CVE-2021-32804— node-tar 路径遍历漏洞
一分钟漏洞结论
影响对象
npm node-tar
利用判断
存在公开或 AI PoC，应优先验证
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。
node-tar是一款用于文件压缩/解压缩的软件包。 node-tar 存在路径遍历漏洞，该漏洞源于绝对路径清理不足而具有任意文件创建/覆盖漏洞。
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一、 漏洞 CVE-2021-32804 基础信息
漏洞信息
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Vulnerability Title
Arbitrary File Creation/Overwrite due to insufficient absolute path sanitization
来源: CVE Program / CVE List V5
Vulnerability Description
The npm package "tar" (aka node-tar) before versions 6.1.1, 5.0.6, 4.4.14, and 3.3.2 has a arbitrary File Creation/Overwrite vulnerability due to insufficient absolute path sanitization. node-tar aims to prevent extraction of absolute file paths by turning absolute paths into relative paths when the `preservePaths` flag is not set to `true`. This is achieved by stripping the absolute path root from any absolute file paths contained in a tar file. For example `/home/user/.bashrc` would turn into `home/user/.bashrc`. This logic was insufficient when file paths contained repeated path roots such as `////home/user/.bashrc`. `node-tar` would only strip a single path root from such paths. When given an absolute file path with repeating path roots, the resulting path (e.g. `///home/user/.bashrc`) would still resolve to an absolute path, thus allowing arbitrary file creation and overwrite. This issue was addressed in releases 3.2.2, 4.4.14, 5.0.6 and 6.1.1. Users may work around this vulnerability without upgrading by creating a custom `onentry` method which sanitizes the `entry.path` or a `filter` method which removes entries with absolute paths. See referenced GitHub Advisory for details. Be aware of CVE-2021-32803 which fixes a similar bug in later versions of tar.
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
对路径名的限制不恰当(路径遍历)
来源: CVE Program / CVE List V5
Vulnerability Title
node-tar 路径遍历漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
node-tar是一款用于文件压缩/解压缩的软件包。 node-tar 存在路径遍历漏洞，该漏洞源于绝对路径清理不足而具有任意文件创建/覆盖漏洞。
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-2021-32804 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|---|---|---|
| 1 | None | https://github.com/yamory/CVE-2021-32804 | POC详情 |
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CVE-2021-32804 补丁与修复 (1)
CVE-2021-32804 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/node-tar/security/advisories/GHSA-3jfq-g458-7qm9 x_refsource_CONFIRM
CVE-2021-32804 其他参考 (2)
-
https://www.npmjs.com/package/tar x_refsource_MISC
-
https://www.npmjs.com/advisories/1770 x_refsource_MISC
IV. Related Vulnerabilities
V. Comments for CVE-2021-32804
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