CVE-2018-5524 in BIG-IP
Summary
by MITRE
Under certain conditions, on F5 BIG-IP 13.0.0-13.1.0.5, 12.1.0-12.1.3.1, or 11.6.1 HF2-11.6.3.1, virtual servers configured with Client SSL or Server SSL profiles which make use of network hardware security module (HSM) functionality are exposed and impacted by this issue.
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Analysis
by VulDB Data Team • 03/19/2023
The vulnerability identified as CVE-2018-5524 affects F5 BIG-IP systems running specific versions of the BIG-IP operating system including 13.0.0 through 13.1.0.5, 12.1.0 through 12.1.3.1, and 11.6.1 HF2 through 11.6.3.1. This issue specifically targets virtual servers that utilize Client SSL or Server SSL profiles in conjunction with hardware security module functionality. The flaw represents a significant security weakness that undermines the cryptographic protections typically provided by hardware security modules, which are designed to securely store and manage cryptographic keys while maintaining their confidentiality and integrity. The vulnerability stems from improper handling of HSM connections within the SSL profile configuration, creating potential exposure points that could allow unauthorized access to sensitive cryptographic operations.
The technical implementation of this vulnerability involves a failure in the proper isolation and management of hardware security module resources when SSL profiles are configured for virtual servers. When systems utilize HSM functionality for SSL termination or acceleration, the normal cryptographic key management processes should ensure that private keys remain protected within the secure hardware environment. However, the flaw allows for potential information disclosure or manipulation of the HSM connections, effectively compromising the security assurances that organizations rely upon when implementing hardware security modules. This issue operates at the intersection of cryptographic security and network infrastructure management, where the improper handling of hardware security module contexts creates opportunities for adversaries to gain unauthorized access to cryptographic operations that should remain isolated and protected.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable more sophisticated attacks against the affected systems. Organizations utilizing F5 BIG-IP appliances with SSL profiles and HSM functionality may find their cryptographic protections weakened, potentially allowing attackers to intercept encrypted communications, perform man-in-the-middle attacks, or compromise the integrity of SSL/TLS connections. The vulnerability particularly affects environments where sensitive data is transmitted through SSL-terminated virtual servers, making it especially concerning for financial services, healthcare organizations, and any enterprise handling regulated data. Attackers could exploit this weakness to access encrypted communications, potentially leading to data breaches or compliance violations that would have significant financial and reputational consequences.
Organizations should implement immediate mitigations including applying the latest security patches provided by F5, which address the specific HSM handling issues within the SSL profile implementations. Network segmentation and monitoring should be enhanced to detect anomalous HSM connection patterns or unauthorized access attempts. The vulnerability aligns with CWE-310, which addresses cryptographic weaknesses in security systems, and represents a specific instance of improper handling of cryptographic operations that violates fundamental security principles. From an ATT&CK perspective, this vulnerability could enable techniques such as credential access through manipulation of cryptographic key management systems, potentially leading to broader system compromise. Additionally, organizations should conduct comprehensive assessments of their SSL profile configurations to identify all affected virtual servers and ensure that proper access controls and monitoring are in place to detect potential exploitation attempts.