CVE-2023-36846

A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to user.php that doesn't require authentication an attacker is able to upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on SRX Series:
* All versions prior to 20.4R3-S8;
* 21.1: versions 21.1R1 and later;
* 21.2: versions prior to 21.2R3-S6;
* 21.3: versions prior to 21.3R3-S5;
* 21.4: versions prior to 21.4R3-S5;
* 22.1: versions prior to 22.1R3-S3;
* 22.2: versions prior to 22.2R3-S2;
* 22.3: versions prior to 22.3R2-S2, 22.3R3;
* 22.4: versions prior to 22.4R2-S1, 22.4R3.

Juniper Junos OS on SRX Series contains a missing authentication for critical function vulnerability that allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to user.php that doesn't require authentication, an attacker is able to upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system, which may allow chaining to other vulnerabilities.