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CVE-2021-48011— Servor 1.0.0 through 4.0.2 Unauthenticated Path Traversal via URL-Encoded Dot Segments

Quick assessment

Affected
lukejacksonn servor
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Servor 1.0.0 至 4.0.2 版本中存在一个路径穿越漏洞。攻击者无需身份认证，即可通过发送 URL 编码的“点”序列（如 %2e%2e/）绕过所服务根目录的限制。由于 在 和 函数中先于 执行，攻击者可利用此顺序问题读取根目录外的任意文件，并列出其内容。

CVSS 7.5 · High
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I. Basic Information for CVE-2021-48011

Vulnerability Information
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Vulnerability Title
Servor 1.0.0 through 4.0.2 Unauthenticated Path Traversal via URL-Encoded Dot Segments
Source: CVE Program / CVE List V5
Vulnerability Description
Servor 1.0.0 through 4.0.2 contains a path traversal vulnerability that allows unauthenticated remote attackers to escape the served root by sending URL-encoded dot segments. Attackers can send %2e%2e/ sequences, which decodeURI() decodes before path.join() in serveStaticFile and serveDirectoryListing, to read arbitrary files and list directories outside the root.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
lukejacksonn servor 1.0.0 ~ 4.0.2 -

II. Public POCs for CVE-2021-48011

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2021-48011

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Patches & Fixes for CVE-2021-48011 (2)

Vendor Advisories for CVE-2021-48011 (1)

Other References for CVE-2021-48011 (1)

IV. Related Vulnerabilities

Same weakness: CWE-22

V. Comments for CVE-2021-48011

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