CVE-2018-2478 in TREX
Summary
by MITRE
An attacker can use specially crafted inputs to execute commands on the host of a TREX / BWA installation, SAP Basis, versions: 7.0 to 7.02, 7.10 to 7.11, 7.30, 7.31, 7.40 and 7.50 to 7.53. Not all commands are possible, only those that can be executed by the <sid>adm user. The commands executed depend upon the privileges of the <sid>adm user.
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Analysis
by VulDB Data Team • 04/12/2020
The vulnerability identified as CVE-2018-2478 represents a critical command injection flaw within SAP Basis installations, specifically affecting TREX and BWA components across multiple SAP system versions. This security weakness stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied data before processing within the system's command execution pathways. The vulnerability exists in SAP Basis versions ranging from 7.0 through 7.02, 7.10 through 7.11, 7.30, 7.31, 7.40, and 7.50 through 7.53, creating a widespread impact across numerous legacy SAP deployments. The flaw manifests when specially crafted inputs are processed by the system, allowing unauthorized command execution on the host operating system where the SAP application is installed. This vulnerability directly maps to CWE-78, which describes improper neutralization of special elements used in OS commands, commonly known as OS command injection. The attack vector leverages the system's trust in user inputs without sufficient validation, enabling malicious actors to bypass normal access controls and execute arbitrary commands with the privileges of the system's SAP administrator account.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with significant control over the underlying host environment where SAP applications operate. The commands that can be executed are strictly limited to those that the <sid>adm user possesses privileges to run, meaning the attack's effectiveness depends entirely on the security configuration and access rights assigned to this administrative account. This constraint does not diminish the severity of the vulnerability but rather highlights the potential for lateral movement and privilege escalation within the SAP ecosystem. Attackers who successfully exploit this vulnerability can potentially access sensitive data, modify system configurations, install malicious software, or disrupt business operations. The vulnerability's presence in multiple SAP Basis versions suggests that organizations with legacy systems may face prolonged exposure, as patches and updates might not be immediately deployed across all system components. The implications align with ATT&CK technique T1059, which covers command and scripting interpreter, specifically targeting the execution of commands through legitimate system interfaces.
Organizations affected by CVE-2018-2478 must implement immediate mitigations to protect their SAP environments from exploitation. The primary recommendation involves applying the relevant SAP security patches and updates released by SAP to address this specific command injection vulnerability. Additionally, implementing network segmentation and access controls can limit the attack surface by restricting direct access to SAP system components from untrusted networks. Input validation mechanisms should be strengthened at multiple layers, including application-level sanitization of user inputs and the implementation of proper parameterized queries to prevent malicious command injection attempts. Security monitoring should be enhanced to detect unusual command execution patterns or unauthorized access attempts to SAP administrative interfaces. The vulnerability's nature requires organizations to conduct thorough security assessments of their SAP installations, particularly focusing on the privilege levels assigned to <sid>adm accounts and ensuring that these accounts maintain the minimum necessary permissions. Regular security audits and vulnerability scanning should be implemented to identify similar weaknesses across the entire SAP landscape, as this vulnerability may indicate broader security gaps in system configuration and input handling practices.