smallftpd <= 1.0.3-fix | Connection Saturation Remote Denial of Service Vulnerability

By YGN Ethical Hacker Group -
smallftpd <= 1.0.3-fix | Connection Saturation Remote Denial of
Service Vulnerability

1. OVERVIEW
The smallftpd FTP server is found to be vulnerable to denial of
service in handling multiple connection requests regardless of its
maximum connection settings. Upon successful DoS exploit, the
smallftpd will crash or reject new FTP login requests.

2. BACKGROUND
The smallftpd FTP server isis a small and simple muli-threaded ftp
server for windows.

3. VERSIONS AFFECTED
1.0.3-fix and earlier

4. PROOF-OF-CONCEPT/EXPLOIT
http://dev.metasploit.com/redmine/attachments/1330/smallftpd103fix_saturation.rb
http://www.exploit-db.com/download/17455

5. SOLUTION
The vendor has discontinued this product and therefore has no patch or
upgrade that mitigates this problem. It is recommended that an
alternate software package be used in its place.

6. VENDOR
Arnaud Mary

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

8. REFERENCES
Original Advisory URL:
http://core.yehg.net/lab/pr0js/advisories/smallftpd_103-fix_saturation_dos
SmallFTPD Home Page: http://smallftpd.sourceforge.net/
SmallFTPD Download Stat:
http://sourceforge.net/project/stats/?group_id=104723&ugn=smallftpd&type=&mode=alltime

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