CVE-2025-26318 in Remote Access
Summary
by MITRE • 03/04/2025
Insecure permissions in TSplus Remote Access v17.30 allow attackers to retrieve a list of all domain accounts currently connected to the application.
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Analysis
by VulDB Data Team • 06/02/2025
CVE-2025-26318 represents a critical access control vulnerability within TSplus Remote Access version 17.30 that exposes sensitive authentication information to unauthorized actors. This vulnerability stems from improper permission controls within the application's authentication subsystem, specifically affecting how the system handles domain account enumeration requests. The flaw allows attackers to bypass normal authentication barriers and access lists of currently connected domain accounts through unauthenticated or low-privilege access points. This type of information disclosure vulnerability is classified under CWE-284 Access Control Issues, where the system fails to properly enforce access restrictions for sensitive data. The vulnerability directly impacts the principle of least privilege by allowing unauthorized users to obtain information about legitimate domain accounts that are actively connected to the remote access infrastructure.
The technical implementation of this vulnerability occurs at the application layer where domain account enumeration functionality is improperly protected. Attackers can exploit this weakness by sending crafted requests to the TSplus service that trigger account listing responses without requiring proper authentication credentials. The system's failure to validate access permissions before returning account information creates an information disclosure channel that can be leveraged for further attacks. This vulnerability aligns with ATT&CK technique T1087.001 Account Discovery: Local Account, as it enables adversaries to identify active domain accounts within the target environment. The flaw exists in the service's request handling mechanism where authentication checks are either absent or insufficiently enforced for account enumeration functions.
The operational impact of CVE-2025-26318 extends beyond simple information disclosure, creating potential pathways for more sophisticated attacks within the compromised environment. An attacker who successfully exploits this vulnerability gains knowledge of active domain accounts that can be used for targeted credential harvesting, social engineering campaigns, or as a foundation for privilege escalation attempts. The exposure of connected domain accounts provides attackers with valuable intelligence about user activity patterns and potentially reveals which accounts are actively in use within the organization. This information can significantly reduce the effectiveness of security controls by enabling attackers to focus their efforts on accounts that are currently active and potentially have elevated privileges. The vulnerability particularly affects organizations that rely heavily on domain-based authentication and remote access solutions, where the exposure of account connectivity information can lead to cascading security failures.
Organizations should immediately implement mitigations that include strengthening access controls for the TSplus application, implementing network segmentation to limit access to the remote access infrastructure, and conducting comprehensive access reviews of the affected system. The most effective immediate remediation involves applying the vendor-provided patch or upgrade to version 17.31 or later, which addresses the permission enforcement flaws in the authentication subsystem. Additionally, administrators should implement monitoring solutions that can detect unusual account enumeration requests and establish alerting mechanisms for unauthorized access attempts to sensitive system functions. Network-level controls such as firewall rules and access control lists should be configured to restrict access to TSplus services to only authorized network segments and user groups. The vulnerability demonstrates the importance of proper input validation and access control implementation as outlined in security standards such as NIST SP 800-53 and ISO 27001, which emphasize the need for robust authentication and authorization mechanisms to prevent unauthorized information disclosure.