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AUSCERT External Security Bulletin Redistribution
2017-10 Security Bulletin: Multiple Products: "Dirty COW" Linux Kernel
Local Privilege Escalation (CVE-2016-5195)
12 October 2017
AusCERT Security Bulletin Summary
Product: Juniper Multiple Products
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Root Compromise -- Existing Account
CVE Names: CVE-2016-5195
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2017-10 Security Bulletin: Multiple Products: "Dirty COW" Linux Kernel Local
Privilege Escalation (CVE-2016-5195)
This issue affects Junos OS 14.1R, 14.1X53, 14.2R, 15.1R, 15.1F, 15.1F,
15.1X49, 15.1X53, 16.1R. Affected platforms: vRR, vMX, SRX, EX, QFX, PTX, T.
This issue affects Network and Security Manager 2012.2. This issue affects
CTPView 7.1R, 7.2R1, 7.3R. This issue affected Sky Advanced Threat Prevention.
A race condition in Linux allows local users to gain privileges by leveraging
incorrect handling of a copy-on-write (COW) feature to write to a read-only
memory mapping. This issue is also known as "Dirty COW."
Note for Junos OS in a virtualized environment:
Junos OS as Host OS with virtualized Junos Guest OS's; and Junos OS
non-virtualized; or Junos OS as the Host OS is not vulnerable to this issue.
Customers using Junos OS as a Guest OS in a virtualized Linux-based
environment such as VMWare, Wind River Linux, CentOS, Red Hat Enterprise
Linux, etc. as the Host OS are advised that exploitation is not possible by
default as there is no valid attack vector to exploit the vulnerability that
Juniper ships with its products. The underlying Linux kernel in the Host OS
may have the vulnerability present in the software packages Juniper provides.
Vulnerability scanners may alert that the vulnerability is present if these
virtualization packages are used. Should customers make changes to these Host
OS Linux packages, customers may inadvertently expose this vulnerability to
potential exploitation by an attacker. If customers require a fully-fixed
version of Junos OS as Guest OS running on top of a Linux-Based Host OS, then
customers should move to a fixed version as listed in the Junos OS Solutions
section of the advisory. If Juniper does not provide the underlying package,
customers should consult their manufacturer for guidance.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability
on Juniper devices. However, public exploits are available for this
This issue has been assigned CVE-2016-5195.
The following software releases have been updated to resolve this specific
14.1X53-D46, 15.1X49-D80, 15.1X53-D49, 15.1X53-D61, 15.1X53-D470, 16.1R3-S6,
and all subsequent releases. Any products using VMWare ESXi images should
refer to VMWare's VMSA VMSA-2016-0018 advisory for guidance.
2012.2R12 CentOS 6.5 Upgrade Package v3, and all subsequent releases.
7.1R4, and 7.3R2 and subsequent releases.
CVE-2016-5195 was fixed on Nov 17th 2016 for the Sky ATP cloud hosted service.
This issue is being tracked as PR 1227266 for Junos OS, 1226969 for CTPView,
1227267 for Sky ATP and 1227270 for NSM and are visible on the Customer
There are no viable workarounds for this issue.
It is good security practice to limit the exploitable attack surface of
critical infrastructure networking equipment. Use access lists or firewall
filters to limit access to the device from trusted, administrative networks or
Security vulnerabilities in Junos are fixed in the next available Maintenance
Release of each supported Junos version. In some cases, a Maintenance Release
is not planned to be available in an appropriate time-frame. For these cases,
Service Releases are made available in order to be more timely. Security
Advisory and Security Notices will indicate which Maintenance and Service
Releases contain fixes for the issues described. Upon request to JTAC,
customers will be provided download instructions for a Service Release.
Although Juniper does not provide formal Release Note documentation for a
Service Release, a list of "PRs fixed" can be provided on request.
NSM Maintenance Releases are available at http://support.juniper.net from the
"Download Software" links. If a Maintenance Release is not adequate and access
to NSM patches is needed, open a customer support case. A JTAC engineer will
review your request and respond, ensuring that you will be provided with the
most appropriate Patch Release for your specific situation.
2017-10-11: Initial Publication.
KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
KB16765: In which releases are vulnerabilities fixed?
KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security
Report a Vulnerability - How to Contact the Juniper Networks Security Incident
CVE-2016-5195 at cve.mitre.org
Multiple Products: "Dirty COW" Linux Kernel Local Privilege Escalation
KB16765 - "In which releases are vulnerabilities fixed?" describes which
release vulnerabilities are fixed as per our End of Engineering and End of
Life support policies.
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