CVE-2023-39447 in BIG-IP
Summary
by MITRE • 10/25/2023
When BIG-IP APM Guided Configurations are configured, undisclosed sensitive information may be logged in restnoded log. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
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Analysis
by VulDB Data Team • 10/28/2023
The vulnerability identified as CVE-2023-39447 affects F5 BIG-IP Access Policy Manager (APM) systems where guided configurations are implemented. This issue represents a sensitive data exposure risk that occurs during the operation of the restnoded service, which is responsible for managing the REST API endpoints of the BIG-IP system. The flaw manifests when the system logs information that should remain confidential, potentially compromising the security posture of organizations relying on these access management solutions.
The technical nature of this vulnerability involves improper logging mechanisms within the BIG-IP APM component that fails to adequately sanitize or filter sensitive information before writing it to log files. When guided configurations are executed, certain parameters or data elements that should remain confidential are inadvertently captured and stored in the restnoded log files. This represents a violation of information security principles and can expose credentials, session tokens, or other privileged data to unauthorized parties who gain access to these log files. The vulnerability falls under the category of information exposure, specifically related to sensitive data being logged inappropriately, which aligns with CWE-209 and CWE-312 classifications.
The operational impact of this vulnerability extends beyond simple data exposure, as it can facilitate further attacks within the network infrastructure. Attackers who gain access to the restnoded log files could extract sensitive authentication tokens, user credentials, or other confidential information that would enable them to impersonate legitimate users or escalate privileges within the BIG-IP environment. This vulnerability particularly affects organizations that rely heavily on BIG-IP APM for access control and authentication management, as it undermines the security controls designed to protect sensitive access information. The risk is compounded by the fact that log files are often stored in accessible locations and may not be properly secured or rotated, creating persistent exposure windows.
Organizations should implement immediate mitigations including restricting access to restnoded log files through proper file permissions and access controls, implementing log file rotation with secure deletion policies, and configuring the system to avoid logging sensitive information where possible. The vulnerability also highlights the importance of following the principle of least privilege in logging configurations and ensuring that system administrators properly audit log contents for sensitive data. Security teams should monitor log files for unauthorized access attempts and implement additional logging controls that prevent sensitive information from being written to persistent storage. This vulnerability aligns with ATT&CK technique T1562.006 for credential dumping and T1078 for valid accounts, as it potentially exposes authentication data that could be leveraged for unauthorized system access. Organizations should also consider implementing automated log analysis tools that can detect and alert on the presence of sensitive information in log files, providing additional layers of protection against this type of information exposure attack vector.