CVE-2020-26262— CoTURN 授权问题漏洞
一分钟漏洞结论
影响对象
coturn coturn
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
CoTURN是一款TURN（VoIP媒体业务NAT穿越服务器和网关）和STUN（用户数据报协议简单穿越网络地址转换器）Server的开源实现。 Coturn 存在授权问题漏洞，攻击者可利用该漏洞绕过对数据的访问限制，以获取敏感信息。
可能的 ATT&CK 技术 1 AI
T1557.001 · Name Resolution Poisoning and SMB Relay
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一、 漏洞 CVE-2020-26262 基础信息
漏洞信息
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Vulnerability Title
Loopback bypass in Coturn
来源: CVE Program / CVE List V5
Vulnerability 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.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
未有动机的代理或中间人(混淆代理)
来源: CVE Program / CVE List V5
Vulnerability Title
CoTURN 授权问题漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
CoTURN是一款TURN（VoIP媒体业务NAT穿越服务器和网关）和STUN（用户数据报协议简单穿越网络地址转换器）Server的开源实现。 Coturn 存在授权问题漏洞，攻击者可利用该漏洞绕过对数据的访问限制，以获取敏感信息。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2020-26262 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2020-26262 补丁与修复 (1)
CVE-2020-26262 厂商安全公告 (1)
CVE-2020-26262 邮件列表归档 (2)
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M4CJOPAQT43MYAFU3UROGLEXN3Z6RS4H/ vendor-advisory x_refsource_FEDORA
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G54UIUFTEC6RLPOISMB6FUW7456SBZC4/ vendor-advisory x_refsource_FEDORA
CVE-2020-26262 其他参考 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2020-26262
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