CVE-2022-24968 in xmpp
Summary
by MITRE • 02/12/2022
In Mellium mellium.im/xmpp through 0.21.0, an attacker capable of spoofing DNS TXT records can redirect a WebSocket connection request to a server under their control without causing TLS certificate verification to fail. This occurs because the wrong host name is selected during this verification.
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Analysis
by VulDB Data Team • 02/17/2022
The vulnerability identified as CVE-2022-24968 affects the Mellium mellium.im/xmpp library version 0.21.0 and earlier, presenting a significant security flaw in the WebSocket connection establishment process. This issue stems from improper hostname validation during TLS certificate verification, creating a potential man-in-the-middle attack vector that could allow adversaries to redirect traffic to malicious servers while maintaining the appearance of legitimate connections. The flaw specifically impacts applications that utilize this library for XMPP communications over WebSocket protocols, potentially compromising the integrity of secure messaging channels.
The technical root cause of this vulnerability lies in the library's implementation of DNS TXT record validation during the WebSocket connection process. When establishing secure connections, the system should verify that the TLS certificate presented by the server matches the expected hostname for the target service. However, the Mellium library incorrectly selects the hostname during this verification process, allowing attackers who can spoof DNS TXT records to manipulate the connection routing. This misconfiguration enables attackers to redirect WebSocket requests to servers they control without triggering certificate verification failures, effectively bypassing the security mechanisms designed to prevent such attacks.
The operational impact of CVE-2022-24968 extends beyond simple connection redirection, potentially enabling sophisticated attack scenarios including data interception, session hijacking, and unauthorized access to sensitive communications. Applications using the affected library may experience compromised security postures where legitimate users believe they are connecting to trusted XMPP servers while actually communicating with attacker-controlled infrastructure. This vulnerability particularly affects systems relying on XMPP for instant messaging, presence information, and other real-time communication services where maintaining connection integrity is critical for security.
Security professionals should consider this vulnerability in the context of CWE-295 which addresses improper certificate validation and ATT&CK technique T1566 which covers credential harvesting through social engineering and spoofing attacks. The flaw demonstrates how DNS-based spoofing can be leveraged to undermine TLS security mechanisms, making it particularly dangerous for applications that depend on secure WebSocket connections for critical communications. Organizations using Mellium mellium.im/xmpp libraries should prioritize immediate patching to version 0.22.0 or later, where the hostname selection logic has been corrected to properly validate certificates against the intended server names. Additionally, network monitoring should be enhanced to detect unusual DNS resolution patterns and connection attempts that might indicate exploitation attempts, while implementing additional verification mechanisms beyond standard TLS certificate checks to provide defense-in-depth protection against similar vulnerabilities.