CVE-2019-15746 in Six
Summary
by MITRE
SITOS six Build v6.2.1 allows an attacker to inject arbitrary PHP commands. As a result, an attacker can compromise the running server and execute system commands in the context of the web user.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 01/03/2024
The vulnerability identified as CVE-2019-15746 affects SITOS six Build version 6.2.1, representing a critical remote code execution flaw that stems from insufficient input validation and sanitization within the application's command processing mechanisms. This vulnerability exists in the web application's handling of user-supplied data that is directly incorporated into system command execution contexts without proper sanitization or escaping, creating an avenue for malicious actors to inject arbitrary PHP code that gets executed on the target server.
The technical flaw manifests when the application fails to properly validate or sanitize input parameters that are subsequently used in system command invocations or PHP execution contexts. This type of vulnerability falls under the CWE-94 category known as "Improper Control of Generation of Code ('Code Injection')" and aligns with ATT&CK technique T1059.007 for "Command and Scripting Interpreter: PowerShell" and T1059.006 for "Command and Scripting Interpreter: Python" when such injections occur in web contexts. The vulnerability allows an attacker to inject PHP code that executes within the context of the web server user, potentially granting full control over the affected system and enabling further lateral movement within the network.
The operational impact of this vulnerability is severe as it provides attackers with complete server compromise capabilities, enabling them to execute arbitrary system commands, access sensitive data, modify system configurations, and potentially establish persistence mechanisms. The attack surface is particularly concerning because it operates at the web user context level, which may have elevated privileges depending on the server configuration. Successful exploitation allows attackers to perform actions such as file system manipulation, database access, network reconnaissance, and privilege escalation, making this vulnerability particularly attractive for threat actors seeking long-term access to target environments.
Mitigation strategies should focus on immediate input validation and sanitization improvements, including implementing proper escaping mechanisms for all user-supplied data that may be used in system command contexts. Organizations should deploy web application firewalls to detect and block suspicious payload patterns, apply the latest security patches provided by SITOS, and implement principle of least privilege for web server accounts. The remediation process must include comprehensive code reviews to identify similar injection points throughout the application, implementing proper output encoding for all dynamic content, and establishing robust logging and monitoring capabilities to detect potential exploitation attempts. Additionally, network segmentation and access controls should be enforced to limit the potential damage from successful exploitation, while regular security assessments should be conducted to identify and remediate similar vulnerabilities in the application's codebase.