(PT-2013-69) Positive Technologies Security Advisory
Denial of Service in Serv-U File Server

Vulnerable software

Serv-U File Server
Version: 15.0.0.0 and earlier

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

Severity level

Severity level: Medium
Impact: Denial of Service
Access Vector: Remote

CVSS v2:
Base Score: 5.0
Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

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 a Denial of Service vulnerability in Serv-U File Server.

Handling HTTP request with a recursive variable causes the application to enter an infinite loop, resulting in Denial of Service.

Exploitation

http://serv-u/Web%20Client/Error.htm?RESULT=%RESULT%

How to fix

Update your sofware up to the latest version

Advisory status

03.10.2013 - Vulnerability details were sent to CERT
19.02.2014 - 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-2013-69

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+