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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(IBM Issues Fix for IBM AIX) OpenSSH sftp-server Access Control Flaw Lets Remote Authenticated Users Create Zero-Length Files on the Target System
SecurityTracker Alert ID:  1039802
SecurityTracker URL:  http://securitytracker.com/id/1039802
CVE Reference:   CVE-2017-15906   (Links to External Site)
Date:  Nov 15 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 7.6
Description:   A vulnerability was reported in OpenSSH. A remote authenticated user can cause denial of service conditions on the target system.

A remote authenticated user can exploit a flaw in the process_open() function in sftp-server when in read-only mode to cause the target service to create zero-length files.

Michal Zalewski reported this vulnerability.

Impact:   A remote authenticated user can cause zero-length files to be created on the target system.
Solution:   IBM has issued a fix for IBM AIX.

The IBM advisory is available at:

https://aix.software.ibm.com/aix/efixes/security/openssh_advisory11.asc

Vendor URL:  aix.software.ibm.com/aix/efixes/security/openssh_advisory11.asc (Links to External Site)
Cause:   Access control error
Underlying OS:  UNIX (AIX)
Underlying OS Comments:  5.3, 6.1, 7.1, 7.2

Message History:   This archive entry is a follow-up to the message listed below.
Oct 4 2017 OpenSSH sftp-server Access Control Flaw Lets Remote Authenticated Users Create Zero-Length Files on the Target System



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