CVE-2016-6089 in WebSphere MQ
Summary
by MITRE
IBM WebSphere MQ 9.0.0.1 and 9.0.2 could allow a local user to write to a file or delete files in a directory they should not have access to due to improper access controls. IBM X-Force ID: 117926.
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Analysis
by VulDB Data Team • 12/26/2020
IBM WebSphere MQ version 9.0.0.1 and 9.0.2 contains a critical local privilege escalation vulnerability that stems from inadequate access control mechanisms within the messaging queue system. This flaw allows authenticated local users to bypass file system permissions and perform unauthorized file operations including writing to restricted files or deleting directory contents that should be protected from their access level. The vulnerability exists within the application's file handling routines where proper permission checks are either missing or incorrectly implemented, creating a path for privilege escalation attacks. The issue manifests when local users exploit the improper access controls to manipulate files within the WebSphere MQ installation directories, potentially leading to system compromise and unauthorized data access.
The technical implementation of this vulnerability involves the application's failure to properly validate file system access permissions during critical operations. When WebSphere MQ processes file operations, it does not adequately verify whether the requesting user has appropriate authorization levels to perform the requested file manipulation actions. This weakness aligns with CWE-284 which specifically addresses improper access control mechanisms, and represents a direct violation of the principle of least privilege that should govern all system operations. The vulnerability is classified as a local privilege escalation issue because it requires local system access but does not necessitate elevated privileges initially, making it particularly dangerous for systems where local users might have limited access but could exploit this flaw to gain broader system control.
Operational impact of this vulnerability extends beyond simple file manipulation capabilities as it provides potential attackers with pathways to compromise the entire WebSphere MQ environment. Local users who can exploit this vulnerability may gain access to sensitive configuration files, log data, or even system binaries that could be modified to establish persistent access or escalate privileges further. The implications are particularly severe in enterprise environments where WebSphere MQ serves as a critical messaging infrastructure component, as unauthorized file modifications could disrupt business operations or provide attackers with opportunities to exfiltrate sensitive data. This vulnerability also creates opportunities for attackers to establish backdoors or install malicious code that could persist beyond the initial exploitation phase, making it a significant concern for security-conscious organizations.
Mitigation strategies for this vulnerability should include immediate application of the vendor-provided security patches that address the improper access control implementation. Organizations should implement comprehensive access control reviews to ensure that file system permissions are properly configured and that the principle of least privilege is maintained across all WebSphere MQ components. Network segmentation and privilege separation measures should be reinforced to limit local user access to only necessary system resources. Security monitoring should be enhanced to detect unauthorized file access patterns or modifications that might indicate exploitation attempts. Additionally, implementing the ATT&CK framework's privilege escalation techniques can help organizations identify and remediate similar access control weaknesses throughout their infrastructure. Regular security assessments and vulnerability scanning should be conducted to ensure that no other components within the WebSphere MQ environment contain similar improper access control implementations that could be exploited by malicious actors.