CVE-2006-4429 in PHlyMail Lite
Summary
by MITRE
** DISPUTED ** PHP remote file inclusion vulnerability in handlers/email/mod.output.php in PHlyMail Lite 3.4.4 and earlier (Build 3.04.04) allows remote attackers to execute arbitrary PHP code via a URL in the _PM_[path][handler] parameter, a different vector than CVE-2006-4291. NOTE: This issue has been disputed by a third party, who states that the _IN_PHM_ declaration prevents this file from being called directly.
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Analysis
by VulDB Data Team • 08/08/2024
The vulnerability described in CVE-2006-4429 represents a remote file inclusion flaw within PHlyMail Lite version 3.4.4 and earlier installations. This security weakness specifically affects the email handler component located at handlers/email/mod.output.php, creating a potential pathway for malicious actors to execute arbitrary PHP code on affected systems. The vulnerability operates through the manipulation of the PM[path][handler] parameter, which when supplied with a malicious URL, can trigger the inclusion of remote files containing harmful code. This particular vector differs from CVE-2006-4291, indicating a distinct attack surface within the application's architecture. The issue is classified as a remote code execution vulnerability that could allow attackers to gain unauthorized control over affected servers and potentially compromise the entire system infrastructure.
The technical implementation of this vulnerability stems from improper input validation within the PHlyMail Lite application's handling of user-supplied parameters. When the PM[path][handler] parameter is processed without adequate sanitization, the application fails to verify the legitimacy of the URL provided, allowing attackers to inject external resources that will be executed within the context of the web server. This flaw aligns with CWE-98, which describes improper file inclusion vulnerabilities that permit attackers to include and execute arbitrary files from remote locations. The vulnerability demonstrates a classic lack of input validation and output encoding that enables attackers to manipulate application flow and execute malicious code remotely. The attack requires no authentication and can be exploited through simple HTTP requests, making it particularly dangerous for publicly accessible web applications.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with complete control over affected systems. Successful exploitation could result in data breaches, system compromise, and potential lateral movement within network environments. Attackers could use this vulnerability to install backdoors, steal sensitive information, modify system configurations, or deploy additional malware. The remote nature of the attack means that threat actors do not need physical access to the target system, and the vulnerability affects any organization running affected PHlyMail Lite versions. Organizations with web applications containing similar flaws face significant risk, as this vulnerability could be leveraged as part of larger attack campaigns targeting web infrastructure. The implications are particularly severe in environments where PHlyMail Lite serves as a critical email handling component for business operations.
Mitigation strategies for this vulnerability require immediate action to address the core issue in the application's parameter handling. Organizations should upgrade to patched versions of PHlyMail Lite where available, as this represents the most effective long-term solution. Additionally, implementing input validation measures at the application level can help prevent malicious URLs from being processed, while web application firewalls can provide additional layers of protection by filtering suspicious parameter values. Security configurations should include disabling remote file inclusion features and implementing strict validation of all user-supplied inputs. The ATT&CK framework categorizes this type of vulnerability under T1190, which describes exploitation of remote services, and T1059, which covers execution through scripting. Regular security assessments and vulnerability scanning should be conducted to identify similar flaws in other applications, as this vulnerability pattern is common in legacy web applications. Organizations should also consider implementing network segmentation and monitoring to detect suspicious activities that might indicate exploitation attempts.