CVE-2020-6253 in Adaptive Server Enterprise
Summary
by MITRE
Under certain conditions, SAP Adaptive Server Enterprise (Web Services), versions 15.7, 16.0, allows an authenticated user to execute crafted database queries to elevate their privileges, modify database objects, or execute commands they are not otherwise authorized to execute, leading to SQL Injection.
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Analysis
by VulDB Data Team • 10/16/2020
SAP Adaptive Server Enterprise represents a critical database management system widely deployed in enterprise environments, particularly within financial services and manufacturing sectors. The vulnerability identified as CVE-2020-6253 specifically targets the Web Services component of this database platform, affecting versions 15.7 and 16.0. This flaw exists within the application's handling of database queries through web service interfaces, creating a pathway for authenticated users to exploit weaknesses in input validation and query construction. The vulnerability stems from inadequate sanitization of user-supplied data when processing web service requests, allowing malicious input to be interpreted as part of the database command rather than as literal data. This issue particularly affects environments where web services are enabled and used for database operations, as the vulnerability requires authentication to exploit, limiting its scope to internal threats rather than external attacks. The affected system components include the query processing engine within the Web Services framework, where user inputs are not properly escaped or validated before being incorporated into dynamic SQL statements.
The technical exploitation of this vulnerability follows a classic SQL injection pattern where an authenticated user crafts malicious input that bypasses normal input validation mechanisms. When the web service processes these crafted inputs, the system fails to properly separate user data from executable commands, allowing attackers to inject additional SQL commands into the query execution flow. This flaw specifically manifests when database queries are constructed dynamically using user-provided parameters without proper sanitization or parameterization. The vulnerability is categorized under CWE-89 as SQL Injection, which represents one of the most prevalent and dangerous web application security flaws. Attackers can leverage this weakness to escalate privileges within the database environment, potentially gaining access to sensitive data, modifying critical database objects, or executing arbitrary commands on the underlying database server. The attack vector requires that the user already possesses valid credentials, making this a privilege escalation vulnerability rather than an initial access flaw. This characteristic means that the vulnerability is typically exploited by insider threats or compromised accounts rather than external attackers, though the impact remains severe due to the elevated privileges that can be achieved.
The operational impact of CVE-2020-6253 extends beyond simple data theft to encompass complete database compromise and potential system-wide damage. Organizations using affected SAP ASE versions face significant risks including unauthorized data modification, privilege escalation to administrative levels, and potential command execution capabilities that could allow attackers to gain deeper system access. The vulnerability's presence in the Web Services component means that any application or service relying on SAP ASE web services could be compromised, potentially affecting business-critical applications that depend on database operations. Attackers can exploit this vulnerability to manipulate database contents, create backdoor accounts, or extract sensitive information that could lead to further security breaches. The impact is particularly concerning in regulated environments where database integrity and audit trails are critical for compliance. Additionally, the vulnerability can facilitate lateral movement within networks where SAP ASE systems are integrated with other enterprise applications, potentially allowing attackers to pivot to other systems. The complexity of database environments means that the full scope of potential damage may not be immediately apparent, as the vulnerability could enable attackers to discover other weaknesses in the system architecture.
Mitigation strategies for CVE-2020-6253 require immediate action from organizations utilizing affected SAP ASE versions. The primary recommended approach involves applying the relevant SAP security patches and updates that address the SQL injection vulnerability in the Web Services component. Organizations should also implement network segmentation and access controls to limit the scope of potential exploitation, ensuring that only necessary services are exposed to trusted networks. Database administrators should review and restrict user permissions, implementing the principle of least privilege to minimize the potential impact of successful exploitation attempts. Input validation mechanisms should be strengthened across all web service interfaces, with proper parameterization of database queries to prevent malicious input from being interpreted as executable code. Security monitoring should be enhanced to detect unusual database activity patterns that might indicate exploitation attempts, particularly focusing on privilege escalation activities and unusual query execution patterns. Organizations should also conduct comprehensive vulnerability assessments to identify all instances of affected SAP ASE versions within their environment and prioritize remediation efforts accordingly. The implementation of web application firewalls and database activity monitoring tools can provide additional layers of protection. Regular security training for database administrators and application developers should emphasize secure coding practices and the importance of proper input validation to prevent similar vulnerabilities from emerging in future development cycles.