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CVE-2023-36844— Junos OS: EX Series: A PHP vulnerability in J-Web allows an unauthenticated attacker to control important environment variables

Quick assessment

Affected
Juniper Networks Junos OS
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Juniper Networks Junos OS EX是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS EX存在安全漏洞，该漏洞源于J-Web模块存在PHP外部变量修改漏洞。

CVSS 5.3 · Medium KEV EPSS 91.36% · P100

Public Exploits 1

Nuclei · 1 CVE-2023-36844.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-36844

Vulnerability Information
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Vulnerability Title
Junos OS: EX Series: A PHP vulnerability in J-Web allows an unauthenticated attacker to control important environment variables
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
PHP参数外部修改
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS EX 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS EX是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS EX存在安全漏洞，该漏洞源于J-Web模块存在PHP外部变量修改漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Juniper Networks Junos OS 0 ~ 20.4R3-S9 -

II. Public POCs for CVE-2023-36844

# POC Description Source Link Shenlong Link
1 None https://github.com/watchtowrlabs/juniper-rce_cve-2023-36844 POC Details
2 Perform With Massive Juniper Remote Code Execution https://github.com/ThatNotEasy/CVE-2023-36844 POC Details
3 A Proof of Concept for chaining the CVEs [CVE-2023-36844, CVE-2023-36845, CVE-2023-36846, CVE-2023-36847] to achieve Remote Code Execution (phpinfo) in Juniper JunOS within SRX and EX Series products.Modified from original exploit developed by @watchTowr . https://github.com/r3dcl1ff/CVE-2023-36844_Juniper_RCE POC Details
4 Multiple cves in Juniper Network (CVE-2023-36844|CVE-2023-36845|CVE-2023-36846|CVE-2023-36847).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 environments variables. Utilizing a crafted request an attacker is able to modify certain PHP environments variables leading to partial loss of integrity, which may allow chaining to other vulnerabilities. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-36844.yaml POC Details
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III. Intelligence Information for CVE-2023-36844

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Other References for CVE-2023-36844 (1)

Same Patch Batch · Juniper Networks · 2023-08-17 · 4 CVEs total

CVE-2023-36845 9.8 CRITICAL Junos OS: EX and SRX Series: A PHP vulnerability in J-Web allows an unauthenticated to con
CVE-2023-36846 5.3 MEDIUM Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to uploa
CVE-2023-36847 5.3 MEDIUM Junos OS: EX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-473

V. Comments for CVE-2023-36844

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