CVE-2017-15271
A use-after-free issue could be triggered remotely in the SFTP component of PSFTPd 10.0.4 Build 729.
Does this matter?
Lower severity and a low EPSS score (8.74%). Track it; it rarely justifies an emergency change on its own.
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 3.0
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 8.74% probability · 95th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- psftp/psftpd
- Source
- cve@mitre.org
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.