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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
SecurityTracker Alert ID:  1037078
SecurityTracker URL:  http://securitytracker.com/id/1037078
CVE Reference:   CVE-2016-5195   (Links to External Site)
Date:  Oct 22 2016
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Linux kernel. A local user can obtain root privileges on the target system.

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 source code fix, available at:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=19be0eaffa3ac7d8eb6784ad9bdbc7d67ed8e619

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry has one or more follow-up message(s) listed below.
Oct 22 2016 (Ubuntu Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 16.04 LTS.
Oct 22 2016 (Ubuntu Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS.
Oct 22 2016 (Ubuntu Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS.
Oct 22 2016 (Ubuntu Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 16.10.
Oct 24 2016 (Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Oct 25 2016 (CentOS Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
CentOS has issued a fix for CentOS 7.
Oct 26 2016 (Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Oct 26 2016 (Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 6.7.
Oct 27 2016 (Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 7.1.
Oct 27 2016 (Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 6.5.
Oct 28 2016 (CentOS Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
CentOS has issued a fix for CentOS 5.
Oct 28 2016 (Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 5.
Oct 31 2016 (Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 5.9.
Oct 31 2016 (Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 5.6.
Nov 1 2016 (Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 6.6.
Nov 1 2016 (QNAP Systems Issues Fix for QNAP Storage Devices) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
QNAP Systems has issued a fix for QNAP Storage Devices.
Nov 2 2016 (Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 6.6.
Nov 2 2016 (Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 6.2.
Nov 2 2016 (Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 6.4.
Nov 4 2016 (Oracle Issues Fix for Oracle Linux) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Oracle has issued a fix for Oracle Linux 6.
Nov 10 2016 (VMware Issues Fix for VMware vRealize Automation and Operations) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
VMware has issued a fix for VMware vRealize Automation and Operations.
Nov 11 2016 (QNAP Systems Issues Fix for QTS) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
QNAP Systems has issued a fix for QTS.
Dec 17 2016 (HPE Issues Fix for HPE Helion CloudSystem) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
HPE has issued a fix for HPE Helion CloudSystem.
Jan 18 2017 (Juniper Issues Fix for Juniper NSM) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Juniper has issued a fix for Juniper NSM3000, NSM4000, and NSMExpress.
Feb 23 2017 (Palo Alto Networks Issues Fix for Palo Alto PAN-OS) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
Palo Alto Networks has issued a fix for Palo Alto PAN-OS.



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