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Actively exploited · Published Aug 17, 2023 · Assigned by juniper

CVE-2023-36845Junos OS: EX and SRX Series: A PHP vulnerability in J-Web allows an unauthenticated to control an important environment variable

Critical 9.8 Exploited

In plain English

A critical-severity security flaw in Junos OS from Juniper Networks. Attackers are actively exploiting it in the wild (listed by CISA on November 13, 2023). The chance it is exploited in the next 30 days is estimated at 95.1% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)95.1%top 0.1% of all CVEs
Exploited in the wildYesCISA KEV since Nov 13, 2023
Attack tooling3Metasploit, Nuclei, Public PoC

CISA guidance

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Federal agencies must remediate by Nov 17, 2023.

Official description

A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series and SRX Series allows an unauthenticated, network-based attacker to remotely execute code. Using a crafted request which sets the variable PHPRC an attacker is able to modify the PHP execution environment allowing the injection und execution of code. This issue affects Juniper Networks Junos OS on EX Series and 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.

Affected products (as reported)

VendorProductVersions
Juniper Networks Junos OS 0 – before 20.4R3-S921.1 – before 21.1*21.2 – before 21.2R3-S721.3 – before 21.3R3-S521.4 – before 21.4R3-S522.1 – before 22.1R3-S422.2 – before 22.2R3-S222.3 – before 22.3R2-S2, 22.3R3-S1

Weakness: CWE-473 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References