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Category:   Application (Security)  >   Juniper NSM Vendors:   Juniper
(Juniper Issues Fix for Juniper NSM) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
SecurityTracker Alert ID:  1037620
SecurityTracker URL:  http://securitytracker.com/id/1037620
CVE Reference:   CVE-2016-5195   (Links to External Site)
Date:  Jan 18 2017
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): NSM3000, NSM4000, NSMExpress
Description:   A vulnerability was reported in the Linux kernel. A local user can obtain root privileges on the target system. Juniper NSM is affected.

A local user can a race condition in the kernel memory subsystem in the management of copy-on-write operations on read-only memory mappings to overwrite kernel memory and gain kernel-level privileges.

This vulnerability is being actively exploited.

Some demonstration exploit code is listed at:

https://github.com/dirtycow/dirtycow.github.io/wiki/PoCs

Impact:   A local user can obtain root privileges on the target system.
Solution:   The vendor has issued a fix (NSM Appliance Upgrade Package v3).

The Juniper advisory is available at:

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10774

Vendor URL:  kb.juniper.net/InfoCenter/index?page=content&id=JSA10774 (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Oct 22 2016 Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges



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