Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Psftp | Psftpd | 10.0.4 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-BuiThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/archive/1/541518/100/0/threaded
- https://www.exploit-db.com/exploits/43144/Third Party AdvisoryVDB 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-BuiThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/archive/1/541518/100/0/threaded
- https://www.exploit-db.com/exploits/43144/Third Party AdvisoryVDB Entry
- https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/Third Party Advisory
FAQ
What is CVE-2017-15271?
CVE-2017-15271 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 rest...
How severe is CVE-2017-15271?
CVE-2017-15271 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-15271?
Check the references section above for vendor advisories and patch information. Affected products include: Psftp Psftpd.