CVE-2022-22793 in PineApp
Summary
by MITRE • 02/24/2022
Cybonet - PineApp Mail Relay Local File Inclusion. Attacker can send a request to : /manage/mailpolicymtm/log/eml_viewer/email.content.body.php?filesystem_path=ENCDODED PATH and by doing that, the attacker can read Local Files inside the server.
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Analysis
by VulDB Data Team • 02/26/2022
The vulnerability identified as CVE-2022-22793 affects the Cybonet PineApp Mail Relay system, representing a critical local file inclusion flaw that enables unauthorized file access on the affected server. This vulnerability exists within the email policy management component of the PineApp Mail Relay platform, specifically in the eml_viewer module where the email.content.body.php script processes filesystem_path parameters without adequate input validation or sanitization. The flaw allows attackers to manipulate the filesystem_path parameter through a crafted HTTP request directed to the /manage/mailpolicymtm/log/eml_viewer/email.content.body.php endpoint, potentially enabling arbitrary file reading capabilities.
The technical implementation of this vulnerability stems from improper input validation within the web application's request handling mechanism, which directly incorporates user-supplied data into filesystem operations. This represents a classic local file inclusion vulnerability classified under CWE-22 as "Improper Limitation of a Pathname to a Restricted Directory." The vulnerability operates by accepting encoded filesystem paths through the filesystem_path parameter and subsequently processing these paths without proper sanitization or access control checks. Attackers can leverage this flaw to read sensitive files from the server's filesystem, potentially accessing configuration files, log files, or other system resources that should remain protected from unauthorized access.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can enable attackers to gain insights into the system's internal structure and potentially extract sensitive data that could aid in further exploitation attempts. The ability to read local files may expose database connection strings, administrative credentials, system configuration details, or other sensitive information that could be used for privilege escalation or lateral movement within the network. This vulnerability directly aligns with ATT&CK technique T1213.002 for "Data from Information Repositories" and could potentially support techniques such as credential access and privilege escalation depending on what files are accessible through the compromised path traversal mechanism.
Mitigation strategies for CVE-2022-22793 should focus on implementing proper input validation and sanitization mechanisms within the affected application components. The most effective immediate fix involves implementing strict input validation that rejects or sanitizes any input containing path traversal sequences such as ../ or ..\ characters, while also implementing proper access controls that restrict file access to authorized users only. Organizations should also consider implementing web application firewalls that can detect and block malicious path traversal attempts, along with regular security audits of web applications to identify similar vulnerabilities. Additionally, the principle of least privilege should be enforced by ensuring that the web application operates with minimal required permissions and that file access is restricted to necessary directories only. System administrators should also implement proper logging and monitoring of file access patterns to detect potential exploitation attempts. The vulnerability underscores the importance of secure coding practices and input validation as outlined in OWASP Top Ten and ISO/IEC 27001 security standards, emphasizing that proper parameter validation and access control mechanisms are essential to prevent such critical vulnerabilities from being exploited in production environments.