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CVE-2021-39134— NPM arborist 后置链接漏洞

一分钟漏洞结论

影响对象
npm arborist
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。

NPM arborist是美国npm（NPM）公司的一个软件包。用于可视化存储为平面列表的分层数据。 arborist 存在后置链接漏洞，该漏洞允许攻击者进行任意文件创建、任意文件覆盖和任意代码执行。

CVSS 8.2 · High EPSS 0.58% · P46
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一、 漏洞 CVE-2021-39134 基础信息

漏洞信息
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Vulnerability Title
UNIX Symbolic Link (Symlink) Following in @npmcli/arborist
来源: CVE Program / CVE List V5
Vulnerability Description
`@npmcli/arborist`, the library that calculates dependency trees and manages the `node_modules` folder hierarchy for the npm command line interface, aims to guarantee that package dependency contracts will be met, and the extraction of package contents will always be performed into the expected folder. This is, in part, accomplished by resolving dependency specifiers defined in `package.json` manifests for dependencies with a specific name, and nesting folders to resolve conflicting dependencies. When multiple dependencies differ only in the case of their name, Arborist's internal data structure saw them as separate items that could coexist within the same level in the `node_modules` hierarchy. However, on case-insensitive file systems (such as macOS and Windows), this is not the case. Combined with a symlink dependency such as `file:/some/path`, this allowed an attacker to create a situation in which arbitrary contents could be written to any location on the filesystem. For example, a package `pwn-a` could define a dependency in their `package.json` file such as `"foo": "file:/some/path"`. Another package, `pwn-b` could define a dependency such as `FOO: "file:foo.tgz"`. On case-insensitive file systems, if `pwn-a` was installed, and then `pwn-b` was installed afterwards, the contents of `foo.tgz` would be written to `/some/path`, and any existing contents of `/some/path` would be removed. Anyone using npm v7.20.6 or earlier on a case-insensitive filesystem is potentially affected. This is patched in @npmcli/arborist 2.8.2 which is included in npm v7.20.7 and above.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
CWE-61
来源: CVE Program / CVE List V5
Vulnerability Title
NPM arborist 后置链接漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
NPM arborist是美国npm（NPM）公司的一个软件包。用于可视化存储为平面列表的分层数据。 arborist 存在后置链接漏洞，该漏洞允许攻击者进行任意文件创建、任意文件覆盖和任意代码执行。
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
npm arborist < 2.8.2 -

二、漏洞 CVE-2021-39134 的公开POC

# POC 描述 源链接 神龙链接
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三、漏洞 CVE-2021-39134 的情报信息

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CVE-2021-39134 厂商安全公告 (3)

同批安全公告 · npm · 2021-08-31 · 共 5 条

CVE-2021-37701 8.2 HIGH node-tar 后置链接漏洞
CVE-2021-37712 8.2 HIGH node-tar 后置链接漏洞
CVE-2021-37713 8.2 HIGH node-tar 路径遍历漏洞
CVE-2021-39135 8.2 HIGH NPM arborist 后置链接漏洞

IV. Related Vulnerabilities

Same product: arborist
Same vendor: npm
Same weakness: CWE-61

V. Comments for CVE-2021-39134

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