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Unauthorized user can obtain root access using cli

  [JSA10420] Show Article Properties


Legacy Advisory Id:
PSN-2010-01-624
Product Affected:
All JUNOS Devices
Problem:
Any user can obtain "root" access by intentionally confusing the cli parser, using ``unexpected'' tokens. This allows an attacker to raise the privilege level assigned in order to do other attacks.

This issue was discovered through internal security audits.
Solution:
Customers are recommended to upgrade JUNOS through planned and methodical upgrade processes.

All JUNOS software releases built on or after December 12, 2008 have been corrected to correct this CLI issue. This specifically includes 8.5-20081226-SR, 9.0-20081219-SR, 9.1-200901-09-SR, 9.1R4, 9.2R3, 9.3-20090227-SR, 9.3R3, 9.4R1, and all subsequent releases.

PR Reference for this issue is PR 397624

This issue requires user login to the JUNOS device. Appropriate Best Common Practices (BCPs) to insure only authorized users can access the device are effective tool to limit exposure.
Implementation:
How to obtain Service Releases:
Security vulnerabilities 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 notices will indicate which Maintenance and/or 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.
Related Links:
CVSS Score:
6.6.
Risk Level:
High
Risk Assessment:
Requires access to the CLI to execute.

Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."