[ISecAuditors Security Advisories] Multiple Vulnerabilities in Telaen <= 1.3.0

2013-07-1500:00:00

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INTERNET SECURITY AUDITORS ALERT 2013-009

Original release date: March 15th, 2013
Last revised: June 4th, 2013
Discovered by: Manuel Garcia Cardenas
Severity: 4,8/10 (CVSS Base Score)
CVE-ID: CVE-2013-2621,
CVE-2013-2623,
CVE-2013-2624
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I. VULNERABILITY

Multiple Vulnerabilities in Telaen <= 1.3.0

II. BACKGROUND

Telaen is a webmail reader application supporting both IMAP and POP3
protocols. It can be installed without dependence of any PHP's extra
modules or a separate database. It is Open source software published
under GNU General Public License (GPL).

The last version of Telaen is 1.3.0 released on January 2012.

III. DESCRIPTION

Telaen 1.3.0 and lower versions contain a flaw that allows a remote
redirection attack. This flaw exists because the application does not
properly sanitise the file "redir.php". This allows an attacker to
create a specially crafted URL, that if clicked, would redirect a
victim from the intended legitimate web site to an arbitrary web site
of the attacker's choice.

Aditionaly, it has been detected a reflected XSS vulnerability in
Telaen 1.3.0 and lower versions, that allows the execution of
arbitrary HTML/JavaScript code to be executed in the context of the
victim user's browser. The code injection is done through the
parameter "f_email" in the page index.php.

Due to the errors caused by the application Telaen 1.3.0 and lower
versions, we can display the full webapp installation path.

IV. PROOF OF CONCEPT

REDIRECT:
http://vulnerablesite.com/telaen/redir.php?http://www.malicious-site.com

XSS:
http://vulnerablesite.com/telaen/index.php?tid=default&lid=en_UK&f_email="><script>alert("XSS")</script>

FULL PATH DISCLOSURE: http://vulnerablesite.com/telaen/inc/init.php

V. BUSINESS IMPACT

REDIRECT: An attacker can redirect any user to any malicious website.
Below I have mentioned the vulnerable URL.

XSS: An attacker can execute arbitrary HTML or JavaScript code in a
targeted user's browser, this can leverage to steal sensitive
information as user credentials, personal data, etc.

FULL PATH DISCLOSURE: An attacker can obtain the full path to the
applitation and if the webroot is getting leaked, attackers may abuse
the knowledge and use it in combination with file inclusion
vulnerabilites to steal configuration files regarding the web
application or the rest of the operating system.

VI. SYSTEMS AFFECTED

Versions of Telaen < v1.3.1.

VII. SOLUTION

REDIRECT AND XSS: All data received by the application and can be
modified by the user, before making any kind of transaction with them
must be validated.

FULL PATH DISCLOSURE: Turn off display errors in the configuration and
unify the error pages.

VIII. REFERENCES

http://www.telaen.com
http://www.isecauditors.com

IX. CREDITS

This vulnerability has been discovered
by Manuel Garcia Cardenas (mgarcia (at) isecauditors (dot) com).

X. REVISION HISTORY

March 15, 2013: Initial release.
June 4, 2013: Last release

XI. DISCLOSURE TIMELINE

March 15, 2013: Vulnerability acquired by
Internet Security Auditors (www.isecauditors.com)
March 20, 2013: Sent to Devel Team.
March 28, 2013: Schedule for new version.
April 4, 2013: New version published.
June 3, 2013: Advisory sent to lists.

XII. LEGAL NOTICES

The information contained within this advisory is supplied "as-is"
with no warranties or guarantees of fitness of use or otherwise.
Internet Security Auditors accepts no responsibility for any damage
caused by the use or misuse of this information.

XIII. ABOUT

Internet Security Auditors is a Spain based leader in web application
testing, network security, penetration testing, security compliance
implementation and assessing. Our clients include some of the largest
companies in areas such as finance, telecommunications, insurance,
ITC, etc. We are vendor independent provider with a deep expertise
since 2001. Our efforts in R&D include vulnerability research, open
security project collaboration and whitepapers, presentations and
security events participation and promotion. For further information
regarding our security services, contact us.