Withdrawn: 2019-04 Security Bulletin: Junos OS: gRPC hardcoded credentials may allow unauthorized access to systems with Junos Network Agent installed

  [JSA10923] Show Article Properties


Product Affected:
This issue affects Junos OS 16.1, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.2X75, 18.3.
Problem:

2019-04-12: Further investigation has determined that this issue has no impact.  While the credentials exist in affected releases there is no way to exploit this issue, and even if the issue were exploitable, there would be no impact. These credentials existed for specific internal product testing purposes which are not used as part of production releases of Junos OS.

Starting with Junos OS Release 16.1R3, the Junos Telemetry Interface supports Google gRPC remote procedure calls to provision sensors and to subscribe to and receive telemetry data.

Configuration files used by gRPC were found to contain hardcoded credentials that could be used by the Junos Network Agent to perform unauthorized read of certain non-critical information (e.g. sensor data). Additionally, APIs exposed via the Juniper Extension Toolkit (JET) may be able to perform non-critical 'set' operations on the device. These APIs need the client to be authenticated for which the username/password can be used.

Successful exploitation of this vulnerability can only occur if the Junos Network Agent package (Junos Telemetry Interface) is installed on the device. If the Junos Network

Agent is not installed, then the gRPC interface required to leverage these credentials is unavailable and the system is not vulnerable to this issue.

Affected releases are Juniper Networks Junos OS:

  • 16.1 versions prior to 16.1R3-S10, 16.1R7-S4;
  • 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-S3;
  • 18.1 versions prior to 18.1R2-S4, 18.1R3-S3;
  • 18.2 versions prior to 18.2R1-S5, 18.2R2-S1;
  • 18.2X75 versions prior to 18.2X75-D40;
  • 18.3 versions prior to 18.3R1-S2, 18.3R1-S3.

This issue does not affect Junos OS releases prior to 16.1.

Devices with Network Agent installed will match the following software version output:

user@junos> show version | grep na\ telemetry
JUNOS na telemetry [17.3R3-S3.3] 

gRPC is enabled by the following command:

user@junos# set system services extension-service request-response grpc

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 was formerly assigned CVE-2019-0034, but has been withdrawn (REJECTED). 
 

Solution:

The following software releases have been updated to resolve this specific issue: Junos OS 16.1R3-S10, 16.1R7-S4, 17.1R2-S10, 17.1R3, 17.2R1-S8, 17.2R3-S1, 17.3R3-S3, 17.4R1-S6, 17.4R2-S3, 18.1R2-S4, 18.1R3-S3, 18.2R1-S5, 18.2R2-S1, 18.2X75-D40, 18.3R1-S2, 18.4R1, and all subsequent releases.

This issue is being tracked as PR 1394927 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:

Disable the gRPC service via the following command if it is not needed in your environment:
 

delete system services extension-service request-response grpc 


In addition to the recommendation listed above, it is good security practice to limit the exploitable attack surface of critical infrastructure networking equipment. Use access lists or firewall filters to limit access to the device only from trusted, administrative networks or hosts.
 

Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
 
Modification History:
  • 2019-04-10: Initial Publication.
  • 2019-04-11: Further investigation has determined that this issue has no impact.   While the credentials exist in affected releases, there is no way to exploit this issue, and even if the issue were exploitable, there would be no impact.
  • 2019-04-12: CVE ID has been withdrawn. This JSA was formerly assigned CVE-2019-0034. 
    • Additional details: These credentials existed for specific internal product testing purposes which are not used as part of production releases of Junos OS.
Related Links:
CVSS Score:
0.0 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N)
Risk Level:
None
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."