Vulnerabilities > CVE-2017-15271 - Use After Free vulnerability in Psftp Psftpd 10.0.4
Attack vector
NETWORK Attack complexity
HIGH Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
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.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 1 |
Common Weakness Enumeration (CWE)
Exploit-Db
| description | PSFTPd Windows FTP Server 10.0.4 Build 729 - Log Injection / Use-After-Free. CVE-2017-15270,CVE-2017-15271. Dos exploit for Windows platform |
| file | exploits/windows/dos/43144.txt |
| id | EDB-ID:43144 |
| last seen | 2017-11-14 |
| modified | 2017-11-14 |
| platform | windows |
| port | |
| published | 2017-11-14 |
| reporter | Exploit-DB |
| source | https://www.exploit-db.com/download/43144/ |
| title | PSFTPd Windows FTP Server 10.0.4 Build 729 - Log Injection / Use-After-Free |
| type | dos |
Packetstorm
| data source | https://packetstormsecurity.com/files/download/144972/X41-2017-006.txt |
| id | PACKETSTORM:144972 |
| last seen | 2017-11-14 |
| published | 2017-11-10 |
| reporter | Markus Vervier |
| source | https://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html |
| title | PSFTPd Windows FTP Server 10.0.4 Build 729 Use-After-Free / Log Injection |