CVE-2020-8253 in XenMobile Server
Summary
by MITRE
Improper authentication in Citrix XenMobile Server 10.12 before RP2, Citrix XenMobile Server 10.11 before RP4, Citrix XenMobile Server 10.10 before RP6 and Citrix XenMobile Server before 10.9 RP5 leads to the ability to access sensitive files.
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Analysis
by VulDB Data Team • 09/19/2020
The vulnerability identified as CVE-2020-8253 represents a critical authentication flaw in Citrix XenMobile Server versions prior to specific release patches. This weakness allows unauthorized access to sensitive system files through improper authentication mechanisms that fail to adequately validate user credentials or session integrity. The affected versions include Citrix XenMobile Server 10.12 before RP2, 10.11 before RP4, 10.10 before RP6, and versions before 10.9 RP5, indicating a widespread issue affecting multiple release branches of the platform.
The technical flaw manifests as a failure in the authentication process where the system does not properly verify user identity before granting access to protected resources. This vulnerability falls under the CWE-287 category of Improper Authentication, which is classified as a critical weakness in software security. The authentication bypass occurs at the application layer where legitimate access controls are circumvented, allowing attackers to gain unauthorized access to sensitive data and system resources without proper authorization. The flaw likely stems from insufficient input validation, weak session management, or improper credential verification mechanisms within the XenMobile Server architecture.
The operational impact of this vulnerability is severe as it enables attackers to access sensitive files that should be protected by proper authentication mechanisms. This includes potentially sensitive configuration data, user credentials, system logs, and other confidential information that could be exploited for further attacks. The vulnerability creates a persistent backdoor that can be leveraged by threat actors to escalate privileges, conduct data exfiltration, or establish persistent access to the affected systems. Organizations using these vulnerable versions face significant risk of data breaches and compromise of their mobile device management infrastructure.
Mitigation strategies for CVE-2020-8253 primarily involve applying the vendor-supplied patches and updates for the affected Citrix XenMobile Server versions. Organizations should immediately upgrade to the patched releases mentioned in the advisory, specifically RP2 for 10.12, RP4 for 10.11, RP6 for 10.10, and RP5 for 10.9. Additionally, implementing network segmentation and access controls can help limit the attack surface, while monitoring for unusual authentication attempts and file access patterns can aid in detecting potential exploitation attempts. Security teams should also consider implementing multi-factor authentication mechanisms and regular security assessments to strengthen overall system resilience against similar vulnerabilities. This vulnerability aligns with ATT&CK technique T1078 for Valid Accounts and T1005 for Data from Local System, highlighting the need for comprehensive access control measures and monitoring capabilities.