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CVE-2021-32804— Arbitrary File Creation/Overwrite due to insufficient absolute path sanitization

Quick assessment

Affected
npm node-tar
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 8.2 · High EPSS 15.13% · P97
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I. Basic Information for CVE-2021-32804

Vulnerability Information
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Vulnerability Title
Arbitrary File Creation/Overwrite due to insufficient absolute path sanitization
Source: 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.
Source: 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
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
node-tar 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
npm node-tar < 3.2.2 -

II. Public POCs for CVE-2021-32804

# POC Description Source Link Shenlong Link
1 None https://github.com/yamory/CVE-2021-32804 POC Details
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III. Intelligence Information for CVE-2021-32804

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Patches & Fixes for CVE-2021-32804 (1)

Vendor Advisories for CVE-2021-32804 (3)

Other References for CVE-2021-32804 (2)

IV. Related Vulnerabilities

Same product: node-tar
Same vendor: npm
Same weakness: CWE-22

V. Comments for CVE-2021-32804

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