CVE-2020-26262 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2020-26262 Interim 1 6 2022-10-15T15:14:43Z current 2021-05-30T14:44:27Z 2022-10-15T15:14:43Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2020-26262 Coturn is free open source implementation of TURN and STUN Server. Coturn before version 4.5.2 by default does not allow peers to connect and relay packets to loopback addresses in the range of `127.x.x.x`. However, it was observed that when sending a `CONNECT` request with the `XOR-PEER-ADDRESS` value of `0.0.0.0`, a successful response was received and subsequently, `CONNECTIONBIND` also received a successful response. Coturn then is able to relay packets to the loopback interface. Additionally, when coturn is listening on IPv6, which is default, the loopback interface can also be reached by making use of either `[::1]` or `[::]` as the peer address. By using the address `0.0.0.0` as the peer address, a malicious user will be able to relay packets to the loopback interface, unless `--denied-peer-ip=0.0.0.0` (or similar) has been specified. Since the default configuration implies that loopback peers are not allowed, coturn administrators may choose to not set the `denied-peer-ip` setting. The issue patched in version 4.5.2. As a workaround the addresses in the address block `0.0.0.0/8`, `[::1]` and `[::]` should be denied by default unless `--allow-loopback-peers` has been specified. The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). https://www.suse.com/support/security/rating/ SUSE Security Ratings openSUSE Tumbleweed coturn-4.5.2-2.2 coturn-devel-4.5.2-2.2 coturn-utils-4.5.2-2.2 coturn-4.5.2-2.2 as a component of openSUSE Tumbleweed coturn-devel-4.5.2-2.2 as a component of openSUSE Tumbleweed coturn-utils-4.5.2-2.2 as a component of openSUSE Tumbleweed Coturn is free open source implementation of TURN and STUN Server. Coturn before version 4.5.2 by default does not allow peers to connect and relay packets to loopback addresses in the range of `127.x.x.x`. However, it was observed that when sending a `CONNECT` request with the `XOR-PEER-ADDRESS` value of `0.0.0.0`, a successful response was received and subsequently, `CONNECTIONBIND` also received a successful response. Coturn then is able to relay packets to the loopback interface. Additionally, when coturn is listening on IPv6, which is default, the loopback interface can also be reached by making use of either `[::1]` or `[::]` as the peer address. By using the address `0.0.0.0` as the peer address, a malicious user will be able to relay packets to the loopback interface, unless `--denied-peer-ip=0.0.0.0` (or similar) has been specified. Since the default configuration implies that loopback peers are not allowed, coturn administrators may choose to not set the `denied-peer-ip` setting. The issue patched in version 4.5.2. As a workaround the addresses in the address block `0.0.0.0/8`, `[::1]` and `[::]` should be denied by default unless `--allow-loopback-peers` has been specified. CVE-2020-26262 openSUSE Tumbleweed:coturn-4.5.2-2.2 openSUSE Tumbleweed:coturn-devel-4.5.2-2.2 openSUSE Tumbleweed:coturn-utils-4.5.2-2.2 moderate 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N 7.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N