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2017-07 Security Bulletin: Junos: VM to host privilege escalation in platforms with Junos OS running in a virtualized environment. (CVE-2017-2341)

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Article ID: JSA10787 SECURITY_ADVISORIES Last Updated: 12 Jul 2017Version: 2.0
Product Affected:
This issue affects Junos OS 14.1X53, 15.1, 15.1X49, 16.1. Affected platforms: QFX5110, QFX5200, QFX10002, QFX10008, QFX10016, EX4600 and NFX250, EX4600, vSRX, SRX1500, SRX4100, SRX4200, ACX5000 series.
Problem:
An insufficient authentication vulnerability on platforms where Junos OS instances are run in a virtualized environment, may allow unprivileged users on the Junos OS instance to gain access to the host operating environment, and thus escalate privileges.

This issue only affects products or platforms where Junos OS instances are run in a virtualized environment, namely vSRX, SRX1500, SRX4100, SRX4200, QFX5110, QFX5200, QFX10002, QFX10008, QFX10016, ACX5000, EX4600 and NFX250 devices.

This issue does not affect Junos OS where FIPS mode is enabled.

This issue does not affect vMX.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

No other Juniper Networks products or platforms are affected by this issue.

This issue has been assigned CVE-2017-2341.
 
Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 14.1X53-D40, 15.1R5, 15.1X49-D70, 16.1R2 and all subsequent releases.

This issue is being tracked as PR 1161762 and is visible on the Customer Support website.
 
Workaround:
Running Junos OS in FIPS mode eliminates this vulnerability.
 
Implementation:
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.
 
Modification History:
2017-07-12: Initial release.
 
CVSS Score:
8.8 (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
Severity Level:
High
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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