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             AUSCERT External Security Bulletin Redistribution

                               ESB-2009.1586
  Security Vulnerabilities in the Apache 2 "mod_perl2" Module Components
        "PerlRun.pm" and "Status.pm" May Lead to Denial of Service
                   (DoS) or Unauthorized Access to Data
                              3 December 2009

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           apache2
Publisher:         Sun Microsystems
Operating System:  Solaris
                   OpenSolaris
Impact/Access:     Denial of Service    -- Remote/Unauthenticated
                   Cross-site Scripting -- Remote/Unauthenticated
                   Unauthorised Access  -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2009-0796 CVE-2007-1349 

Reference:         ESB-2009.1495
                   ESB-2009.0353
                   ESB-2009.0064

Original Bulletin: 
   http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-272230-1

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Security Vulnerabilities in the Apache 2 "mod_perl2" Module Components
"PerlRun.pm" and "Status.pm" May Lead to Denial of Service (DoS) or
Unauthorized Access to Data
  _________________________________________________________________

Category : Security
Release Phase : Resolved
Bug Id : 6835110, 6867394
Product : Solaris 10 Operating System
OpenSolaris
Date of Resolved Release : 02-Dec-2009

Two security vulnerabilities exist in the Apache 2 ...


1. Impact

Two security vulnerabilities exist in the Apache 2 mod_perl2(3) module
components which affect the Apache 2.0 web server bundled with Solaris
10 and the Apache 2.2 web server bundled with OpenSolaris.

The first issue, a Denial of Service (DoS) vulnerability in the
"RunPerl.pm" component (CVE-2007-1349), may allow a remote unprivileged
user to cause a Denial of Service to the Apache 2 "httpd" process.

The second issue, a Cross Site Scripting (CSS or XSS) vulnerability in
the "Status.pm" component (CVE-2009-0796), may allow a remote unprivileged
user to inject arbitrary web script or HTML. This may allow the
unprivileged user to bypass access control and gain access to unauthorized
data.

Additional information regarding these issues is available at:

CVE-2007-1349 at:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1349

CVE-2009-0796 at:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0796


2. Contributing Factors

These issues can occur in the following releases:

SPARC Platform
  * Solaris 10 without patch 120543-15
  * OpenSolaris based upon builds snv_01 through snv_123

x86 Platform
  * Solaris 10 without patch 120544-15
  * OpenSolaris based upon builds snv_01 through snv_123

Note 1: OpenSolaris distributions may include additional bug fixes
above and beyond the build from which it was derived. To determine
the base build of OpenSolaris, the following command can be used:

 $ uname -v
  snv_111

Note 2: Solaris 8 and Solaris 9 do not include support for Apache 2
web server and so they are not impacted by these issues.

Note 3: A system is only vulnerable to the described issues if the
Apache 2 web server has been configured and is running on the system.
The following SMF command can be used to see if the Solaris 10 bundled
Apache 2.0 web server service is enabled:

 $ svcs svc:/network/http:apache2
 STATE          STIME    FMRI
 disabled       Feb_02   svc:/network/http:apache2

The following SMF command can be used to see if the OpenSolaris
bundled Apache 2.2 web server service is enabled:

 $ svcs svc:/network/http:apache22
 STATE          STIME    FMRI
 disabled       Feb_02   svc:/network/http:apache22

Note 4: First vulnerability (CVE-2007-1349) only affects systems which
make use of the Apache 2 Server mod_perl2(3) (PerlRun.pm) component.
To determine if the "PerlRun.pm" component is used, the following
command can be run for all configuration files that define the running
Apache 2 configurations:

For Solaris 10:

 $ grep PerlResponseHandler /etc/apache2/httpd.conf | grep ModPerl::PerlRun
 PerlResponseHandler ModPerl::PerlRun

For OpenSolaris:

 $ grep PerlResponseHandler /etc/apache2/2.2/httpd.conf | grep ModPerl::Perl Run 
 PerlResponseHandler ModPerl::PerlRun

Note 5: Second vulnerability (CVE-2009-0796) only affects systems
which make use of the Apache 2 Server mod_perl2(3) (Status.pm) component.

To determine if the "Status.pm" component is used, the following
command can be run for all configuration files that define the running Apache
2 configurations:

For Solaris 10:

 $ grep Apache2::Status  /etc/apache2/httpd.conf
 PerlResponseHandler Apache2::Status

For OpenSolaris:

 $ grep Apache2::Status  /etc/apache2/2.2/httpd.conf
 PerlResponseHandler Apache2::Status


3. Symptoms

If the first issue (CVE-2007-1349) is exploited, the Apache 2 web
server may be unresponsive, possibly consuming all available CPU resources.
Commands such as prstat(1M) can be used to determine the utilization
of system resources:

 $ prstat -s cpu
 [...]

There are no predictable symptoms that would indicate that the second
issue (CVE-2009-0796) has been exploited.


4. Workaround

To work around the described issues, do not configure the mod_perl2(3)
components PerlRun.pm and Status.pm in the Apache 2 "httpd.conf" file.
This may be done by commenting the corresponding sections in the file
("ModPerl::PerlRun" and "Apache2::Status").


5. Resolution

This issues are resolved in the following releases:

SPARC Platform
  * Solaris 10 with patch 120543-15 or later
  * OpenSolaris based upon builds snv_124 or later

x86 Platform
  * Solaris 10 with patch 120544-15 or later
  * OpenSolaris based upon builds snv_124 or later

For more information on Security Sun Alerts, see Technical Instruction
ID 213557:

http://sunsolve.sun.com/search/document.do?assetkey=1-61-213557-1
This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
warranties, or guarantees as to the information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements.


Copyright 2000-2009 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved

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