CVE-2016-7145 in nefarious2
Summary
by MITRE
The m_authenticate function in ircd/m_authenticate.c in nefarious2 allows remote attackers to spoof certificate fingerprints and consequently log in as another user via a crafted AUTHENTICATE parameter.
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Analysis
by VulDB Data Team • 09/04/2020
The vulnerability identified as CVE-2016-7145 resides within the nefarious2 IRC daemon implementation where the m_authenticate function in ircd/m_authenticate.c fails to properly validate certificate fingerprints during authentication processes. This flaw enables remote attackers to manipulate the authentication flow by crafting malicious AUTHENTICATE parameters that present forged certificate fingerprints, thereby allowing unauthorized access and impersonation of legitimate users within the IRC network.
This security weakness represents a critical authentication bypass vulnerability that directly impacts the integrity and confidentiality of communications within IRC environments. The flaw stems from insufficient validation of cryptographic certificates during the authentication handshake process, creating a pathway for attackers to exploit the trust relationship between the IRC server and authenticated clients. The vulnerability specifically affects the certificate fingerprint verification mechanism, allowing adversaries to submit crafted certificate data that appears legitimate to the server's validation routines.
The operational impact of CVE-2016-7145 extends beyond simple unauthorized access, as it enables persistent impersonation attacks that can compromise the entire IRC network's security posture. Attackers can leverage this vulnerability to assume the identity of legitimate users, potentially gaining access to private channels, executing commands as authorized users, and conducting man-in-the-middle attacks against other network participants. The remote nature of the exploit means that attackers do not require physical access to the network or direct system compromise to exploit this weakness.
From a cybersecurity perspective, this vulnerability aligns with CWE-287 which addresses improper authentication mechanisms, and maps to ATT&CK technique T1550.001 for use of valid credentials, as it allows attackers to leverage legitimate authentication tokens through certificate spoofing. The flaw demonstrates a fundamental failure in certificate validation protocols and highlights the importance of proper cryptographic verification in authentication systems. Organizations using nefarious2 or similar IRC implementations must urgently address this vulnerability through immediate patching or implementation of alternative authentication mechanisms that properly validate certificate integrity.
Mitigation strategies should include immediate deployment of vendor patches, implementation of additional authentication layers such as SASL with strong authentication protocols, and enhanced monitoring of authentication events for suspicious certificate fingerprint patterns. Network administrators should also consider implementing certificate pinning mechanisms and regular security audits of authentication processes to prevent similar vulnerabilities from being exploited in the future. The vulnerability underscores the critical importance of robust certificate validation in cryptographic authentication systems and the potential consequences when such validation is bypassed through crafted parameter manipulation.