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2017-04 Security Bulletin: Junos: Integer signedness buffer overflow vulnerability in keyboard driver (CVE-2016-1886)


Product Affected:
This issue can affect any product or platform running Junos OS.
Problem:
Incorrect signedness comparison in the ioctl(2) handler allows a malicious local user to overwrite a portion of the kernel memory.

A local user may crash the kernel, read a portion of kernel memory and execute arbitrary code in kernel context.

The result of executing an arbitrary kernel code is privilege escalation.

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-2016-1886.
 

Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 12.3X48-D55, 14.1R9, 14.1X53-D50, 14.2R7, 15.1F5-S5, 15.1F7, 15.1R5, 15.1X49-D60, 15.1X53-D230, 16.1R2, 16.2R1, 17.1R1, and all subsequent releases.

This issue is being tracked as PR
1184592 and is visible on the Customer Support website.
 
Workaround:
Use access lists or firewall filters to limit access to the device only from trusted administrative users, networks, and hosts.
 
Implementation:
How to obtain fixed software:
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:
2017-04-12: Initial publication


Related Links:
CVSS Score:
7.8 (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Risk Level:
High
Risk Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."