CVE-2021-39135— 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。 NPM arborist 存在后置链接漏洞，该漏洞源于网络系统或产品的代码开发过程中存在设计或实现不当的问题。
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一、 漏洞 CVE-2021-39135 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 accomplished by extracting package contents into a project's `node_modules` folder. If the `node_modules` folder of the root project or any of its dependencies is somehow replaced with a symbolic link, it could allow Arborist to write package dependencies to any arbitrary location on the file system. Note that symbolic links contained within package artifact contents are filtered out, so another means of creating a `node_modules` symbolic link would have to be employed. 1. A `preinstall` script could replace `node_modules` with a symlink. (This is prevented by using `--ignore-scripts`.) 2. An attacker could supply the target with a git repository, instructing them to run `npm install --ignore-scripts` in the root. This may be successful, because `npm install --ignore-scripts` is typically not capable of making changes outside of the project directory, so it may be deemed safe. This is patched in @npmcli/arborist 2.8.2 which is included in npm v7.20.7 and above. For more information including workarounds please see the referenced GHSA-gmw6-94gg-2rc2.
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。 NPM arborist 存在后置链接漏洞，该漏洞源于网络系统或产品的代码开发过程中存在设计或实现不当的问题。
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-2021-39135 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2021-39135 厂商安全公告 (3)
-
https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISC
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https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf x_refsource_CONFIRM
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https://github.com/npm/arborist/security/advisories/GHSA-gmw6-94gg-2rc2 x_refsource_CONFIRM
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-2021-39134 | 8.2 HIGH | NPM arborist 后置链接漏洞 |
IV. Related Vulnerabilities
Same product: arborist
V. Comments for CVE-2021-39135
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