CVE-2022-28055 in Fusionpbx
Summary
by MITRE • 05/04/2022
Fusionpbx v4.4 and below contains a command injection vulnerability via the download email logs function.
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Analysis
by VulDB Data Team • 05/07/2022
The vulnerability identified as CVE-2022-28055 affects Fusionpbx versions 4.4 and earlier, presenting a critical command injection flaw within the email logs download functionality. This issue arises from inadequate input validation and sanitization mechanisms that fail to properly handle user-supplied data in the context of email log retrieval operations. The vulnerability specifically manifests when the system processes parameters related to email log downloads, allowing malicious actors to inject arbitrary commands that execute within the system's operational context. The flaw represents a significant security weakness that could enable attackers to gain unauthorized access to system resources and potentially achieve full system compromise.
The technical implementation of this vulnerability stems from improper handling of user inputs within the download email logs function, which operates under CWE-77 principle of command injection. When users attempt to download email logs through the web interface, the application fails to adequately sanitize or validate the parameters passed to underlying system commands. This allows attackers to inject malicious command sequences that bypass normal input validation checks. The vulnerability operates at the application layer and can be exploited through web-based interfaces, making it particularly dangerous as it requires no special privileges or access to system-level resources beyond initial web application access. The flaw aligns with ATT&CK technique T1059.001 for command and script injection, demonstrating how seemingly benign application functions can become attack vectors when proper security controls are absent.
The operational impact of this vulnerability extends beyond simple data theft or system disruption, as it provides attackers with potential for arbitrary code execution and system compromise. Successful exploitation could enable attackers to execute commands with the privileges of the web application user, potentially leading to complete system takeover. Attackers might leverage this vulnerability to establish persistent access, escalate privileges, or use the compromised system as a launch point for further attacks within the network infrastructure. The email logs functionality typically involves system-level operations that may include file system access, process execution, and network communication, all of which become attack surfaces when command injection occurs. Organizations using Fusionpbx versions 4.4 and earlier face significant risk of unauthorized access, data exfiltration, and potential disruption of telephony services that depend on the platform.
Mitigation strategies for CVE-2022-28055 should prioritize immediate remediation through patching to the latest stable Fusionpbx versions that address the command injection vulnerability. Organizations should implement comprehensive input validation and sanitization measures within the email logs download functionality, ensuring that all user-supplied parameters undergo rigorous filtering before any system commands are executed. Network segmentation and access controls should be strengthened to limit exposure of the vulnerable application to untrusted networks or users. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities within the application stack. The implementation of web application firewalls and runtime application self-protection mechanisms can provide additional layers of defense against command injection attacks. Security monitoring should include detection of anomalous command execution patterns and unusual network activity that might indicate exploitation attempts. Organizations should also establish proper incident response procedures to quickly address any potential exploitation attempts and maintain comprehensive audit logs to track system activities related to email log downloads.