The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
Scope
S
An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized.
Confidentiality
Low
C
There is some impact on confidentiality, but the attacker either does not gain control of any data, or the information obtained does not have a significant impact on the system or its operations.
Integrity
Low
I
Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability
None
A
There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.
TYPO3 CMS 2.0.3 Cross Site ScriptingSEC Consult Vulnerability Lab Security Advisory < 20170117-0 >
=======================================================================
title: Cross Site Scripting (XSS)
product: Recommend Page extension for TYPO3 CMS (pb_recommend_page)
vulnerable version: <=2.0.3
fixed version: -
CVE number: -
impact: Medium
homepage: https://typo3.org/
found: 2016-10-21
by: Siddhartha Tripathy (Office Singapore)
SEC Consult Vulnerability Lab
An integrated part of SEC Consult
Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow
Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich
https://www.sec-consult.com
=======================================================================
Vendor description:
-------------------
"The TYPO3 Universe offers highly flexible, scaleable and customizable products
for Web Content Management, providing the basis for websites, intranets and web &
mobile applications worldwide - always with a focus on the current needs of
businesses and public institutions."
"The Recommend Page extension Generates a form to send a link to a friend
(Recommend page, tip a friend), uses Swift Mailer"
Source: https://typo3.org/about/
https://typo3.org/extensions/repository/view/pb_recommend_page
Business recommendation:
------------------------
By exploiting the XSS vulnerability, an attacker can include HTML- or
JavaScript code at the affected web page. The code is executed in the
browser of users if they visit the manipulated site. The vulnerability
can be used to change the contents of the displayed site, redirect to
other sites or steal user credentials. Additionally, users are potential
victims of browser exploits and JavaScript Trojan Horses.
SEC Consult recommends not to use the extension until a thorough security
review has been performed by security professionals. Furthermore it seems
that the extension is not maintained anymore.
Vulnerability overview/description:
-----------------------------------
1) Cross Site Scripting (XSS)
The "Recommend page" extension for the TYPO3 CMS has a parameter
"tx_pbrecommendpage_pi1[url]" which is not properly sanitized. An attacker can
inject malicious HTML/JavaScript content which can cause harm to the users.
Proof of concept:
-----------------
1) Cross Site Scripting (XSS)
The "Recommend Page" extension generates a form to send a link to a friend,
where a user can add a link to send to other users. There an attacker can
inject a malicious JavaScript to harm other users.
The proof of concept URL as been removed as the vendor did not provide a patch yet.
Vulnerable / tested versions:
-----------------------------
The XSS vulnerability exists within the "pb_recommend_page" extension for the
TYPO3 CMS. The version of the extension could not be verified during the crash test.
It is assumed that the latest version v2.0.3 from November 2014 is affected as
well as all previous versions.
Vendor contact timeline:
------------------------
2016-10-26: Contacting vendor via [email protected]
2016-11-10: Response from TYPO3 Security team that they will investigate and get
it fixed upon confirmation
2016-11-26: Requesting status update from TYPO3 security team, no answer
2016-12-05: Requesting status update again, no answer
2016-12-22: Requesting status update again, no answer
2017-01-11: Contacted TYPO3 security team again, no answer
2017-01-17: Public release of advisory
Solution:
---------
There is no patch from the vendor available. It is recommended not to use this
extension until a thorough audit has been performed and the issues are fixed.
Workaround:
-----------
Sanitize user supplied content or create only one static pages to recommend.
Advisory URL:
-------------
https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SEC Consult Vulnerability Lab
SEC Consult
Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow
Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich
About SEC Consult Vulnerability Lab
The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It
ensures the continued knowledge gain of SEC Consult in the field of network
and application security to stay ahead of the attacker. The SEC Consult
Vulnerability Lab supports high-quality penetration testing and the evaluation
of new offensive and defensive technologies for our customers. Hence our
customers obtain the most current information about vulnerabilities and valid
recommendation about the risk profile of new technologies.
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S. Tripathy / @2017
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