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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
OpenSSH sftp-server Access Control Flaw Lets Remote Authenticated Users Create Zero-Length Files on the Target System
SecurityTracker Alert ID:  1039508
SecurityTracker URL:  http://securitytracker.com/id/1039508
CVE Reference:   CVE-2017-15906   (Links to External Site)
Updated:  Nov 15 2017
Original Entry Date:  Oct 4 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:   The vendor has issued a fix (7.6).

A source code fix (for openssh-portable) is available at:

https://github.com/openssh/openssh-portable/commit/4d827f0d75a53d3952288ab882efbddea7ffadfe#diff-066c02faff81900a14a658dae29b3e15

The vendor advisory is available at:

https://www.openssh.com/txt/release-7.6

Vendor URL:  www.openssh.com/txt/release-7.6 (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 15 2017 (IBM Issues Fix for IBM AIX) OpenSSH sftp-server Access Control Flaw Lets Remote Authenticated Users Create Zero-Length Files on the Target System
IBM has issued a fix for IBM AIX 5.3, 6.1, 7.1, and 7.2.
Jan 22 2018 (Ubuntu Issues Fix) OpenSSH sftp-server Access Control Flaw Lets Remote Authenticated Users Create Zero-Length Files on the Target System
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS, 16.04 LTS, and 17.10.
Apr 11 2018 (Red Hat Issues Fix) OpenSSH sftp-server Access Control Flaw Lets Remote Authenticated Users Create Zero-Length Files on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Sep 25 2018 (IBM Issues Fix for IBM Spectrum Protect Plus) OpenSSH sftp-server Access Control Flaw Lets Remote Authenticated Users Create Zero-Length Files on the Target System
IBM has issued a fix for IBM Spectrum Protect Plus.



 Source Message Contents



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