Junos OS: EX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload arbitrary files

A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity.

With a specific request to installAppPackage.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 EX 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-S4; * 22.1 versions

prior to

22.1R3-S3; * 22.2 versions

prior to

22.2R3-S1; * 22.3 versions

prior to

22.3R2-S2, 22.3R3; * 22.4 versions

prior to

22.4R2-S1, 22.4R3.