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CVE-2021-43784— runc 输入验证错误漏洞

一分钟漏洞结论

影响对象
opencontainers runc
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。

runc是一款用于根据OCI规范生成和运行容器的CLI（命令行界面）工具。 runc 存在输入验证错误漏洞，该漏洞源于integer overflow in netlink bytemsg length字段允许攻击者可利用该漏洞覆盖基于netlink的容器配置。

CVSS 6.0 · Medium EPSS 1.80% · P78
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一、 漏洞 CVE-2021-43784 基础信息

漏洞信息
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Vulnerability Title
Overflow in netlink bytemsg length field allows attacker to override netlink-based container configuration
来源: CVE Program / CVE List V5
Vulnerability Description
runc is a CLI tool for spawning and running containers on Linux according to the OCI specification. In runc, netlink is used internally as a serialization system for specifying the relevant container configuration to the `C` portion of the code (responsible for the based namespace setup of containers). In all versions of runc prior to 1.0.3, the encoder did not handle the possibility of an integer overflow in the 16-bit length field for the byte array attribute type, meaning that a large enough malicious byte array attribute could result in the length overflowing and the attribute contents being parsed as netlink messages for container configuration. This vulnerability requires the attacker to have some control over the configuration of the container and would allow the attacker to bypass the namespace restrictions of the container by simply adding their own netlink payload which disables all namespaces. The main users impacted are those who allow untrusted images with untrusted configurations to run on their machines (such as with shared cloud infrastructure). runc version 1.0.3 contains a fix for this bug. As a workaround, one may try disallowing untrusted namespace paths from your container. It should be noted that untrusted namespace paths would allow the attacker to disable namespace protections entirely even in the absence of this bug.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
来源: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
来源: CVE Program / CVE List V5
Vulnerability Title
runc 输入验证错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
runc是一款用于根据OCI规范生成和运行容器的CLI（命令行界面）工具。 runc 存在输入验证错误漏洞，该漏洞源于integer overflow in netlink bytemsg length字段允许攻击者可利用该漏洞覆盖基于netlink的容器配置。
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
opencontainers runc < 1.0.3 -

二、漏洞 CVE-2021-43784 的公开POC

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三、漏洞 CVE-2021-43784 的情报信息

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CVE-2021-43784 补丁与修复 (3)

CVE-2021-43784 厂商安全公告 (1)

CVE-2021-43784 邮件列表归档 (2)

CVE-2021-43784 其他参考 (1)

IV. Related Vulnerabilities

Same product: runc
Same vendor: opencontainers
Same weakness: CWE-190

V. Comments for CVE-2021-43784

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