| 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. |
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| Publication Date | Jan. 14, 2021, 4:15 a.m. |
| Registration Date | Jan. 26, 2021, 10:40 a.m. |
| Last Update | Nov. 21, 2024, 2:19 p.m. |
| CVSS3.1 : HIGH | |
| スコア | 7.2 |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| 攻撃元区分(AV) | ネットワーク |
| 攻撃条件の複雑さ(AC) | 低 |
| 攻撃に必要な特権レベル(PR) | 不要 |
| 利用者の関与(UI) | 不要 |
| 影響の想定範囲(S) | 変更あり |
| 機密性への影響(C) | 低 |
| 完全性への影響(I) | 低 |
| 可用性への影響(A) | なし |
| CVSS2.0 : MEDIUM | |
| Score | 6.4 |
|---|---|
| Vector | AV:N/AC:L/Au:N/C:P/I:P/A:N |
| 攻撃元区分(AV) | ネットワーク |
| 攻撃条件の複雑さ(AC) | 低 |
| 攻撃前の認証要否(Au) | 不要 |
| 機密性への影響(C) | 低 |
| 完全性への影響(I) | 低 |
| 可用性への影響(A) | なし |
| Get all privileges. | いいえ |
| Get user privileges | いいえ |
| Get other privileges | いいえ |
| User operation required | いいえ |
| Configuration1 | or higher | or less | more than | less than | |
| cpe:2.3:a:coturn_project:coturn:*:*:*:*:*:*:*:* | 4.5.2 | ||||
| Configuration2 | or higher | or less | more than | less than | |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | |||||
| cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | |||||
| Title | Coturn における計算の誤りに関する脆弱性 |
|---|---|
| Summary | Coturn には、計算の誤りに関する脆弱性、およびフィルタリングの回避に関する脆弱性が存在します。 |
| Possible impacts | 情報を取得される、および情報を改ざんされる可能性があります。 |
| Solution | ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。 |
| Publication Date | Oct. 1, 2020, midnight |
| Registration Date | Sept. 22, 2021, 6:11 p.m. |
| Last Update | Sept. 22, 2021, 6:11 p.m. |
| coturn project |
| coturn 4.5.2 未満 |
| No | Changed Details | Date of change |
|---|---|---|
| 1 | [2021年09月22日] 掲載 |
Sept. 22, 2021, 6:11 p.m. |