CVE-2007-2692 in mysql
Summary
by MITRE
The mysql_change_db function in MySQL 5.0.x before 5.0.40 and 5.1.x before 5.1.18 does not restore THD::db_access privileges when returning from SQL SECURITY INVOKER stored routines, which allows remote authenticated users to gain privileges.
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Analysis
by VulDB Data Team • 07/19/2019
The vulnerability identified as CVE-2007-2692 represents a critical privilege escalation flaw within the MySQL database management system affecting versions prior to specific patches. This issue resides in the mysql_change_db function which is responsible for handling database context changes within the server's execution environment. The flaw specifically manifests when transitioning between different database contexts during the execution of stored procedures that utilize SQL SECURITY INVOKER, a feature that allows routines to execute with the privileges of the user who invoked them rather than the routine's creator.
The technical root cause of this vulnerability stems from improper privilege management during stored procedure execution flows. When a user executes a stored routine with SQL SECURITY INVOKER, the MySQL server should maintain proper privilege boundaries and restore the original access context upon routine completion. However, the mysql_change_db function fails to correctly restore the THD::db_access privileges that were active before entering the routine context. This privilege leakage creates an opportunity for authenticated attackers to escalate their privileges within the database system.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to bypass security controls that are normally enforced within the database environment. An authenticated user who can execute stored procedures with SQL SECURITY INVOKER can potentially manipulate their access rights to gain unauthorized access to database objects, execute privileged operations, or access data that should be restricted to higher-privileged users. This vulnerability affects the fundamental security model of MySQL's privilege system and can be exploited by users with minimal database access to achieve elevated privileges.
This vulnerability maps directly to CWE-284 Access Control Issues, specifically representing a weakness in privilege management and access control enforcement. The flaw also aligns with ATT&CK technique T1078 Valid Accounts, as it allows attackers to leverage legitimate authenticated accounts to escalate privileges within the database environment. The attack vector requires a user to have authentication credentials and the ability to create or execute stored procedures, which are common permissions in database environments. Organizations running affected MySQL versions face significant risk as this vulnerability can be exploited by both internal and external attackers who have gained basic database access.
Mitigation strategies for CVE-2007-2692 involve immediate patching of MySQL installations to versions 5.0.40 or later and 5.1.18 or later, which contain the necessary fixes for privilege restoration in stored procedure contexts. Database administrators should also implement strict access controls and monitoring for stored procedure creation and execution, particularly for routines using SQL SECURITY INVOKER. Additionally, organizations should conduct comprehensive audits of existing stored procedures to identify those that may be vulnerable to this privilege escalation attack and implement proper privilege separation measures. Regular security assessments and vulnerability scanning should be conducted to identify any remaining instances of this vulnerability across the database infrastructure.