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2019-10 Security Bulletin: Junos OS: Insecure management daemon (MGD) configuration may allow local privilege escalation (CVE-2019-0061)

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Article ID: JSA10960 SECURITY_ADVISORIES Last Updated: 22 Oct 2019Version: 5.0
Product Affected:
This issue affects Junos OS 15.1X49, 15.1X53, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.3, 18.4.
Problem:
The management daemon (MGD) is responsible for all configuration and management operations in Junos OS. The Junos CLI communicates with MGD over an internal unix-domain socket and is granted special permission to open this protected mode socket. Due to a misconfiguration of the internal socket, a local, authenticated user may be able to exploit this vulnerability to gain administrative privileges.

This issue only affects Junos OS Evolved (EVO) platforms and Linux-based Junos Device Manager (JDM). FreeBSD-based platforms and VMs are unaffected by this vulnerability. Junos OS Evolved platforms include: PTX10003, QFX5200, and QFX5220.

Exploitation of this vulnerability requires Junos shell access. This issue cannot be exploited from the Junos CLI.

This issue affects Juniper Networks Junos OS:

  • 15.1X49 versions prior to 15.1X49-D171, 15.1X49-D180;
  • 15.1X53 versions prior to 15.1X53-D496, 15.1X53-D69;
  • 16.1 versions prior to 16.1R7-S4;
  • 16.2 versions prior to 16.2R2-S9;
  • 17.1 versions prior to 17.1R3;
  • 17.2 versions prior to 17.2R1-S8, 17.2R2-S7, 17.2R3-S1;
  • 17.3 versions prior to 17.3R3-S4;
  • 17.4 versions prior to 17.4R1-S6, 17.4R1-S7, 17.4R2-S3, 17.4R3;
  • 18.1 versions prior to 18.1R2-S4, 18.1R3-S4;
  • 18.2 versions prior to 18.2R1-S5, 18.2R2-S2, 18.2R3;
  • 18.3 versions prior to 18.3R1-S3, 18.3R2;
  • 18.4 versions prior to 18.4R1-S2, 18.4R2.

Note: Some releases listed above may not be supported on the affected platforms, and are therefore not vulnerable to this issue.

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

This issue was found during internal product security testing or research.

This issue has been assigned CVE-2019-0061.
 

Solution:

The following software releases have been updated to resolve this specific issue: 15.1X49-D171, 15.1X49-D180, 15.1X53-D496, 15.1X53-D69, 16.1R7-S4, 16.2R2-S9, 17.1R3, 17.2R1-S8, 17.2R2-S7, 17.2R3-S1, 17.3R3-S4, 17.4R1-S6, 17.4R1-S7, 17.4R2-S3, 17.4R3, 18.1R2-S4, 18.1R3-S4, 18.2R1-S5, 18.2R2-S2, 18.2R3, 18.3R1-S3, 18.3R2, 18.4R1-S2, 18.4R2, 19.1R1, and all subsequent releases.

Note: This fix has been proactively committed into all supported releases. Some releases listed above may not be supported on the affected platforms, and are therefore not vulnerable to this issue.

This issue is being tracked as PR 1406219 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).
 

Workaround:
Limit access to the Junos shell to only trusted administrators.
 
Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
 
Modification History:
2019-10-09: Initial Publication.
2019-10-21: Clarified which Linux-based platforms (EVO) are affected by the vulnerability.

 
CVSS Score:
7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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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