue.

This update also fixes the following bug:

  • The fix for CVE-2011-3192 provided by the RHSA-2011:1329 update
    introduced a regression in the way httpd handled certain Range HTTP header
    values. This update corrects this regression. (BZ#749071)

All users of JBoss Enterprise Web Server 1.0.2 should upgrade to these
updated packages, which contain backported patches to correct these issues.
After installing the updated packages, users must restart the httpd
service for the update to take effect.