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CVE-2021-43795— Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in com.linecorp.armeria:armeria

Quick assessment

Affected
line armeria
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.

Armeria是一款用于构建使用HTTP/2作为会话层协议的异步微服务器的开源库。 Armeria 存在路径遍历漏洞，该漏洞源于软件的路径验证逻辑存在问题。攻击者可以通过发送路径包含%2F（编码为/）的 HTTP 请求，例如/files/..%2Fsecrets.txt，访问其受限目录之外的 Armeria 服务器的本地文件系统， 绕过 Armeria 的路径验证逻辑。

CVSS 7.5 · High EPSS 1.69% · P76
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I. Basic Information for CVE-2021-43795

Vulnerability Information
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Vulnerability Title
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in com.linecorp.armeria:armeria
Source: CVE Program / CVE List V5
Vulnerability Description
Armeria is an open source microservice framework. In affected versions an attacker can access an Armeria server's local file system beyond its restricted directory by sending an HTTP request whose path contains `%2F` (encoded `/`), such as `/files/..%2Fsecrets.txt`, bypassing Armeria's path validation logic. Armeria 1.13.4 or above contains the hardened path validation logic that handles `%2F` properly. This vulnerability can be worked around by inserting a decorator that performs an additional validation on the request path.
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
Vulnerability Title
Armeria 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Armeria是一款用于构建使用HTTP/2作为会话层协议的异步微服务器的开源库。 Armeria 存在路径遍历漏洞，该漏洞源于软件的路径验证逻辑存在问题。攻击者可以通过发送路径包含%2F（编码为/）的 HTTP 请求，例如/files/..%2Fsecrets.txt，访问其受限目录之外的 Armeria 服务器的本地文件系统， 绕过 Armeria 的路径验证逻辑。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
line armeria < 1.13.4 -

II. Public POCs for CVE-2021-43795

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III. Intelligence Information for CVE-2021-43795

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Patches & Fixes for CVE-2021-43795 (2)

Vendor Advisories for CVE-2021-43795 (1)

IV. Related Vulnerabilities

Same product: armeria
Same vendor: line
Same weakness: CWE-22

V. Comments for CVE-2021-43795

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