CVE-2012-0811 in Postfix
Summary
by MITRE
Multiple SQL injection vulnerabilities in Postfix Admin (aka postfixadmin) before 2.3.5 allow remote authenticated users to execute arbitrary SQL commands via (1) the pw parameter to the pacrypt function, when mysql_encrypt is configured, or (2) unspecified vectors that are used in backup files generated by backup.php.
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Analysis
by VulDB Data Team • 03/29/2022
The vulnerability CVE-2012-0811 represents a critical security flaw in Postfix Admin, a widely used web-based administration interface for Postfix mail servers. This vulnerability affects versions prior to 2.3.5 and exposes the system to remote authenticated SQL injection attacks that can lead to complete database compromise. The flaw stems from inadequate input validation and sanitization within the application's handling of user-supplied data, particularly in the context of password encryption and backup file processing. The vulnerability is particularly concerning because it allows authenticated users to escalate their privileges and execute arbitrary SQL commands against the underlying database, potentially leading to data exfiltration, modification, or complete system compromise.
The technical implementation of this vulnerability manifests in two distinct attack vectors that exploit different components of the Postfix Admin application. The first vector involves the pw parameter within the pacrypt function when mysql_encrypt is configured, where user-provided password data is directly incorporated into SQL queries without proper sanitization. This creates an environment where malicious input can manipulate the SQL execution flow and inject additional commands. The second vector operates through backup files generated by backup.php, where unspecified input handling mechanisms allow for SQL injection when these backup files are processed. Both attack paths fall under the CWE-89 category of SQL Injection, specifically targeting the application's database interaction layer where user input is improperly escaped or validated before being used in database queries.
The operational impact of CVE-2012-0811 extends beyond simple data theft, as authenticated attackers can leverage these vulnerabilities to gain deeper system access and potentially establish persistence. The vulnerability affects the integrity and confidentiality of email server configurations, user credentials, and email routing information stored in the database. Attackers can exploit these flaws to enumerate database schemas, extract sensitive information including user passwords, modify email configurations, or even delete critical system data. The authenticated nature of the attack means that an attacker must first obtain valid credentials, but this is often achievable through other means such as credential theft, weak password policies, or social engineering attacks. This vulnerability directly aligns with ATT&CK technique T1078 for Valid Accounts and T1046 for Network Service Scanning, as attackers can use compromised accounts to explore and exploit the SQL injection flaws.
Mitigation strategies for CVE-2012-0811 primarily focus on immediate remediation through software updates and input validation improvements. Organizations should prioritize upgrading to Postfix Admin version 2.3.5 or later, which includes proper input sanitization and parameterized query implementations. The recommended approach involves implementing proper input validation for all user-supplied parameters, particularly those used in database operations. Additionally, organizations should employ prepared statements or parameterized queries throughout the application codebase to prevent SQL injection vulnerabilities. Database access controls should be reviewed and restricted to minimize the impact of potential exploitation, ensuring that database accounts used by Postfix Admin have minimal required privileges. Network segmentation and monitoring should be implemented to detect unusual database access patterns that might indicate exploitation attempts, while also enforcing strong authentication mechanisms and credential policies to reduce the likelihood of unauthorized account access.