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CVE-2021-21382— Restund 安全漏洞

一分钟漏洞结论

影响对象
wireapp restund
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。

Restund是开源的网络穿透服务器。 Restund 存在安全漏洞，该漏洞源于Restund是一个开源的NAT穿越服务器，可以指示返回TURN服务器打开到环回地址范围的中继，这允许您访问在本地主机上运行的任何其他您认为是私有的服务。

CVSS 8.6 · High EPSS 1.47% · P73
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一、 漏洞 CVE-2021-21382 基础信息

漏洞信息
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Vulnerability Title
Unsafe loopback forwarding interface in Restund
来源: CVE Program / CVE List V5
Vulnerability Description
Restund is an open source NAT traversal server. The restund TURN server can be instructed to open a relay to the loopback address range. This allows you to reach any other service running on localhost which you might consider private. In the configuration that we ship (https://github.com/wireapp/ansible-restund/blob/master/templates/restund.conf.j2#L40-L43) the `status` interface of restund is enabled and is listening on `127.0.0.1`.The `status` interface allows users to issue administrative commands to `restund` like listing open relays or draining connections. It would be possible for an attacker to contact the status interface and issue administrative commands by setting `XOR-PEER-ADDRESS` to `127.0.0.1:{{restund_udp_status_port}}` when opening a TURN channel. We now explicitly disallow relaying to loopback addresses, 'any' addresses, link local addresses, and the broadcast address. As a workaround disable the `status` module in your restund configuration. However there might still be other services running on `127.0.0.0/8` that you do not want to have exposed. The `turn` module can be disabled. Restund will still perform STUN and this might already be enough for initiating calls in your environments. TURN is only used as a last resort when other NAT traversal options do not work. One should also make sure that the TURN server is set up with firewall rules so that it cannot relay to other addresses that you don't want the TURN server to relay to. For example other services in the same VPC where the TURN server is running. Ideally TURN servers should be deployed in an isolated fashion where they can only reach what they need to reach to perform their task of assisting NAT-traversal.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
将资源暴露给错误范围
来源: CVE Program / CVE List V5
Vulnerability Title
Restund 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Restund是开源的网络穿透服务器。 Restund 存在安全漏洞，该漏洞源于Restund是一个开源的NAT穿越服务器，可以指示返回TURN服务器打开到环回地址范围的中继，这允许您访问在本地主机上运行的任何其他您认为是私有的服务。
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

厂商 产品 影响版本 CPE 订阅
wireapp restund < 0.4.15 -

二、漏洞 CVE-2021-21382 的公开POC

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三、漏洞 CVE-2021-21382 的情报信息

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CVE-2021-21382 补丁与修复 (1)

CVE-2021-21382 厂商安全公告 (2)

CVE-2021-21382 其他参考 (3)

IV. Related Vulnerabilities

Same vendor: wireapp
Same weakness: CWE-668

V. Comments for CVE-2021-21382

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