CVE-2023-22358 in BIG-IP Edge Client
Summary
by MITRE • 02/01/2023
In versions beginning with 7.2.2 to before 7.2.3.1, a DLL hijacking vulnerability exists in the BIG-IP Edge Client Windows Installer. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
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Analysis
by VulDB Data Team • 02/01/2023
The CVE-2023-22358 vulnerability represents a critical DLL hijacking flaw within the BIG-IP Edge Client Windows Installer component. This vulnerability specifically affects versions starting from 7.2.2 through the pre-7.2.3.1 release, creating a significant security risk for organizations relying on F5 Networks' edge client solutions. The issue stems from improper handling of dynamic link library loading sequences during the installation process, which allows malicious actors to manipulate the execution flow of legitimate system components.
The technical flaw manifests when the Windows Installer component fails to properly validate or restrict the search path for dynamic link libraries during the installation sequence. This creates an opportunity for attackers to place malicious DLL files in directories that are searched before the legitimate system directories, a technique commonly known as DLL hijacking. The vulnerability operates under CWE-426 which specifically addresses the execution of untrusted code due to insecure library loading practices. The installer process typically loads various DLL components from the installation directory or system paths without sufficient validation, allowing attackers to substitute legitimate libraries with malicious counterparts.
From an operational perspective, this vulnerability poses severe risks to enterprise security infrastructures that utilize BIG-IP Edge Client solutions. Attackers exploiting this weakness can potentially escalate privileges, execute arbitrary code, or gain unauthorized access to network resources. The impact extends beyond simple local privilege escalation as the compromised installer could be used to establish persistent access or deploy additional malicious payloads. Organizations using vulnerable versions face potential data breaches, unauthorized network access, and compromise of sensitive infrastructure components that rely on the edge client for secure connectivity.
Mitigation strategies should focus on immediate patching to versions 7.2.3.1 or later where the vulnerability has been addressed through proper DLL loading validation. System administrators should also implement additional security controls such as monitoring for unusual DLL loading patterns, restricting write permissions to installation directories, and employing application whitelisting solutions. The ATT&CK framework categorizes this vulnerability under T1574 which covers Hijack Execution Flow techniques, specifically targeting the legitimate system processes that are manipulated through DLL hijacking. Organizations should also consider network segmentation and enhanced endpoint detection capabilities to identify potential exploitation attempts, as the vulnerability could be leveraged as part of broader attack chains targeting enterprise networks.