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2015-10 Security Bulletin: QFabric 3100 Director: CUPS printing system Improper Update of Reference Count leads to remote chained vulnerability attack via XSS against authenticated users (CVE-2015-1158, CVE-2015-1159)

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Article ID: JSA10702 SECURITY_ADVISORIES Last Updated: 14 Oct 2015Version: 2.0
Product Affected:
​QFabric 3100 Director version 12.x and earlier.
Problem:
​A remote attacker can carry out a chained XSS attack against the QFabric 3100 Director version(s) 12.x and lower through an authenticated user's web browser and subsequently gain complete control of the QFabric 3100 Director host-OS.

This issue is assigned CVE-2015-1158 and CVE-2015-1159.
Solution:
The following software releases have been updated to resolve this specific issue: This issue is resolved in Junos OS higher than 12.x on the QFabric 3100 Director. 12.x and prior versions should manually remove the CUPS system by following the workaround section.

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

This issue is being tracked as PR 1086957 and is visible on the Customer Support website.

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.​​


Workaround:
In order to stop CUPS, execute the following from the linux shell of the QFabric 3100 Director in each QFabric 3100 Director node for each Director Group in a deployment.
1. service cups stop

2. chkconfig —del cups

3. rm -rf /etc/init.d/cups 
Additionally, administrative systems used to authenticate to the QFabric 3100 Director should be protected from casual web browsing to sites that could inject XSS/XEE/CSRF attacks against administrative systems.
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:
Modification History:

2015-10-14: Initial publication

CVSS Score:
7.6 (CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H)
Severity Level:
High
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories"
Acknowledgements:

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