CVE-2011-3172 in Linux Enterprise
Summary
by MITRE
A vulnerability in pam_modules of SUSE SUSE Linux Enterprise allows attackers to log into accounts that should have been disabled. Affected releases are SUSE SUSE Linux Enterprise: versions prior to 12.
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Analysis
by VulDB Data Team • 03/22/2023
The vulnerability identified as CVE-2011-3172 represents a critical authentication flaw within the pluggable authentication modules framework of SUSE Linux Enterprise systems. This weakness specifically affects the pam_modules component which serves as a crucial interface for authentication and authorization processes in Unix-like operating systems. The vulnerability stems from improper handling of disabled account states within the authentication pipeline, creating a scenario where malicious actors can bypass account disabling mechanisms and gain unauthorized access to systems.
The technical root cause of this vulnerability lies in the insufficient validation of account status during the authentication process within the pam_modules framework. When an account is disabled through standard administrative procedures, the system should reject authentication attempts from that account. However, the flaw in SUSE Linux Enterprise versions prior to 12 allows the authentication module to accept login requests from disabled accounts, effectively neutralizing the account disabling functionality. This represents a direct violation of fundamental security principles where account management controls are circumvented through improper state validation within the authentication subsystem. The vulnerability manifests as a failure in access control enforcement, which aligns with CWE-284 access control violations.
The operational impact of CVE-2011-3172 extends beyond simple unauthorized access, creating potential for broader security compromise within affected systems. Attackers exploiting this vulnerability can maintain persistent access to disabled accounts, potentially enabling them to escalate privileges, conduct data exfiltration, or establish backdoors within the compromised environment. The flaw particularly affects systems where account disabling is used as a security control, such as when employees leave organizations or when accounts are compromised and need immediate deactivation. This vulnerability undermines the integrity of the authentication system and can lead to cascading security issues when combined with other weaknesses in the system architecture. The impact is particularly severe in enterprise environments where proper account lifecycle management is critical for maintaining security postures.
Mitigation strategies for CVE-2011-3172 require immediate system updates and configuration reviews to address the underlying authentication flaw. Organizations should prioritize upgrading to SUSE Linux Enterprise 12 or later versions where this vulnerability has been resolved through proper account state validation in the pam_modules implementation. System administrators should also implement additional monitoring controls to detect unauthorized access attempts from previously disabled accounts and conduct thorough account reviews to identify any potential exploitation. The remediation process should include verifying that account disabling mechanisms function correctly and that authentication logs properly reflect account status. This vulnerability demonstrates the importance of maintaining current system patches and implementing robust account management policies, as outlined in security frameworks such as those referenced in the MITRE ATT&CK framework for credential access techniques. Organizations should also consider implementing additional authentication controls such as multi-factor authentication to provide defense in depth against potential exploitation of similar authentication bypass vulnerabilities.