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Category:   Application (Generic)  >   Nagios Vendors:   nagios.org
Nagios 'nagios.log' File Permissions Error Lets Local Users Obtain Root Privileges
SecurityTracker Alert ID:  1037487
SecurityTracker URL:  http://securitytracker.com/id/1037487
CVE Reference:   CVE-2016-9566   (Links to External Site)
Date:  Dec 17 2016
Impact:   Modification of system information, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to 4.2.4
Description:   A vulnerability was reported in Nagios. A local user can obtain root privileges on the target system.

The software does not drop root privileges before opening the '/usr/local/nagios/var/nagios.log' file for writing. A local user with 'nagios' user or 'nagios' group privileges can create a symbolic link (symlink) from a critical file on the target system to the log file to cause the symlinked file to be created with root privileges.

The original advisory and a demonstration exploit is available at:

https://legalhackers.com/advisories/Nagios-Exploit-Root-PrivEsc-CVE-2016-9566.html

Dawid Golunski reported this vulnerability.

Impact:   A local user can obtain root privileges on the target system.
Solution:   The vendor has issued a fix (4.2.4).

The vendor advisory is available at:

https://www.nagios.org/projects/nagios-core/history/4x/

Vendor URL:  www.nagios.org/projects/nagios-core/history/4x/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jan 31 2017 (Red Hat Issues Fix) Nagios 'nagios.log' File Permissions Error Lets Local Users Obtain Root Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Feb 7 2017 (Red Hat Issues Fix) Nagios 'nagios.log' File Permissions Error Lets Local Users Obtain Root Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Feb 7 2017 (Red Hat Issues Fix) Nagios 'nagios.log' File Permissions Error Lets Local Users Obtain Root Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 7.



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