Micro CMS 1.0 b1 - Persistent XSS Vulnerability

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Title    : Micro CMS Persistent Cross-Site Scripting Vulnerability.
Author   : Veerendra G.G from SecPod Technologies (www.secpod.com)
Vendor   : http://www.micro-cms.com/
Advisory : http://secpod.org/blog/?p=135
           http://secpod.org/advisories/SECPOD_MicroCMS.txt
Version  : Micro CMS 1.0 beta 1
Date     : 09/28/2010

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SecPod ID:      1004                            09/03/2010 Issue Discovered
                                                09/05/2010 Vendor Notified
                                                No Response from Vendor


Class:  Persistent Cross-Site Scripting         Severity: High


Overview:
---------
Micro CMS is prone to Persistent Cross-Site Scripting Vulnerability.

Technical Description:
----------------------
Micro CMS is prone to a Persistent Cross-Site vulnerability because it fails to
properly sanitize user-supplied input.

Input passed via the 'name' parameter(also in text-area) in a comment section
to "comments/send/" is not properly verified before it is returned to the
user. This can be exploited to execute arbitrary HTML and script code in a
user's browser session in the context of a vulnerable site. This may allow
the attacker to steal cookie-based authentication and to launch further attacks.

The exploit has been tested in Micro CMS 1.0 beta 1


Impact:
--------
Successful exploitation allows an attacker to execute arbitrary HTML and script
code in a user's browser session in the context of a vulnerable site.


Affected Software:
------------------
Micro CMS 1.0 beta 1 and prior


References:
-----------
http://www.micro-cms.com/
http://secpod.org/blog/?p=135
http://secpod.org/advisories/SECPOD_MicroCMS.txt


Proof of Concepts:
------------------
Add the following attack strings:
  1. My XSS Test </legend><script> alert('XSS-Test')</script> <!--

  OR

  2. My XSS Test </legend><script> alert('XSS-Test')</script>

  OR

  3. <script> alert('XSS-Test')</script>

  in "* Name" textbox in comment section and fill other sections properly.

NOTE :  Some time above POC/Exploit will disable adding comments for that post.


Workaround:
-----------
Not available


Solution:
----------
Not available


Risk Factor:
-------------
    CVSS Score Report:
        ACCESS_VECTOR          = NETWORK
        ACCESS_COMPLEXITY      = MEDIUM
        AUTHENTICATION         = NOT_REQUIRED
        CONFIDENTIALITY_IMPACT = NONE
        INTEGRITY_IMPACT       = PARTIAL
        AVAILABILITY_IMPACT    = PARTIAL
        EXPLOITABILITY         = PROOF_OF_CONCEPT
        REMEDIATION_LEVEL      = UNAVAILABLE
        REPORT_CONFIDENCE      = CONFIRMED
        CVSS Base Score        = 5.8 (AV:N/AC:M/Au:NR/C:N/I:P/A:P)
        CVSS Temporal Score    = 5.2
        Risk factor            = High

Credits:
--------
Veerendra G.G of SecPod Technologies has been credited with the discovery of
this vulnerability.