(Red Hat Issues Fix) Apache IncludesNoExec Options Restrictions Can Be Bypass By Local Users
SecurityTracker Alert ID: 1022553|
SecurityTracker URL: http://securitytracker.com/id/1022553
(Links to External Site)
Date: Jul 14 2009
Modification of user information|
Fix Available: Yes Vendor Confirmed: Yes |
A vulnerability was reported in Apache. A local user can bypass security restrictions.|
The "Options" and "AllowOverride" directives are not properly processed. A local user can enable Server Side Includes (SSI) even when the "IncludesNoEXEC" option is set.
If the system is configured with "AllowOverride Options=IncludesNoEXEC", a local user can place "Options Includes" in a '.htaccess' file to cause Server Side Includes to be enabled with exec privileges.
If the system is configured with "AllowOverride Options=IncludesNoEXEC" and with "Options IncludesNoExec" enabled in the same <Directory> context, a local user can place "Options +IncludesNoExec" in a '.htaccess' file to cause Server Side Includes to be enabled with exec privileges.
Jonathan Peatfield reported this vulnerability.
A local user can enable Server Side Includes in certain cases when SSI execution should be prohibited.|
Red Hat has released a fix.|
The Red Hat advisory is available at:
Vendor URL: httpd.apache.org/ (Links to External Site)
Access control error|
|Underlying OS: Linux (Red Hat Enterprise)|
|Underlying OS Comments: 5|
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Subject: [RHSA-2009:1156-01] Important: httpd security update|
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Red Hat Security Advisory
Synopsis: Important: httpd security update
Advisory ID: RHSA-2009:1156-01
Product: Red Hat Application Stack
Advisory URL: https://rhn.redhat.com/errata/RHSA-2009-1156.html
Issue date: 2009-07-14
CVE Names: CVE-2009-1195 CVE-2009-1890 CVE-2009-1891
Updated httpd packages that fix multiple security issues are now available
for Red Hat Application Stack v2.
This update has been rated as having important security impact by the Red
Hat Security Response Team.
2. Relevant releases/architectures:
Red Hat Application Stack v2 for Enterprise Linux (v.5) - i386, x86_64
The Apache HTTP Server is a popular Web server.
A denial of service flaw was found in the Apache mod_proxy module when it
was used as a reverse proxy. A remote attacker could use this flaw to force
a proxy process to consume large amounts of CPU time. (CVE-2009-1890)
A denial of service flaw was found in the Apache mod_deflate module. This
module continued to compress large files until compression was complete,
even if the network connection that requested the content was closed before
compression completed. This would cause mod_deflate to consume large
amounts of CPU if mod_deflate was enabled for a large file. (CVE-2009-1891)
A flaw was found in the handling of the "Options" and "AllowOverride"
directives used by the Apache HTTP Server. In configurations using the
"AllowOverride" directive with certain "Options=" arguments, local users
were not restricted from executing commands from a Server-Side-Include
script as intended. (CVE-2009-1195)
All httpd users should upgrade to these updated packages, which contain
backported patches to correct these issues. After installing the updated
packages, the httpd daemon must be restarted for the update to take effect.
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
5. Bugs fixed (http://bugzilla.redhat.com/):
489436 - CVE-2009-1195 AllowOverride Options=IncludesNoExec allows Options Includes
509125 - CVE-2009-1891 httpd: possible temporary DoS (CPU consumption) in mod_deflate
509375 - CVE-2009-1890 httpd: mod_proxy reverse proxy DoS (infinite loop)
6. Package List:
Red Hat Application Stack v2 for Enterprise Linux (v.5):
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <firstname.lastname@example.org>. More contact
details at https://www.redhat.com/security/team/contact/
Copyright 2009 Red Hat, Inc.
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