RHSA-2015:1666 - Security Advisory

Topic

Updated httpd24-httpd packages that fix multiple security issues are now
available for Red Hat Software Collections 2.

Red Hat Product Security has rated this update as having Moderate 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.

Description

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

Multiple flaws were found in the way httpd parsed HTTP requests and
responses using chunked transfer encoding. A remote attacker could use
these flaws to create a specially crafted request, which httpd would decode
differently from an HTTP proxy software in front of it, possibly leading to
HTTP request smuggling attacks. (CVE-2015-3183)

It was discovered that in httpd 2.4, the internal API function
ap_some_auth_required() could incorrectly indicate that a request was
authenticated even when no authentication was used. An httpd module using
this API function could consequently allow access that should have been
denied. (CVE-2015-3185)

Note: This update introduces new a new API function,
ap_some_authn_required(), which correctly indicates if a request is
authenticated. External httpd modules using the old API function should be
modified to use the new one to completely resolve this issue.

A denial of service flaw was found in the way the mod_lua httpd module
processed certain WebSocket Ping requests. A remote attacker could send a
specially crafted WebSocket Ping packet that would cause the httpd child
process to crash. (CVE-2015-0228)

A NULL pointer dereference flaw was found in the way httpd generated
certain error responses. A remote attacker could possibly use this flaw to
crash the httpd child process using a request that triggers a certain HTTP
error. (CVE-2015-0253)

All httpd24-httpd users are advised to upgrade to these updated packages,
which contain backported patches to correct these issues. After installing
the updated packages, the httpd24-httpd service will be restarted
automatically.

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

Affected Products

• Red Hat Software Collections (for RHEL Server) 1 for RHEL 7.7 x86_64
• Red Hat Software Collections (for RHEL Server) 1 for RHEL 7.6 x86_64
• Red Hat Software Collections (for RHEL Server) 1 for RHEL 7.5 x86_64
• Red Hat Software Collections (for RHEL Server) 1 for RHEL 7.4 x86_64
• Red Hat Software Collections (for RHEL Server) 1 for RHEL 7.3 x86_64
• Red Hat Software Collections (for RHEL Server) 1 for RHEL 7.2 x86_64
• Red Hat Software Collections (for RHEL Server) 1 for RHEL 7.1 x86_64
• Red Hat Software Collections (for RHEL Server) 1 for RHEL 7 x86_64
• Red Hat Software Collections (for RHEL Server) 1 for RHEL 6.6 x86_64
• Red Hat Software Collections (for RHEL Server) 1 for RHEL 6.5 x86_64
• Red Hat Software Collections (for RHEL Server) 1 for RHEL 6 x86_64
• Red Hat Software Collections (for RHEL Workstation) 1 for RHEL 7 x86_64
• Red Hat Software Collections (for RHEL Workstation) 1 for RHEL 6 x86_64
• Red Hat Software Collections (for RHEL Server) from RHUI 1 for RHEL 7 x86_64
• Red Hat Software Collections (for RHEL Server) from RHUI 1 for RHEL 6 x86_64

Fixes

• BZ - 1202988 - CVE-2015-0228 httpd: Possible mod_lua crash due to websocket bug
• BZ - 1243887 - CVE-2015-3183 httpd: HTTP request smuggling attack against chunked request parser
• BZ - 1243888 - CVE-2015-3185 httpd: ap_some_auth_required() does not properly indicate authenticated request in 2.4
• BZ - 1243891 - CVE-2015-0253 httpd: NULL pointer dereference crash with ErrorDocument 400 pointing to a local URL-path

CVEs

• CVE-2015-3185
• CVE-2015-3183
• CVE-2015-0253
• CVE-2015-0228

References

• https://access.redhat.com/security/updates/classification/#moderate