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2019-04 Security Bulletin: Junos OS: 'set system ports console insecure' allows root password recovery on OAM volumes (CVE-2019-0035)

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Article ID: JSA10924 SECURITY_ADVISORIES Last Updated: 10 Apr 2019Version: 1.0
Product Affected:
This issue affects Junos OS 15.1, 15.1X49, 15.1X53, 16.1, 16.1X65, 16.2, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.2X75, 18.3.
Problem:

When "set system ports console insecure" is enabled, root login is disallowed for Junos OS as expected. However, the root password can be changed using "set system root-authentication plain-text-password" on systems booted from an OAM (Operations, Administration, and Maintenance) volume, leading to a possible administrative bypass with physical access to the console. OAM volumes (e.g. flash drives) are typically instantiated as /dev/gpt/oam, or /oam for short.

Password recovery, changing the root password from a console, should not have been allowed from an insecure console.

Affected releases are Juniper Networks Junos OS:

  • 15.1 versions prior to 15.1F6-S12, 15.1R7-S3;
  • 15.1X49 versions prior to 15.1X49-D160;
  • 15.1X53 versions prior to 15.1X53-D236, 15.1X53-D496, 15.1X53-D68;
  • 16.1 versions prior to 16.1R3-S10, 16.1R6-S6, 16.1R7-S3;
  • 16.1X65 versions prior to 16.1X65-D49;
  • 16.2 versions prior to 16.2R2-S8;
  • 17.1 versions prior to 17.1R2-S10, 17.1R3;
  • 17.2 versions prior to 17.2R1-S8, 17.2R3-S1;
  • 17.3 versions prior to 17.3R3-S3;
  • 17.4 versions prior to 17.4R1-S6, 17.4R2-S2;
  • 18.1 versions prior to 18.1R2-S4, 18.1R3-S3;
  • 18.2 versions prior to 18.2R2;
  • 18.2X75 versions prior to 18.2X75-D40;
  • 18.3 versions prior to 18.3R1-S2.

This issue does not affect Junos OS releases prior to 15.1.

Administrators can disable root login connections to the console, and if running a fixed release, restrict single-user mode password recovery via the following configuration command:

user@host# set system ports console insecure

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-2019-0035.
 

Solution:

The following software releases have been updated to resolve this specific issue: Junos OS 15.1F6-S12, 15.1R7-S3, 15.1X49-D160, 15.1X53-D236, 15.1X53-D496, 15.1X53-D68, 16.1R3-S10, 16.1R6-S6, 16.1R7-S3, 16.1X65-D49, 16.2R2-S8, 17.1R2-S10, 17.1R3, 17.2R1-S8, 17.2R3-S1, 17.3R3-S3, 17.4R1-S6, 17.4R2-S2, 18.1R2-S4, 18.1R3-S3, 18.2R2, 18.2X75-D40, 18.3R1-S2, 18.4R1, and all subsequent releases.

This issue is being tracked as PR 1368998 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 physical access to the recovery console to only trusted administrators.
 

Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
 
Modification History:
  • 2019-04-10: Initial Publication
     

CVSS Score:
6.8 (CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Severity Level:
Medium
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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