Juniper Junos CVE-2019-0062 Session Fixation Vulnerability



Date Discovered

October 9, 2019


Juniper Junos is prone to a session-fixation vulnerability. An attacker can hijack an arbitrary session and gain unauthorized access to the affected application. The following versions of Juniper Junos are affected: Junper Junos 12.3 versions prior to 12.3R12-S15 for Juniper EX Series Junper Junos 12.3X48 versions prior to 12.3X48-D85 for Juniper SRX Series Junper Junos 14.1X53 versions prior to 14.1X53-D51 Junper Junos 15.1 versions prior to 15.1F6-S13 and 15.1R7-S5 Junper Junos 15.1X49 versions prior to 15.1X49-D180 for Juniper SRX Series Junper Junos 15.1X53 versions prior to 15.1X53-D238 Junper Junos 16.1 versions prior to 16.1R4-S13 and 16.1R7-S5 Junper Junos 16.2 versions prior to 16.2R2-S10 Junper Junos 17.1 versions prior to 17.1R3-S1 Junper Junos 17.2 versions prior to 17.2R2-S8 and 17.2R3-S3 Junper Junos 17.3 versions prior to 17.3R3-S5 Junper Junos 17.4 versions prior to 17.4R2-S8 and 17.4R3 Junper Junos 18.1 versions prior to 18.1R3-S8 Junper Junos 18.2 versions prior to 18.2R3 Junper Junos 18.3 versions prior to 18.3R3 Junper Junos 18.4 versions prior to 18.4R2 Junper Junos 19.1 versions prior to 19.1R1-S2 and 19.1R2

Technologies Affected

  • Juniper EX Series
  • Juniper JUNOS 12.3
  • Juniper Junos 12.3X48
  • Juniper Junos 14.1X53
  • Juniper Junos 15.1
  • Juniper Junos 15.1X49
  • Juniper Junos 15.1X53
  • Juniper Junos 16.1
  • Juniper Junos 16.2
  • Juniper Junos 17.1
  • Juniper Junos 17.2
  • Juniper Junos 17.3
  • Juniper Junos 17.4
  • Juniper Junos 18.1
  • Juniper Junos 18.2
  • Juniper Junos 18.3
  • Juniper Junos 18.4
  • Juniper Junos 19.1
  • Juniper SRX Series


Block external access at the network boundary, unless external parties require service.
If global access isn't needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Run all software as a nonprivileged user with minimal access rights.
Attackers may successfully exploit client flaws in the browser through cross-site scripting vulnerabilities. When possible, run all software as a user with minimal privileges and limited access to system resources. Use additional precautions such as restrictive environments to insulate software that may potentially handle malicious content.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to detect and block attacks and anomalous activity such as requests containing suspicious URI sequences. Since the webserver may log such requests, review its logs regularly.

Do not follow links provided by unknown or untrusted sources.
Web users should be cautious about following links to sites that are provided by unfamiliar or suspicious sources.

Updates are available. Please see the references or vendor advisory for more information.



Farid Heydari

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