Sigurnosni nedostaci programskog paketa httpd

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Red Hat Security Advisory

Synopsis: Low: httpd security, bug fix, and enhancement update
Advisory ID: RHSA-2015:0325-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-0325.html
Issue date: 2015-03-05
CVE Names: CVE-2013-5704 CVE-2014-3581
=====================================================================

1. Summary:

Updated httpd packages that fix two security issues, several bugs, and add
various enhancements are for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Low security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client Optional (v. 7) – noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) – noarch, x86_64
Red Hat Enterprise Linux Server (v. 7) – noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) – ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) – noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) – x86_64

3. Description:

The httpd packages provide the Apache HTTP Server, a powerful, efficient,
and extensible web server.

A flaw was found in the way httpd handled HTTP Trailer headers when
processing requests using chunked encoding. A malicious client could use
Trailer headers to set additional HTTP headers after header processing was
performed by other modules. This could, for example, lead to a bypass of
header restrictions defined with mod_headers. (CVE-2013-5704)

A NULL pointer dereference flaw was found in the way the mod_cache httpd
module handled Content-Type headers. A malicious HTTP server could cause
the httpd child process to crash when the Apache HTTP server was configured
to proxy to a server with caching enabled. (CVE-2014-3581)

This update also fixes the following bugs:

* Previously, the mod_proxy_fcgi Apache module always kept the back-end
connections open even when they should have been closed. As a consequence,
the number of open file descriptors was increasing over the time. With this
update, mod_proxy_fcgi has been fixed to check the state of the back-end
connections, and it closes the idle back-end connections as expected.
(BZ#1168050)

* An integer overflow occurred in the ab utility when a large request count
was used. Consequently, ab terminated unexpectedly with a segmentation
fault while printing statistics after the benchmark. This bug has been
fixed, and ab no longer crashes in this scenario. (BZ#1092420)

* Previously, when httpd was running in the foreground and the user pressed
Ctrl+C to interrupt the httpd processes, a race condition in signal
handling occurred. The SIGINT signal was sent to all children followed by
SIGTERM from the main process, which interrupted the SIGINT handler.
Consequently, the affected processes became unresponsive or terminated
unexpectedly. With this update, the SIGINT signals in the child processes
are ignored, and httpd no longer hangs or crashes in this scenario.
(BZ#1131006)

In addition, this update adds the following enhancements:

* With this update, the mod_proxy module of the Apache HTTP Server supports
the Unix Domain Sockets (UDS). This allows mod_proxy back ends to listen on
UDS sockets instead of TCP sockets, and as a result, mod_proxy can be used
to connect UDS back ends. (BZ#1168081)

* This update adds support for using the SetHandler directive together with
the mod_proxy module. As a result, it is possible to configure SetHandler
to use proxy for incoming requests, for example, in the following format:
SetHandler “proxy:fcgi://127.0.0.1:9000”. (BZ#1136290)

* The htaccess API changes introduced in httpd 2.4.7 have been backported
to httpd shipped with Red Hat Enterprise Linux 7.1. These changes allow for
the MPM-ITK module to be compiled as an httpd module. (BZ#1059143)

All httpd users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues and add these
enhancements. After installing the updated packages, the httpd daemon will
be restarted automatically.

4. Solution:

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

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1059143 – Feature request: update httpd to 2.4.7 / backport htaccess API changes
1060536 – mod_rewrite doesn’t expose client_addr
1073078 – mod_ssl uses small DHE parameters for non standard RSA keys
1073081 – mod_ssl selects correct DHE parameters for keys only up to 4096 bit
1080125 – httpd uses hardcoded curve for ECDHE suites
1082903 – CVE-2013-5704 httpd: bypass of mod_headers rules via chunked requests
1114123 – RFE: set vstring dynamically
1131006 – Error in `/usr/sbin/httpd’: free(): invalid pointer
1131847 – authzprovideralias and authnprovideralias-defined provider can’t be used in virtualhost .
1136290 – SetHandler to proxy support
1149709 – CVE-2014-3581 httpd: NULL pointer dereference in mod_cache if Content-Type has empty value

6. Package List:

Red Hat Enterprise Linux Client Optional (v. 7):

Source:
httpd-2.4.6-31.el7.src.rpm

noarch:
httpd-manual-2.4.6-31.el7.noarch.rpm

x86_64:
httpd-2.4.6-31.el7.x86_64.rpm
httpd-debuginfo-2.4.6-31.el7.x86_64.rpm
httpd-devel-2.4.6-31.el7.x86_64.rpm
httpd-tools-2.4.6-31.el7.x86_64.rpm
mod_ldap-2.4.6-31.el7.x86_64.rpm
mod_proxy_html-2.4.6-31.el7.x86_64.rpm
mod_session-2.4.6-31.el7.x86_64.rpm
mod_ssl-2.4.6-31.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

Source:
httpd-2.4.6-31.el7.src.rpm

noarch:
httpd-manual-2.4.6-31.el7.noarch.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
httpd-2.4.6-31.el7.src.rpm

noarch:
httpd-manual-2.4.6-31.el7.noarch.rpm

ppc64:
httpd-2.4.6-31.el7.ppc64.rpm
httpd-debuginfo-2.4.6-31.el7.ppc64.rpm
httpd-devel-2.4.6-31.el7.ppc64.rpm
httpd-tools-2.4.6-31.el7.ppc64.rpm
mod_ssl-2.4.6-31.el7.ppc64.rpm

s390x:
httpd-2.4.6-31.el7.s390x.rpm
httpd-debuginfo-2.4.6-31.el7.s390x.rpm
httpd-devel-2.4.6-31.el7.s390x.rpm
httpd-tools-2.4.6-31.el7.s390x.rpm
mod_ssl-2.4.6-31.el7.s390x.rpm

x86_64:
httpd-2.4.6-31.el7.x86_64.rpm
httpd-debuginfo-2.4.6-31.el7.x86_64.rpm
httpd-devel-2.4.6-31.el7.x86_64.rpm
httpd-tools-2.4.6-31.el7.x86_64.rpm
mod_ssl-2.4.6-31.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
httpd-debuginfo-2.4.6-31.el7.ppc64.rpm
mod_ldap-2.4.6-31.el7.ppc64.rpm
mod_proxy_html-2.4.6-31.el7.ppc64.rpm
mod_session-2.4.6-31.el7.ppc64.rpm

s390x:
httpd-debuginfo-2.4.6-31.el7.s390x.rpm
mod_ldap-2.4.6-31.el7.s390x.rpm
mod_proxy_html-2.4.6-31.el7.s390x.rpm
mod_session-2.4.6-31.el7.s390x.rpm

x86_64:
httpd-debuginfo-2.4.6-31.el7.x86_64.rpm
mod_ldap-2.4.6-31.el7.x86_64.rpm
mod_proxy_html-2.4.6-31.el7.x86_64.rpm
mod_session-2.4.6-31.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
httpd-2.4.6-31.el7.src.rpm

noarch:
httpd-manual-2.4.6-31.el7.noarch.rpm

x86_64:
httpd-2.4.6-31.el7.x86_64.rpm
httpd-debuginfo-2.4.6-31.el7.x86_64.rpm
httpd-devel-2.4.6-31.el7.x86_64.rpm
httpd-tools-2.4.6-31.el7.x86_64.rpm
mod_ssl-2.4.6-31.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
httpd-debuginfo-2.4.6-31.el7.x86_64.rpm
mod_ldap-2.4.6-31.el7.x86_64.rpm
mod_proxy_html-2.4.6-31.el7.x86_64.rpm
mod_session-2.4.6-31.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2013-5704
https://access.redhat.com/security/cve/CVE-2014-3581
https://access.redhat.com/security/updates/classification/#low

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

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