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CVE-2021-37701— node-tar 后置链接漏洞

一分钟漏洞结论

影响对象
npm node-tar
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。

node-tar是一款用于文件压缩/解压缩的软件包。 Node-tar 中存在后置链接漏洞，该漏洞源于产品未对特殊字符做有效验证。攻击者可通过该漏洞在其他路径创建恶意文件。

CVSS 8.2 · High EPSS 3.29% · P88
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一、 漏洞 CVE-2021-37701 基础信息

漏洞信息
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Vulnerability Title
Arbitrary File Creation/Overwrite via insufficient symlink protection due to directory cache poisoning using symbolic links
来源: CVE Program / CVE List V5
Vulnerability Description
The npm package "tar" (aka node-tar) before versions 4.4.16, 5.0.8, and 6.1.7 has an arbitrary file creation/overwrite and arbitrary code execution vulnerability. node-tar aims to guarantee that any file whose location would be modified by a symbolic link is not extracted. This is, in part, achieved by ensuring that extracted directories are not symlinks. Additionally, in order to prevent unnecessary stat calls to determine whether a given path is a directory, paths are cached when directories are created. This logic was insufficient when extracting tar files that contained both a directory and a symlink with the same name as the directory, where the symlink and directory names in the archive entry used backslashes as a path separator on posix systems. The cache checking logic used both `\` and `/` characters as path separators, however `\` is a valid filename character on posix systems. By first creating a directory, and then replacing that directory with a symlink, it was thus possible to bypass node-tar symlink checks on directories, essentially allowing an untrusted tar file to symlink into an arbitrary location and subsequently extracting arbitrary files into that location, thus allowing arbitrary file creation and overwrite. Additionally, a similar confusion could arise on case-insensitive filesystems. If a tar archive contained a directory at `FOO`, followed by a symbolic link named `foo`, then on case-insensitive file systems, the creation of the symbolic link would remove the directory from the filesystem, but _not_ from the internal directory cache, as it would not be treated as a cache hit. A subsequent file entry within the `FOO` directory would then be placed in the target of the symbolic link, thinking that the directory had already been created. These issues were addressed in releases 4.4.16, 5.0.8 and 6.1.7. The v3 branch of node-tar has been deprecated and did not receive patches for these issues. If you are still using a v3 release we recommend you update to a more recent version of node-tar. If this is not possible, a workaround is available in the referenced GHSA-9r2w-394v-53qc.
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 后置链接漏洞
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 中存在后置链接漏洞，该漏洞源于产品未对特殊字符做有效验证。攻击者可通过该漏洞在其他路径创建恶意文件。
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 node-tar < 4.4.16 -

二、漏洞 CVE-2021-37701 的公开POC

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三、漏洞 CVE-2021-37701 的情报信息

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CVE-2021-37701 厂商安全公告 (4)

CVE-2021-37701 邮件列表归档 (1)

CVE-2021-37701 其他参考 (1)

同批安全公告 · npm · 2021-08-31 · 共 5 条

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
CVE-2021-39135 8.2 HIGH NPM arborist 后置链接漏洞

IV. Related Vulnerabilities

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

V. Comments for CVE-2021-37701

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