CyberRota Analysis
AI-GeneratedCoturn versions prior to 4.13.0 are vulnerable due to a flaw in the handling of loopback peers, allowing authenticated TURN clients to bypass default protections and expose localhost-bound services through TURN relay traffic. This could lead to unauthorized access to sensitive services on the host, posing a significant security risk. Organizations using Coturn for TURN or STUN services should prioritize upgrading to version 4.13.0 or later to mitigate this vulnerability.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, coturn rejects loopback peers by default unless allow-loopback-peers is enabled, but the default loopback guard can be bypassed by using the IPv4-mapped IPv6 peer address ::ffff:127.0.0.1 in a TURN XOR-PEER-ADDRESS attribute. ioa_addr_is_loopback checks for the literal IPv6 loopback shape before IPv4-mapped IPv6 handling, so good_peer_addr does not apply the default loopback rejection and an authenticated TURN client can expose services bound only to localhost on the coturn host through TURN relay traffic. This issue is fixed in version 4.13.0.
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