Actively exploited · Published Aug 17, 2023 · Assigned by juniper
CVE-2023-36844Junos OS: EX Series: A PHP vulnerability in J-Web allows an unauthenticated attacker to control important environment variables
Medium 5.3 Exploited
In plain English
A medium-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 90.0% (higher than 99.8% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
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 allows an unauthenticated, network-based attacker to control certain, important environment variables. Using a crafted request an attacker is able to modify certain PHP environment variables leading to partial loss of integrity, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on 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 22.3R3-S1; * 22.4 versions prior to 22.4R2-S2, 22.4R3; * 23.2 versions prior to 23.2R1-S1, 23.2R2.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Juniper Networks | Junos OS | 0 – before 20.4R3-S921.1 – before 21.1*21.2 – before 21.2R3-S621.3 – before 21.3R3-S521.4 – before 21.4R3-S522.1 – before 22.1R3-S422.2 – before 22.2R3-S222.3 – before 22.3R3-S1 |
Weakness: CWE-473 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N