CVE-2024-21619

/// Technical description

A Missing Authentication for Critical Function vulnerability combined with a Generation of Error Message Containing Sensitive Information vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an unauthenticated, network-based attacker to access sensitive system information.

When a user logs in, a temporary file which contains the configuration of the device (as visible to that user) is created in the /cache folder. An unauthenticated attacker can then attempt to access such a file by sending a specific request to the device trying to guess the name of such a file. Successful exploitation will reveal configuration information.

This issue affects Juniper Networks Junos OS on SRX Series and EX Series:

* All versions earlier than 20.4R3-S9;

* 21.2 versions earlier than 21.2R3-S7;

* 21.3 versions earlier than 21.3R3-S5;

* 21.4 versions earlier than 21.4R3-S6;

* 22.1 versions earlier than 22.1R3-S5;

* 22.2 versions earlier than 22.2R3-S3;

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References