CVE-2023-36845

Known Exploited Public Exploit
Junos OS: EX and SRX Series: A PHP vulnerability in J-Web allows an unauthenticated to control an important environment variable

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.

Remediation

Solution:

  • The following software releases have been updated to resolve this specific issue: 20.4R3-S9*, 21.2R3-S7*, 21.3R3-S5, 21.4R3-S5*, 22.1R3-S4*, 22.2R3-S2, 22.3R2-S2, 22.3R3-S1*, 22.4R2-S1, 22.4R3*, 23.2R1-S1, 23.2R2*, 23.4R1*, and all subsequent releases. *Pending Publication

Workaround:

  • Disable J-Web, or limit access to only trusted hosts.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
EPSS 94.36% Top 5%
KEV Since 
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS
Published at:
Updated at:

References

Link Tags
https://supportportal.juniper.net/JSA72300 mitigation vendor advisory
http://packetstormsecurity.com/files/174865/Juniper-SRX-Firewall-EX-Switch-Remote-Code-Execution.html third party advisory vdb entry exploit
http://packetstormsecurity.com/files/176969/Juniper-SRX-Firewall-EX-Switch-Remote-Code-Execution.html third party advisory vdb entry exploit

Frequently Asked Questions

What is the severity of CVE-2023-36845?
CVE-2023-36845 has been scored as a critical severity vulnerability.
How to fix CVE-2023-36845?
To fix CVE-2023-36845: The following software releases have been updated to resolve this specific issue: 20.4R3-S9*, 21.2R3-S7*, 21.3R3-S5, 21.4R3-S5*, 22.1R3-S4*, 22.2R3-S2, 22.3R2-S2, 22.3R3-S1*, 22.4R2-S1, 22.4R3*, 23.2R1-S1, 23.2R2*, 23.4R1*, and all subsequent releases. *Pending Publication
Is CVE-2023-36845 being actively exploited in the wild?
It is confirmed that CVE-2023-36845 is actively exploited. Be extra cautious if you are using vulnerable components. According to its EPSS score, there is a ~94% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-36845?
CVE-2023-36845 affects Juniper Networks Junos OS.
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