CVE-2011-0437 in Domain Technologie Control
Summary
by MITRE
shared/inc/sql/ssh.php in the SSH accounts management implementation in Domain Technologie Control (DTC) before 0.32.9 allows remote authenticated users to delete arbitrary accounts via the edssh_account parameter in a deletesshaccount Delete action.
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Analysis
by VulDB Data Team • 10/19/2021
The vulnerability identified as CVE-2011-0437 resides within the Domain Technologie Control (DTC) software suite, specifically in the SSH account management functionality. This issue affects versions prior to 0.32.9 and represents a critical authorization flaw that enables remote authenticated attackers to execute unauthorized account deletion operations. The vulnerability manifests in the shared/inc/sql/ssh.php file where the edssh_account parameter is improperly validated during the deletesshaccount Delete action. This allows malicious users with valid authentication credentials to manipulate the parameter and target arbitrary SSH accounts for deletion, bypassing normal access controls and account management protocols.
The technical flaw stems from insufficient input validation and parameter sanitization within the SSH account deletion mechanism. When an authenticated user submits a request to delete an SSH account through the deletesshaccount action, the system fails to properly verify whether the requesting user has authorization to delete the specified account. The edssh_account parameter, which should contain the identifier of the account to be deleted, is directly processed without adequate authorization checks or validation against the user's privileges. This represents a classic authorization bypass vulnerability that falls under CWE-285, which addresses insufficient authorization in software implementations.
The operational impact of this vulnerability extends beyond simple account deletion, as it can severely compromise system security and integrity. An attacker with legitimate authentication credentials can leverage this flaw to remove SSH accounts belonging to other users, potentially disrupting legitimate access, destroying audit trails, and creating unauthorized access points. The vulnerability also enables potential denial of service scenarios where critical administrative accounts could be deleted, rendering systems inaccessible to authorized personnel. This type of vulnerability aligns with ATT&CK technique T1531 which focuses on Account Access Removal, and T1078 which covers Valid Accounts as a means to maintain persistent access.
Mitigation strategies for CVE-2011-0437 should prioritize immediate patching of affected DTC installations to version 0.32.9 or later, which contains the necessary security fixes. Organizations should implement proper input validation and parameter sanitization measures to ensure that all account deletion requests undergo strict authorization verification. The system should enforce mandatory access controls that validate user permissions against target accounts before executing deletion operations. Additional security measures include implementing audit logging for all account deletion activities, establishing role-based access controls, and conducting regular security assessments of web application components. Network segmentation and monitoring should be enhanced to detect unusual deletion patterns and unauthorized account modifications. The vulnerability also underscores the importance of following secure coding practices and conducting regular security reviews of authentication and authorization mechanisms to prevent similar flaws in other components of the system architecture.