CVE-2017-15271

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.

• CWE-416

• http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.htmlThird Party Advisory, VDB Entry
• http://www.securityfocus.com/archive/1/541518/100/0/threaded
• https://www.exploit-db.com/exploits/43144/Third Party Advisory, VDB Entry
• https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/Third Party Advisory
• http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.htmlThird Party Advisory, VDB Entry
• http://www.securityfocus.com/archive/1/541518/100/0/threaded
• https://www.exploit-db.com/exploits/43144/Third Party Advisory, VDB Entry
• https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/Third Party Advisory

Published

Nov 15, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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