CVE-2023-36844: Juniper Junos OS EX Series PHP External Variable Modification Vulnerability

Juniper Junos OS on EX Series contains a PHP external variable modification vulnerability that 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.

VendorJuniper
ProductJunos OS
Date added to KEV2023-11-13
Due date (BOD 22-01)2023-11-17
Known ransomware campaign useUnknown
CWECWE-473
Required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What to do

  1. Identify every instance of Juniper Junos OS in your environment (asset inventory, EDR, vulnerability scanner).
  2. Apply CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  3. Federal civilian agencies must act by 2023-11-17 under BOD 22-01; other organizations can use the same date as a target.
  4. Check the vendor advisory and NVD entry linked below for affected versions, then record the fix in your change log.

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Sources

Generated from the CISA feed with AI assistance; facts are taken verbatim from the feed. Not affiliated with or endorsed by CISA. Facts come from the CISA Known Exploited Vulnerabilities catalog (public domain).