CVE-2012-6606 in NetConnect
Summary
by MITRE
Palo Alto Networks GlobalProtect before 1.1.7, and NetConnect, does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof portal servers and obtain sensitive information via a crafted certificate.
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Analysis
by VulDB Data Team • 10/07/2018
The vulnerability identified as CVE-2012-6606 affects Palo Alto Networks GlobalProtect client software versions prior to 1.1.7 and the NetConnect component, representing a critical security flaw in the certificate validation process. This issue stems from the software's failure to properly validate X.509 certificates during SSL/TLS connections, creating a significant attack surface that adversaries can exploit to conduct man-in-the-middle attacks against legitimate users. The vulnerability specifically targets the certificate verification mechanism that should ensure the authenticity of SSL servers before establishing secure connections, effectively undermining the fundamental security guarantees provided by SSL/TLS protocols.
The technical flaw manifests in the software's inability to perform proper certificate chain validation and hostname verification during SSL handshakes. When GlobalProtect or NetConnect attempts to establish a secure connection to a portal server, the client should validate that the presented certificate is issued by a trusted certificate authority and that the certificate's subject matches the expected hostname. However, due to the vulnerability, these critical validation steps are bypassed, allowing attackers to present fraudulent certificates that appear legitimate to the client software. This weakness directly aligns with CWE-295, which describes improper certificate validation, and represents a classic example of trust management failure in cryptographic protocols.
The operational impact of this vulnerability is severe and multifaceted, as it enables attackers to intercept and potentially manipulate sensitive communications between users and legitimate portal servers. An attacker positioned within the network or capable of performing DNS spoofing or ARP poisoning attacks can present a malicious certificate that the vulnerable client will accept without proper verification. This allows them to decrypt and monitor all traffic passing through the GlobalProtect client, potentially gaining access to confidential information including user credentials, private communications, and sensitive business data. The vulnerability can be exploited across various network environments where Palo Alto Networks products are deployed, making it particularly dangerous for organizations relying on these security solutions for remote access protection.
Organizations affected by this vulnerability should immediately implement comprehensive mitigation strategies to protect their networks and users. The primary and most effective mitigation is to upgrade to GlobalProtect client version 1.1.7 or later, which includes proper certificate validation mechanisms. Additionally, network administrators should consider implementing additional security controls such as certificate pinning for critical portal servers, enhanced network monitoring to detect unusual traffic patterns, and regular security assessments to identify potential exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to techniques involving credential access through man-in-the-middle attacks and secure credential transmission, making it a critical target for defensive measures. Organizations should also review their certificate management practices and implement proper certificate lifecycle management to ensure that only trusted certificates are accepted by their systems, thereby reducing the attack surface and strengthening overall security posture against similar vulnerabilities.