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FOREGROUND SECURITY, SECURITY ADVISORY 2012-001
- Original release date: August 16, 2012
- Discovered by: Jose Carlos de Arriba (Penetration Testing Team Lead at Foreground Security)
- Contact: (jcarriba (at) foregroundsecurity (dot) com, dade (at) painsec (dot) com)
- Twitter: @jcarriba
- Severity: 4.3/10 (Base CVSS Score)
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I. VULNERABILITY
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Lsoft ListServ v16 (WA revision R4241) Cross-Site Scripting (XSS) vulnerability (prior versions have not been checked but could be vulnerable too).

II. BACKGROUND
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LISTSERV launched the email list industry 25 years ago and remains the gold standard. Continuously developed to meet the latest demands, LISTSERV provides the power, reliability and enterprise-level performance you need to manage all of your opt-in email lists, including email newsletters, announcement lists, discussion groups and email communities.

L-Soft is a pioneer in the fields of email list management software, email marketing software and email list hosting services. L-Soft's solutions are used for managing email newsletters, discussion groups, email communities and opt-in email marketing campaigns.

III. DESCRIPTION
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Lsoft ListServ v16 (WA revision R4241) presents a Cross-Site Scripting (XSS) vulnerability on the parameters 'SHOWTPL' in the  web form page, due to an insufficient sanitization on user supplied data and encoding output.

A malicious user could perform session hijacking or phishing attacks.

IV. PROOF OF CONCEPT
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http://www.example.com/SCRIPTS/WA.EXE?SHOWTPL=<script>alert(document.cookie)</script>

V. BUSINESS IMPACT
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An attacker could perform session hijacking or phishing attacks.

VI. SYSTEMS AFFECTED
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Lsoft ListServ v16 - WA revision R4241  (prior or later versions have not been checked so could be affected).

VII. SOLUTION
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Fixed on WA revision r4276.

VIII. REFERENCES
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http://www.foregroundsecurity.com/
http://www.painsec.com
http://www.lsoft.com/

IX. CREDITS
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This vulnerability has been discovered by Jose Carlos de Arriba (jcarriba (at) foregroundsecurity (dot) com, dade (at) painsec (dot) com).

X. REVISION HISTORY
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- August 16, 2012: Initial release.

XI. DISCLOSURE TIMELINE
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August 8, 2012: Vulnerability discovered by Jose Carlos de Arriba.
August 8, 2012: Vendor contacted by email.
August 9, 2012: Response from vendor asking for details and security advisory sent to it.
August 15, 2012: Security advisory sent to vendor.
August 15, 2012: Response from vendor with a new WA revision (r4276) with bug fixed.
August 16, 2012: Security advisory released


XII. LEGAL NOTICES
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The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.


Jose Carlos de Arriba, CISSP
Penetration Testing Team Lead
Foreground Security
www.foregroundsecurity.com
jcarriba (a t) foregroundsecurity (d o t ) com