CVE-2020-26262
Summary
| CVE | CVE-2020-26262 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2021-01-13 19:15:00 UTC |
| Updated | 2023-11-07 03:20:00 UTC |
| Description | 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. |
Risk And Classification
Problem Types: CWE-682 | CWE-441
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Coturn Project | Coturn | All | All | All | All |
| Application | Coturn Project | Coturn | All | All | All | All |
| Operating System | Fedoraproject | Fedora | 32 | All | All | All |
| Operating System | Fedoraproject | Fedora | 33 | All | All | All |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Merge branch 'advisory-fix-1' CVE-2020-26262 · coturn/coturn@abfe1fd · GitHub | MISC | github.com | Patch, Third Party Advisory |
| [SECURITY] Fedora 32 Update: coturn-4.5.2-1.fc32 - package-announce - Fedora Mailing-Lists | FEDORA | lists.fedoraproject.org | |
| [SECURITY] Fedora 33 Update: coturn-4.5.2-1.fc33 - package-announce - Fedora Mailing-Lists | lists.fedoraproject.org | ||
| [SECURITY] Fedora 33 Update: coturn-4.5.2-1.fc33 - package-announce - Fedora Mailing-Lists | FEDORA | lists.fedoraproject.org | |
| Loopback bypass by using 0.0.0.0, [::1] or [::] as the peer address · Advisory · coturn/coturn · GitHub | CONFIRM | github.com | Exploit, Third Party Advisory |
| [SECURITY] Fedora 32 Update: coturn-4.5.2-1.fc32 - package-announce - Fedora Mailing-Lists | lists.fedoraproject.org | ||
| coturn/ChangeLog at 57180ab60afcaeb13537e69ae8cb8aefd8f3f546 · coturn/coturn · GitHub | MISC | github.com | Release Notes, Third Party Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.