CVE-2012-1493 in BIG-IP
Summary
by MITRE
F5 BIG-IP appliances 9.x before 9.4.8-HF5, 10.x before 10.2.4, 11.0.x before 11.0.0-HF2, and 11.1.x before 11.1.0-HF3, and Enterprise Manager before 2.1.0-HF2, 2.2.x before 2.2.0-HF1, and 2.3.x before 2.3.0-HF3, use a single SSH private key across different customers installations and do not properly restrict access to this key, which makes it easier for remote attackers to perform SSH logins via the PubkeyAuthentication option.
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Analysis
by VulDB Data Team • 01/02/2025
The vulnerability identified as CVE-2012-1493 affects F5 BIG-IP appliances across multiple version ranges, presenting a critical security weakness in the appliance's SSH implementation. This flaw resides in the configuration management system where a single SSH private key is deployed across different customer installations, creating a fundamental security risk that undermines the principle of least privilege and proper access control. The issue specifically impacts appliances running version 9.x before 9.4.8-HF5, 10.x before 10.2.4, 11.0.x before 11.0.0-HF2, 11.1.x before 11.1.0-HF3, and the Enterprise Manager components with corresponding version constraints. The vulnerability manifests through improper access restrictions on this shared private key, which violates security best practices and creates an attack surface that significantly increases the risk of unauthorized access.
The technical implementation flaw involves the hardcoded SSH private key mechanism where the same cryptographic key material is reused across multiple installations without proper isolation or access controls. This configuration directly enables the PubkeyAuthentication option to be exploited by remote attackers who can leverage the shared key to establish unauthorized SSH sessions. The vulnerability maps to CWE-310, which addresses cryptographic weaknesses and improper key management practices, specifically highlighting the improper use of cryptographic keys and the lack of proper key distribution mechanisms. The attack vector requires only remote access to the network and knowledge of the shared key's existence, making it particularly dangerous as it reduces the attack complexity and increases the likelihood of successful exploitation.
The operational impact of this vulnerability extends beyond simple unauthorized access, creating potential for persistent threats and lateral movement within network environments. Attackers who successfully exploit this vulnerability can gain root-level access to affected appliances, potentially compromising the entire network infrastructure managed by these BIG-IP systems. The shared key nature of the vulnerability means that a single successful exploitation can provide access to multiple customer installations, amplifying the damage potential and creating cascading security failures across different organizations. This weakness directly aligns with ATT&CK technique T1563.002, which covers "Remote Service Session Hijacking" and demonstrates how improper key management can lead to unauthorized access to critical infrastructure components.
Organizations should implement immediate mitigations including updating to patched versions of F5 BIG-IP appliances and Enterprise Manager components, which address the shared key vulnerability through proper key distribution mechanisms. Security teams must also review and implement proper access control policies for SSH services, ensuring that each installation uses unique cryptographic keys and that access restrictions are properly enforced. Network segmentation and monitoring should be enhanced to detect unauthorized SSH access attempts and potential exploitation of this vulnerability. The remediation process should include comprehensive key rotation procedures and implementation of proper cryptographic key management practices as outlined in NIST SP 800-57 and ISO/IEC 15408 standards, ensuring that future deployments avoid similar configuration weaknesses that could lead to unauthorized access to critical network infrastructure components.