CVE-2016-5195: Linux Kernel Privilege Escalation

Advisory ID: 16-0019
Publish Date: 2016-10-27
Revision: 1.3 (updated 2016-12-06)

Summary

Mitel has become aware of a Linux Kernel Privilege Escalation vulnerability associated with the Copy on Write function, which affects multiple Linux distributions and versions. This vulnerability, nicknamed “Dirty COW” has the following CVE ID assigned:

Detailed Description

As per Red Hat

"A race condition as found in the way the Linux kernel's memory subsystem handled the copy-on-write (COW) breakage of private read-only memory mappings. An unprivileged local user could use this flaw to gain write access to otherwise read-only memory mappings and thus increase their privileges on the system"

Affected Products

Security Bulletins are currently available for the following products:

Product Name  Product Versions  Security Bulletin  Last Updated 
Mitel Standard Linux  MSL 10.1.52.0 and earlier
MSL 10.3.41.0 and earlier
MSL 10.4.17.0 and earlier
MSL 10.5.14.0 and earlier 		 16-0019-001 2016-12-02
MiVoice MX-ONE   v6.0 – v6.2  16-0019-002   2016-12-02 
Clearspan  RHEL 5, CentOS 6   16-0019-003   2016-12-02
MiVoice Office 400 Virtual Appliance  V4.0 – 4.1  16-0019-004  2016-12-02 
Open Interface Platform Virtual
Appliance 		 8.6.1.2  16-0019-005  2016-12-02 
MiVoice Office 250   Release 6.2 (incl. SP1)  16-0019-006  2016-12-02 
MiVoice Business for VMware Virtual
Appliance 		 All  16-0019-007  2016-12-02 
MiVoice Business for Stratus   All versions running Red Hat
Linux 6.3  		 16-0019-007   2016-12-02
MiVoice Business for Industry
Standard Server 		 All  16-0019-007  2016-12-02 
MiVoice Business for Multi-instance
platform - Server Manager 		 All  16-0019-007  2016-12-02 
MiVoice Border Gateway  8.1, 9.0 - 9.4 16-0019-008 2016-12-02 
MiCollab Client  v7.0 PR1 - v7.2.2  16-0019-009  2016-12-06 
Oria  4.0, 5.1-5.2  16-0019-010  2016-12-02 
NuPoint  NPM 7 SP2 (17.2.0.3) -
NPM 8 (18.0.0.49) - (18.2.2.6 		 16-0019-011  2016-12-06 
MiCollab AWV AWV 5.0 (5.0.5.7),
AWV 6.x (6.0.0.61) - (6.2.2.8) 		 16-0019-012   2016-12-06
MiVoice 5000 Manager  v2.4, v3.1 - 3.3  16-0019-013  2016-12-06 

This section will be updated as additional Security Bulletins are issued.

Products Not Affected

Products using the Windows Operating System are not affected.

Risk Assessment

Red Hat has assigned CVE-2016-5195 with a CVSS v2 Base Score of 6.9. This vulnerability requires local access to exploit, although general exploits for this vulnerability have been released which might allow for the exploitation of this vulnerability via unpatched web applications or other interfaces. At this time, Mitel has no knowledge of Mitel systems that have been compromised.

The risk associated with affected Mitel products will vary from product to product.

Mitigation / Recommended Action

This advisory will be updated to communicate remediation versions for affected products as identified.

The maintainers of various distributions are releasing kernel updates to address this vulnerability. Customers running Mitel Applications on their own operating systems are advised to contact the respective vendor to determine which updates should be applied.

Additional recommendations will be issued as Mitel continues its investigation.

External References

https://bugzilla.redhat.com/show_bug.cgi?id=1384344
https://dirtycow.ninja/

Related CVEs / CWEs / Advisories

CVE-2016-5195

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