Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability

Juniper Junos OS on EX 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 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.

cat cve-2023-36847.json

Vendor: Juniper
Product: Junos OS
CVSS: 5.3
EPSS (exploit probability): 84.6%
Status: kev
CISA patch-by (BOD 22-01): November 17, 2023
Published: November 13, 2023
Source: https://nvd.nist.gov/vuln/detail/CVE-2023-36847

Juniper Junos OS on EX 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 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.

Added to CISA’s Known Exploited Vulnerabilities catalog on 2023-11-13. Required action per CISA: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Due date: 2023-11-17.

This is an auto-synced KEV catalog record pending a full 0dayNews write-up — see CISA’s KEV catalog and the NVD record linked above for primary sources.