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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
OpenSSH TTY Permissions Let Local Users Cause Denial of Service Conditions
SecurityTracker Alert ID:  1033917
SecurityTracker URL:  http://securitytracker.com/id/1033917
CVE Reference:   CVE-2015-6565   (Links to External Site)
Date:  Oct 22 2015
Impact:   Denial of service via local system, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.8, 6.9
Description:   A vulnerability was reported in OpenSSH. A local user can cause denial of service conditions on the target system.

The system sets TTYs with world-writable permissions. A local user may be able to write arbitrary messages, including escape sequences, to other users on the target system.

Nikolay Edigaryev reported this vulnerability.

Impact:   A local user can write arbitrary messages, including escape sequences, to other users on the target system, which may cause denial of service conditions.
Solution:   The vendor has issued a fix (7.0) [in August 2015].

The vendor's advisory is available at:

http://www.openssh.com/txt/release-7.0

Vendor URL:  www.openssh.com/txt/release-7.0 (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Nov 12 2015 (QNAP Systems Issues Fix for QNAP QTS) OpenSSH TTY Permissions Let Local Users Cause Denial of Service Conditions
QNAP Systems has issued a fix for QNAP QTS.
May 16 2016 (HP Issues Fix for HPE Systems Insight Manager) OpenSSH TTY Permissions Let Local Users Cause Denial of Service Conditions
HP has issued a fix for HPE Systems Insight Manager.



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