zFtp Server <= 2011-04-13 | "STAT,CWD" Remote Denial of Service Vulnerability

1. OVERVIEW

The zFTP server is found to be vulnerable to denial of service in handling STAT and CWD commands with overly large buffer requests.


2. BACKGROUND

The zFTP server is a Windows based FTP server with focus on clever Active Directory integration and powerful, effortless administration.


3. VERSIONS AFFECTED

2011-04-13 and earlier


4. PROOF-OF-CONCEPT/EXPLOIT

http://www.exploit-db.com/exploits/18028/


5. SOLUTION

The vendor has released the patched version (http://download.zftpserver.com/zFTPServer_Suite_Setup.exe)


6. VENDOR

Vastgota-Data


7. CREDIT

This vulnerability was discovered by Myo Soe, http://yehg.net, YGN Ethical Hacker Group, Myanmar.


8. DISCLOSURE TIME-LINE

2011-06-19: notified vendor through email
2011-10-17: vendor released fixed version, 2011-10-17
2011-10-25: vulnerability disclosed


9. REFERENCES

Original Advisory URL: http://core.yehg.net/lab/pr0js/advisories/[zftpserver_2011-04-13]_stat,cwd_dos
zFTP Server Home Page: http://zftpserver.com


#yehg [2011-10-25]