RHSA-2007:0747 - Security Advisory

Topic

Updated httpd packages that fix a security issue, various bugs, and add
enhancements are now available for Red Hat Enterprise Linux 4.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

Description

The Apache HTTP Server is a popular and freely-available Web server.

A flaw was found in the Apache HTTP Server mod_proxy module. On sites where
a reverse proxy is configured, a remote attacker could send a carefully
crafted request that would cause the Apache child process handling that
request to crash. On sites where a forward proxy is configured, an attacker
could cause a similar crash if a user could be persuaded to visit a
malicious site using the proxy. This could lead to a denial of service if
using a threaded Multi-Processing Module. (CVE-2007-3847)

As well, these updated packages fix the following bugs:

• the default "/etc/logrotate.d/httpd" script incorrectly invoked the kill

command, instead of using the "/sbin/service httpd restart" command. If you
configured the httpd PID to be in a location other than
"/var/run/httpd.pid", the httpd logs failed to be rotated. This has been
resolved in these updated packages.

• Set-Cookie headers with a status code of 3xx are not forwarded to

clients when the "ProxyErrorOverride" directive is enabled. These
responses are overridden at the proxy. Only the responses with status
codes of 4xx and 5xx are overridden in these updated packages.

• mod_proxy did not correctly handle percent-encoded characters (ie %20)

when configured as a reverse proxy.

• invalid HTTP status codes could be logged if output filters returned

errors.

• the "ProxyTimeout" directive was not inherited across virtual host

definitions.

• in some cases the Content-Length header was dropped from HEAD responses.

This resulted in certain sites not working correctly with mod_proxy, such
as www.windowsupdate.com.

This update adds the following enhancements:

• a new configuration option has been added, "ServerTokens Full-Release",

which adds the package release to the server version string, which is
returned in the "Server" response header.

• a new module has been added, mod_version, which allows configuration

files to be written containing sections, which are evaluated only if the
version of httpd used matches a specified condition.

Users of httpd are advised to upgrade to these updated packages, which
resolve these issues and add these enhancements.

Solution

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

Affected Products

• Red Hat Enterprise Linux Server 4 x86_64
• Red Hat Enterprise Linux Server 4 ia64
• Red Hat Enterprise Linux Server 4 i386
• Red Hat Enterprise Linux Workstation 4 x86_64
• Red Hat Enterprise Linux Workstation 4 ia64
• Red Hat Enterprise Linux Workstation 4 i386
• Red Hat Enterprise Linux Desktop 4 x86_64
• Red Hat Enterprise Linux Desktop 4 i386
• Red Hat Enterprise Linux for IBM z Systems 4 s390x
• Red Hat Enterprise Linux for IBM z Systems 4 s390
• Red Hat Enterprise Linux for Power, big endian 4 ppc

Fixes

• BZ - 173467 - windowsupdate.microsoft.com does not work with mod_proxy
• BZ - 197915 - %>s incorrectly logs status code as 70007 - default handler returns output filter apr_status_t value
• BZ - 233254 - mod_proxy not handling percent chars in URLs correctly
• BZ - 240022 - Mod_proxy_http ProxyErrorOverride eating cookies
• BZ - 241407 - logrotate.d/httpd postrotate must use initscripts
• BZ - 242920 - Reverse Proxy Unexpected Timeout
• BZ - 248696 - Identify httpd version to configuration
• BZ - 250731 - CVE-2007-3847 httpd out of bounds read

CVEs

• CVE-2007-3847

References

• http://www.redhat.com/security/updates/classification/#moderate