CVE-2017-17067 in Splunk
Summary
by MITRE
Splunk Web in Splunk Enterprise 7.0.x before 7.0.0.1, 6.6.x before 6.6.3.2, 6.5.x before 6.5.6, 6.4.x before 6.4.9, and 6.3.x before 6.3.12, when the SAML authType is enabled, mishandles SAML, which allows remote attackers to bypass intended access restrictions or conduct impersonation attacks.
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Analysis
by VulDB Data Team • 01/25/2021
The vulnerability identified as CVE-2017-17067 represents a critical authentication bypass flaw in Splunk Enterprise's SAML implementation that affects multiple version streams including 7.0.x, 6.6.x, 6.5.x, 6.4.x, and 6.3.x. This security weakness specifically manifests when the SAML authentication type is enabled within the Splunk Web interface, creating a pathway for remote attackers to circumvent intended access controls and potentially assume the identity of legitimate users. The flaw falls under the category of improper authentication handling as classified by CWE-287, which directly relates to the failure to properly validate authentication mechanisms. The vulnerability is particularly concerning because it enables attackers to conduct impersonation attacks, where malicious actors can exploit the flawed SAML handling to gain unauthorized access to sensitive data and systems within the Splunk environment.
The technical exploitation of this vulnerability occurs through the improper handling of SAML assertions and responses within Splunk's authentication framework. When SAML authentication is enabled, the system should rigorously validate the authentication tokens and assertions received from the identity provider before granting access. However, the flaw allows attackers to manipulate or bypass these validation checks, potentially enabling them to authenticate as any user, including administrators, without proper credentials. This misconfiguration essentially undermines the entire SAML-based authentication mechanism, rendering the security controls ineffective. The vulnerability is particularly dangerous because it affects the core authentication infrastructure of Splunk Enterprise, which typically handles sensitive operational data, security logs, and monitoring information that organizations rely upon for cybersecurity operations. The attack vector is remote, meaning that adversaries can exploit this weakness from outside the network perimeter, making it accessible to a broad range of threat actors.
The operational impact of CVE-2017-17067 extends beyond simple unauthorized access, as it creates opportunities for persistent threats to establish footholds within Splunk environments and potentially expand their access to connected systems. Organizations using affected Splunk versions with SAML authentication enabled face significant risks including data exfiltration, privilege escalation, and potential lateral movement within their network infrastructure. The vulnerability aligns with several tactics in the MITRE ATT&CK framework, particularly those related to credential access and privilege escalation, where attackers can leverage compromised SAML authentication to gain elevated permissions. The flaw also represents a weakness in the principle of least privilege, as it allows attackers to bypass the intended access controls that should restrict user activities based on their roles and permissions. Security professionals should note that this vulnerability affects the core Splunk Web interface, which is often used by security analysts, system administrators, and other personnel who require access to critical monitoring and analysis capabilities.
Organizations should implement immediate mitigations including upgrading to the patched versions of Splunk Enterprise that address this vulnerability, specifically versions 7.0.0.1, 6.6.3.2, 6.5.6, 6.4.9, and 6.3.12. Additionally, administrators should consider disabling SAML authentication until the upgrade process is complete, particularly in environments where the risk assessment indicates high exposure to external threats. Network segmentation and monitoring of authentication attempts can help detect exploitation attempts, while implementing multi-factor authentication can provide additional protection layers. The vulnerability demonstrates the critical importance of maintaining current security patches and the potential consequences of delayed updates in enterprise security platforms. Organizations should also conduct thorough assessments of their SAML configurations and authentication flows to identify any other potential weaknesses that could be exploited in conjunction with this vulnerability, ensuring comprehensive protection of their security infrastructure and sensitive operational data.