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Debian Security Advisory DSA-4829-1                   [email protected]
https://www.debian.org/security/                     Salvatore Bonaccorso
January 11, 2021                      https://www.debian.org/security/faq
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Package        : coturn
CVE ID         : CVE-2020-26262

A flaw was discovered in coturn, a TURN and STUN server for VoIP. By
default coturn does not allow peers on the loopback addresses
(127.x.x.x and ::1). A remote attacker can bypass the protection via a
specially crafted request using a peer address of '' and trick
coturn in relaying to the loopback interface. If listening on IPv6 the
loopback interface can also be reached by using either [::1] or [::] as
the address.

For the stable distribution (buster), this problem has been fixed in

We recommend that you upgrade your coturn packages.

For the detailed security status of coturn please refer to its security
tracker page at:

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: [email protected]