CVE-2020-26262
Vulnerability from cvelistv5
Published
2021-01-13 18:15
Modified
2024-08-04 15:56
Severity ?
7.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
EPSS score ?
0.34% (0.53492)
Summary
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.
References
security-advisories@github.comhttps://github.com/coturn/coturn/blob/57180ab60afcaeb13537e69ae8cb8aefd8f3f546/ChangeLog#L48Release Notes, Third Party Advisory
security-advisories@github.comhttps://github.com/coturn/coturn/commit/abfe1fd08d78baa0947d17dac0f7411c3d948e4dPatch, Third Party Advisory
security-advisories@github.comhttps://github.com/coturn/coturn/security/advisories/GHSA-6g6j-r9rf-cm7pExploit, Third Party Advisory
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G54UIUFTEC6RLPOISMB6FUW7456SBZC4/
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M4CJOPAQT43MYAFU3UROGLEXN3Z6RS4H/
af854a3a-2127-422b-91ae-364da2661108https://github.com/coturn/coturn/blob/57180ab60afcaeb13537e69ae8cb8aefd8f3f546/ChangeLog#L48Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/coturn/coturn/commit/abfe1fd08d78baa0947d17dac0f7411c3d948e4dPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/coturn/coturn/security/advisories/GHSA-6g6j-r9rf-cm7pExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G54UIUFTEC6RLPOISMB6FUW7456SBZC4/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M4CJOPAQT43MYAFU3UROGLEXN3Z6RS4H/
Impacted products
Vendor Product Version
coturn coturn Version: < 4.5.2
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}


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