CVE-2022-22246 in Junos OS
Summary
by MITRE • 10/18/2022
A PHP Local File Inclusion (LFI) vulnerability in the J-Web component of Juniper Networks Junos OS may allow a low-privileged authenticated attacker to execute an untrusted PHP file. By chaining this vulnerability with other unspecified vulnerabilities, and by circumventing existing attack requirements, successful exploitation could lead to a complete system compromise. This issue affects Juniper Networks Junos OS: all versions prior to 19.1R3-S9; 19.2 versions prior to 19.2R3-S6; 19.3 versions prior to 19.3R3-S6; 19.4 versions prior to 19.4R2-S7, 19.4R3-S8; 20.1 versions prior to 20.1R3-S5; 20.2 versions prior to 20.2R3-S5; 20.3 versions prior to 20.3R3-S5; 20.4 versions prior to 20.4R3-S4; 21.1 versions prior to 21.1R3-S2; 21.2 versions prior to 21.2R3-S1; 21.3 versions prior to 21.3R2-S2, 21.3R3; 21.4 versions prior to 21.4R1-S2, 21.4R2-S1, 21.4R3; 22.1 versions prior to 22.1R1-S1, 22.1R2.
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Analysis
by VulDB Data Team • 11/10/2022
The CVE-2022-22246 vulnerability represents a critical PHP Local File Inclusion flaw within the J-Web component of Juniper Networks Junos OS, exposing systems to significant security risks. This vulnerability falls under the Common Weakness Enumeration category CWE-98, which specifically addresses improper file inclusion vulnerabilities where applications include or require files based on user-supplied input without proper validation. The flaw exists in the web-based management interface of Junos OS, which is commonly used by network administrators to configure and manage Juniper network devices. The vulnerability allows a low-privileged authenticated attacker to manipulate PHP file inclusion parameters, enabling them to execute arbitrary PHP code on the target system. This represents a severe escalation path from initial access to potential system compromise, as the attacker can leverage this vulnerability to gain unauthorized control over network infrastructure.
The technical exploitation of this vulnerability requires an authenticated user with minimal privileges, making it particularly dangerous as it can be leveraged by insiders or attackers who have gained limited access to the system. The J-Web interface, which provides web-based management capabilities for Junos OS devices, processes user input through PHP scripts that do not properly sanitize file paths before inclusion. Attackers can manipulate parameters in web requests to point to arbitrary PHP files, potentially including malicious code or system files that could be executed with the privileges of the web server process. This vulnerability is particularly concerning because it operates within the web management plane of network devices, which often have elevated privileges and can access sensitive system information. The attack chain typically involves exploiting the LFI vulnerability to read or execute PHP files, potentially leading to further exploitation through privilege escalation or lateral movement within the network environment.
The operational impact of CVE-2022-22246 extends beyond simple code execution, as it can lead to complete system compromise when combined with other vulnerabilities present in the affected Junos OS versions. According to the ATT&CK framework, this vulnerability maps to multiple techniques including T1059.007 for PHP execution and T1068 for privilege escalation. The vulnerability affects a broad range of Junos OS versions, spanning from 19.1 through 22.1 releases, indicating a prolonged period of exposure across multiple major versions. Network administrators face significant operational challenges as this vulnerability can be exploited to gain persistent access to network infrastructure, potentially enabling attackers to monitor traffic, modify configurations, or use the compromised devices as launch points for attacks against other network segments. The vulnerability's presence in both current and legacy versions means that organizations with extended support cycles or delayed patching processes face prolonged exposure risks.
Organizations affected by CVE-2022-22246 should implement immediate mitigations including applying the vendor-provided patches for all affected Junos OS versions, as specified in the security advisories. The vulnerability can be mitigated through proper input validation and sanitization of user-supplied parameters within the J-Web interface, preventing attackers from manipulating file inclusion paths. Network segmentation and access controls should be reinforced to limit the impact of potential exploitation, particularly by implementing least privilege principles for web management access. Regular security assessments should include verification of the J-Web component's configuration and monitoring for suspicious file inclusion attempts. The vulnerability's exploitation potential aligns with ATT&CK technique T1190 for exploiting web application vulnerabilities, making it a high-priority target for both defensive and offensive security teams. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability pattern, as the attack vectors often involve predictable parameter manipulation and file path inclusion patterns that can be detected through behavioral analysis.