National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2017-15271 Detail

Current 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.

Source:  MITRE      Last Modified:  11/15/2017      View Analysis Description

Quick Info

CVE Dictionary Entry:
CVE-2017-15271
Original release date:
11/15/2017
Last revised:
12/03/2017
Source:
US-CERT/NIST

Impact

CVSS Severity (version 3.0):
CVSS v3 Base Score:
5.9 Medium
Vector:
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H (legend)
Impact Score:
3.6
Exploitability Score:
2.2
CVSS Version 3 Metrics:
Attack Vector (AV):
Network
Attack Complexity (AC):
High
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
High
CVSS Severity (version 2.0):
CVSS v2 Base Score:
4.3 MEDIUM
Vector:
(AV:N/AC:M/Au:N/C:N/I:N/A:P) (legend)
Impact Subscore:
2.9
Exploitability Subscore:
8.6
CVSS Version 2 Metrics:
Access Vector:
Network exploitable
Access Complexity:
Medium
Authentication:
Not required to exploit
Impact Type:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource Type Source Name
http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html Third Party Advisory; VDB Entry External Source MISC 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/archive/1/541518/100/0/threaded Third Party Advisory; VDB Entry External Source BUGTRAQ 20171110 Advisory X41-2017-006: Multiple Vulnerabilities in PSFTPd Windows FTP Server
https://www.exploit-db.com/exploits/43144/ Third Party Advisory; VDB Entry External Source EXPLOIT-DB 43144
https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/ Third Party Advisory External Source MISC https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/

Technical Details

Vulnerability Type (View All)

Vulnerable software and versions Switch to CPE 2.2

Configuration 1
OR
cpe:2.3:a:psftp:psftpd:10.0.4:*:*:*:*:*:*:*

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History 2 change records found - show changes