CVE-2020-4138 in SiteProtector Appliance
Summary
by MITRE • 07/11/2022
IBM SiteProtector Appliance 3.1.1 allows web pages to be stored locally which can be read by another user on the system. IBM X-Force ID: 174049.
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Analysis
by VulDB Data Team • 07/21/2022
The vulnerability identified as CVE-2020-4138 affects the IBM SiteProtector Appliance version 3.1.1, representing a critical information disclosure flaw that undermines the system's security model. This issue stems from inadequate access controls and improper file handling mechanisms within the appliance's web interface, creating a scenario where web content stored locally can be accessed by unauthorized users. The vulnerability specifically targets the appliance's local storage functionality, which is designed to cache web pages for performance optimization but fails to implement proper user isolation mechanisms. Attackers can exploit this weakness to gain access to sensitive data that should remain restricted to specific user sessions or administrative contexts, fundamentally compromising the confidentiality assurances typically expected from enterprise security appliances.
The technical root cause of this vulnerability lies in the appliance's failure to enforce proper file system permissions and access controls when storing web content locally. When web pages are cached or stored within the appliance's local storage area, the system does not adequately separate storage contexts between different users or sessions. This design flaw creates a path for privilege escalation and unauthorized data access, as files created by one user can be read by another user with access to the same system. The vulnerability manifests when the appliance's web server component stores cached content in a shared directory without implementing proper user-specific namespaces or access control lists. This weakness can be categorized under CWE-284, which addresses improper access control, and aligns with ATT&CK technique T1078 for valid accounts and T1566 for credential access through web application vulnerabilities.
The operational impact of this vulnerability extends beyond simple data exposure, as it can enable attackers to access sensitive configuration information, user session data, or potentially administrative credentials stored within cached web pages. The appliance's local storage mechanism, intended to improve performance by reducing network requests, becomes a security risk when it fails to maintain proper user isolation. This vulnerability can be exploited by attackers who have gained any level of access to the appliance, whether through legitimate administrative access or through other compromised accounts. The risk is particularly concerning for organizations using the appliance for network security monitoring, as cached web content may contain sensitive threat intelligence, network topology information, or other data that could aid further attacks. The vulnerability affects the appliance's integrity and confidentiality guarantees, potentially enabling attackers to reconstruct user sessions or access information that should remain isolated to specific users or administrative contexts.
Organizations should immediately implement mitigations including updating to the latest available patch version from IBM that addresses the local storage access control issues. System administrators should also consider implementing additional monitoring of local storage directories and access patterns to detect unauthorized file access attempts. The appliance configuration should be reviewed to ensure that local caching mechanisms are properly isolated between user contexts, and access controls should be strengthened to prevent cross-user file access. Security teams should conduct comprehensive vulnerability assessments to identify any other potential storage or caching mechanisms that might exhibit similar access control flaws. The mitigation strategy should also include network segmentation and monitoring to detect anomalous access patterns that might indicate exploitation attempts. Organizations should also review their incident response procedures to ensure they can quickly identify and respond to potential exploitation of this vulnerability, as the impact extends to potential credential theft and session hijacking scenarios that could compromise broader network security.