CVE-2020-25849 in MailGates
Summary
by MITRE • 11/01/2020
MailGates and MailAudit products contain Command Injection flaw, which can be used to inject and execute system commands from the cgi parameter after attackers obtain the user’s access token.
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Analysis
by VulDB Data Team • 11/30/2020
The vulnerability identified as CVE-2020-25849 represents a critical command injection flaw within MailGates and MailAudit security products, exposing organizations to significant operational risks. This vulnerability specifically affects web-based interfaces that process user input through the cgi parameter, creating an attack vector where malicious actors can execute arbitrary system commands on affected servers. The flaw stems from insufficient input validation and sanitization mechanisms within the web application's command processing logic, allowing attackers to manipulate parameter values and inject malicious command sequences that bypass normal security controls.
The technical implementation of this vulnerability aligns with CWE-77, which categorizes command injection as a serious weakness in software applications that permit command execution through user-controllable input. Attackers exploit this flaw by obtaining a valid user access token through various means such as credential theft, session hijacking, or other initial compromise techniques, then leveraging the cgi parameter to inject malicious commands that execute with the privileges of the web application process. This typically results in the attacker gaining unauthorized access to underlying system resources, potentially enabling full system compromise or data exfiltration.
The operational impact of CVE-2020-25849 extends beyond immediate system compromise, as it can facilitate lateral movement within networks and provide attackers with persistent access to critical email infrastructure. Organizations utilizing these MailGates and MailAudit products face potential exposure to advanced persistent threats where attackers can establish backdoors, modify email routing rules, access sensitive communications, or deploy additional malware. The vulnerability's exploitation can lead to complete loss of email security controls, making it particularly dangerous for enterprises that rely heavily on email as a primary communication channel and security monitoring tool.
Mitigation strategies for this vulnerability should address both immediate remediation and long-term security hardening measures. Organizations must prioritize applying vendor patches and updates as soon as they become available, while also implementing network segmentation to limit access to affected web interfaces. Input validation controls should be strengthened through proper parameter sanitization, output encoding, and the implementation of secure coding practices that prevent command injection attacks. Additionally, access controls should be enforced through multi-factor authentication, regular session management, and monitoring for anomalous command execution patterns that could indicate exploitation attempts. This vulnerability demonstrates the importance of adhering to ATT&CK framework principles for defensive measures, particularly in the execution and privilege escalation phases of the attack lifecycle, where command injection serves as a critical initial access vector for attackers seeking to establish persistent presence within target environments.