CVE-2023-36845: Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability

CVE-2023-36845 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2023-11-13

A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to remotely execute code. By sending a crafted request that sets the PHPRC environment variable, an attacker can modify the PHP execution environment to inject and execute arbitrary code.

Technologies: Juniper Junos OS. Vendors: Juniper.

Quick answers

Is CVE-2023-36845 exploited in the wild?
Yes. CVE-2023-36845 is known to be exploited in the wild, first recorded on 13 November 2023. Treat it as urgent.
How severe is CVE-2023-36845?
Critical severity, with a CVSS score of 9.8, published 13 November 2023.
Which products and versions are affected?
Juniper Networks Junos OS EX Series All versions prior to 20.4R3-S9; 21.1 versions 21.1R1 and later; 21.2 versions prior to 21.2R3-S7; 21.3 versions prior to 21.3R3-S5; 21.4 versions prior to 21.4R3-S5; 22.1 versions prior to 22.1R3-S4; 22.2 versions prior to 22.2R3-S2; 22.3 versions prior to 22.3R2-S2, 22.3R3-S1; 22.4 versions prior to 22.4R2-S1, 22.4R3; 23.2 versions prior to 23.2R1-S1, 23.2R2.; Juniper Networks Junos OS SRX Series All versions prior to 20.4R3-S9; 21.1 versions 21.1R1 and later; 21.2 versions prior to 21.2R3-S7; 21.3 versions prior to 21.3R3-S5; 21.4 versions prior to 21.4R3-S5; 22.1 versions prior to 22.1R3-S4; 22.2 versions prior to 22.2R3-S2; 22.3 versions prior to 22.3R2-S2, 22.3R3-S1; 22.4 versions prior to 22.4R2-S1, 22.4R3; 23.2 versions prior to 23.2R1-S1, 23.2R2..
Is there a fix for CVE-2023-36845?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2023-36845 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2023-36845?
Check whether you run Juniper Junos OS. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Juniper Networks Junos OS EX Series All versions prior to 20.4R3-S9; 21.1 versions 21.1R1 and later; 21.2 versions prior to 21.2R3-S7; 21.3 versions prior to 21.3R3-S5; 21.4 versions prior to 21.4R3-S5; 22.1 versions prior to 22.1R3-S4; 22.2 versions prior to 22.2R3-S2; 22.3 versions prior to 22.3R2-S2, 22.3R3-S1; 22.4 versions prior to 22.4R2-S1, 22.4R3; 23.2 versions prior to 23.2R1-S1, 23.2R2.
  • Juniper Networks Junos OS SRX Series All versions prior to 20.4R3-S9; 21.1 versions 21.1R1 and later; 21.2 versions prior to 21.2R3-S7; 21.3 versions prior to 21.3R3-S5; 21.4 versions prior to 21.4R3-S5; 22.1 versions prior to 22.1R3-S4; 22.2 versions prior to 22.2R3-S2; 22.3 versions prior to 22.3R2-S2, 22.3R3-S1; 22.4 versions prior to 22.4R2-S1, 22.4R3; 23.2 versions prior to 23.2R1-S1, 23.2R2.

Timeline

  • 2023-11-13: disclosed
  • 2023-11-13: kev added: Added to CISA Known Exploited Vulnerabilities Catalog

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.