CVE-2017-15271

Public exploit code

Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.

• PSFTPd Windows FTP Server 10.0.4 Build 729 - Log Injection / Use-After-Free2017-11-14 · dos · windows

Impact

A use-after-free issue could be triggered remotely in the SFTP component of PSFTPd 10.0.4 Build 729. This issue could be triggered prior to authentication. The PSFTPd server did not automatically restart, which enabled attackers to perform a very effective DoS attack against this service. By sending a crafted SSH identification / version string to the server, a NULL pointer dereference could be caused, apparently because of a race condition in the window message handling, performing the cleanup for invalid connections. This incorrect cleanup code has a use-after-free.

Affected products

Weakness classification

References

• NVD record
• CVE.org record
• http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html
• http://www.securityfocus.com/archive/1/541518/100/0/threaded
• https://www.exploit-db.com/exploits/43144/
• https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/
• http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html
• http://www.securityfocus.com/archive/1/541518/100/0/threaded
• https://www.exploit-db.com/exploits/43144/
• https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/