CVE-2018-20323 in Community Edition
Summary
by MITRE
www/soap/application/MCSoap/Logs.php in MailCleaner Community Edition 2018.08 allows remote attackers to execute arbitrary OS commands.
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Analysis
by VulDB Data Team • 08/03/2023
The vulnerability identified as CVE-2018-20323 represents a critical command injection flaw within the MailCleaner Community Edition version 2018.08. This security weakness resides in the MCSoap/Logs.php file which is part of the web-based soap application interface. The flaw enables remote attackers to execute arbitrary operating system commands on the affected system without requiring authentication or valid session credentials. The vulnerability stems from insufficient input validation and sanitization within the soap application layer, specifically in how user-supplied parameters are processed and passed to underlying system commands. This type of vulnerability falls under the common weakness enumeration CWE-77 which categorizes improper neutralization of special elements used in OS commands, making it particularly dangerous for web applications that interface directly with system-level operations. The attack vector is accessible via remote network connections, meaning an attacker can exploit this vulnerability from anywhere on the internet without requiring physical access to the mail server infrastructure.
The technical exploitation of this vulnerability occurs when an attacker sends specially crafted requests to the vulnerable MCSoap/Logs.php endpoint. The application fails to properly validate or sanitize input parameters that are subsequently used in system command execution contexts. This allows attackers to inject malicious command sequences that get executed with the privileges of the web server process. The impact extends beyond simple command execution as it can potentially lead to full system compromise, data exfiltration, and unauthorized access to sensitive mail server information. The vulnerability is particularly concerning because it affects the community edition of MailCleaner, which is widely deployed in small to medium organizations, making it a prime target for automated exploitation campaigns. According to ATT&CK framework, this vulnerability maps to T1059.001 for command and scripting interpreter and T1068 for exploit for privilege escalation, as attackers can leverage the initial command execution to gain broader system access.
The operational impact of CVE-2018-20323 is severe and multifaceted for organizations using MailCleaner Community Edition. Successful exploitation can result in complete compromise of the mail server infrastructure, allowing attackers to view, modify, or delete email content, access spam and virus quarantines, and potentially use the compromised server as a launch point for further attacks within the network. Organizations may experience data breaches, email spoofing, and disruption of email services that can affect business operations. The vulnerability also poses risks for organizations that rely on MailCleaner for email security filtering, as attackers could bypass security measures or disable protective features. The lack of authentication requirements for exploitation makes this vulnerability particularly dangerous as it can be exploited by anyone with network access to the affected system. Additionally, the presence of this vulnerability may indicate broader security deficiencies in the application's architecture, potentially exposing other components to similar attacks. Organizations should immediately implement mitigations including network segmentation, firewall rules to restrict access to the vulnerable soap endpoints, and application-level input validation measures. The most effective long-term solution involves applying the vendor-provided security patches or upgrading to patched versions of MailCleaner Community Edition.