CVE-2012-4948 in FortiOS
Summary
by MITRE
The default configuration of Fortinet Fortigate UTM appliances uses the same Certification Authority certificate and same private key across different customers installations, which makes it easier for man-in-the-middle attackers to spoof SSL servers by leveraging the presence of the Fortinet_CA_SSLProxy certificate in a list of trusted root certification authorities.
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Analysis
by VulDB Data Team • 11/03/2024
The vulnerability described in CVE-2012-4948 represents a critical cryptographic configuration flaw in Fortinet Fortigate Unified Threat Management appliances that undermines the fundamental security principles of SSL/TLS encryption. This weakness stems from the vendor's decision to deploy identical certificate authority credentials across multiple customer deployments, creating a scenario where attackers can exploit this shared trust relationship to impersonate legitimate SSL servers. The vulnerability specifically affects the SSL proxy functionality that Fortinet appliances use to inspect encrypted traffic, making it particularly dangerous in enterprise environments where network security is paramount.
The technical implementation of this flaw involves the deployment of a standardized Fortinet_CA_SSLProxy certificate with identical private keys across all affected installations. This configuration violates the core principle of cryptographic uniqueness that ensures trust relationships remain isolated between different entities. When a Fortigate appliance encounters SSL traffic, it must present a certificate to establish trust with the client, and in this case, the same certificate authority is used universally. This practice creates a single point of failure that attackers can exploit to generate valid certificates for arbitrary domains, effectively enabling man-in-the-middle attacks without requiring sophisticated cryptographic attacks or key recovery techniques.
The operational impact of this vulnerability extends far beyond simple network interception, as it fundamentally compromises the integrity of SSL/TLS communications that organizations rely upon for secure data transmission. Attackers can leverage this weakness to decrypt sensitive information, modify traffic in transit, or establish persistent backdoors through certificate spoofing. The vulnerability affects organizations using Fortigate appliances in various security contexts including web filtering, SSL inspection, and secure remote access implementations. The ease with which attackers can exploit this configuration means that even organizations with robust security policies may be vulnerable if they are using affected Fortigate models, as the attack vector does not require advanced technical skills or expensive resources to execute successfully.
This vulnerability aligns with CWE-310, which addresses cryptographic weaknesses in certificate management and key handling, and represents a clear violation of the principle of least privilege in security configuration. The attack pattern follows the MITRE ATT&CK framework's technique T1566, specifically targeting credential access through the exploitation of trusted relationships. Organizations using these appliances face significant risk of data breaches, regulatory compliance violations, and loss of customer trust when this vulnerability is exploited. The remediation process requires immediate certificate rotation and configuration updates to ensure that each deployment uses unique certificate authority credentials, though this process must be carefully managed to avoid disrupting existing network operations and SSL inspection capabilities.
The broader implications of this vulnerability highlight the critical importance of proper certificate management practices in enterprise security infrastructure. It demonstrates how vendor default configurations can introduce systemic security weaknesses that affect multiple organizations simultaneously, emphasizing the need for organizations to regularly audit their security configurations and implement proper certificate lifecycle management. This vulnerability also underscores the importance of maintaining updated security practices and the dangers of relying on shared or default security credentials in network infrastructure components that handle sensitive communications.