CVE-2012-4671 in psyced
Summary
by MITRE
psyced before 20120821 does not verify that a request was made for an XMPP Server Dialback response, which allows remote XMPP servers to spoof domains via responses for domains that were not asserted.
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Analysis
by VulDB Data Team • 02/19/2019
The vulnerability identified as CVE-2012-4671 affects psyced versions prior to 20120821 and represents a critical flaw in XMPP server dialback authentication mechanisms. This issue resides in the protocol validation layer where the system fails to properly verify the authenticity of XMPP server dialback responses, creating a significant security gap that can be exploited by malicious remote entities. The flaw specifically impacts the verification process that should ensure dialback responses correspond to domains that were legitimately requested for verification.
The technical implementation of this vulnerability stems from insufficient input validation within the XMPP server dialback protocol handling. When remote XMPP servers attempt to authenticate their identity through dialback responses, the psyced system does not adequately validate whether these responses were actually requested for the domains they claim to represent. This validation gap allows attackers to craft malicious responses that appear legitimate to the system, effectively bypassing the intended security controls. The flaw operates at the protocol level where authentication tokens and verification responses are processed without proper domain assertion checking.
The operational impact of this vulnerability is substantial as it enables remote attackers to spoof domain identities within XMPP networks, potentially leading to man-in-the-middle attacks, unauthorized access to communication channels, and disruption of legitimate services. An attacker can exploit this weakness to impersonate legitimate domains and gain unauthorized access to resources that should only be accessible to verified XMPP servers. This capability undermines the fundamental trust model of XMPP communication systems and can result in data breaches or service disruption across affected networks.
The vulnerability maps to CWE-284 Access Control Bypass and aligns with ATT&CK technique T1078 Valid Accounts, as it allows unauthorized entities to assume legitimate identities within XMPP networks. Organizations using affected psyced versions face potential compromise of their XMPP infrastructure, with attackers able to establish unauthorized communication channels and potentially intercept or manipulate sensitive XMPP traffic. The impact extends beyond immediate security concerns to include potential compliance violations and damage to network integrity.
Mitigation strategies should include immediate upgrade to psyced version 20120821 or later, which contains the necessary fixes for proper domain verification during XMPP server dialback operations. Network administrators should also implement additional monitoring for suspicious authentication patterns and consider deploying intrusion detection systems that can identify anomalous dialback response behaviors. The fix addresses the core validation issue by ensuring that all dialback responses are properly validated against the original domain assertions, preventing the spoofing attack vector entirely.