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CVE-2022-41720— Restricted file access on Windows in os and net/http

Quick assessment

Affected
Go standard library os
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.

Google Golang是美国谷歌（Google）公司的一种静态强类型、编译型语言。Go的语法接近C语言，但对于变量的声明有所不同。Go支持垃圾回收功能。Go的并行模型是以东尼·霍尔的通信顺序进程（CSP）为基础，采取类似模型的其他语言包括Occam和Limbo，但它也具有Pi运算的特征，比如通道传输。在1.8版本中开放插件（Plugin）的支持，这意味着现在能从Go中动态加载部分函数。 Google Golang 1.18.9之前版本、1.19.4之前版本、1.19.0版本存在安全漏洞，该漏洞源于os

AI Predicted 8.6 Difficulty: Moderate EPSS 1.23% · P68

Possible ATT&CK Techniques 1 AI

T1552.002 · Credentials in Registry
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I. Basic Information for CVE-2022-41720

Vulnerability Information
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Vulnerability Title
Restricted file access on Windows in os and net/http
Source: CVE Program / CVE List V5
Vulnerability Description
On Windows, restricted files can be accessed via os.DirFS and http.Dir. The os.DirFS function and http.Dir type provide access to a tree of files rooted at a given directory. These functions permit access to Windows device files under that root. For example, os.DirFS("C:/tmp").Open("COM1") opens the COM1 device. Both os.DirFS and http.Dir only provide read-only filesystem access. In addition, on Windows, an os.DirFS for the directory (the root of the current drive) can permit a maliciously crafted path to escape from the drive and access any path on the system. With fix applied, the behavior of os.DirFS("") has changed. Previously, an empty root was treated equivalently to "/", so os.DirFS("").Open("tmp") would open the path "/tmp". This now returns an error.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Golang 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Golang是美国谷歌（Google）公司的一种静态强类型、编译型语言。Go的语法接近C语言，但对于变量的声明有所不同。Go支持垃圾回收功能。Go的并行模型是以东尼·霍尔的通信顺序进程（CSP）为基础，采取类似模型的其他语言包括Occam和Limbo，但它也具有Pi运算的特征，比如通道传输。在1.8版本中开放插件（Plugin）的支持，这意味着现在能从Go中动态加载部分函数。 Google Golang 1.18.9之前版本、1.19.4之前版本、1.19.0版本存在安全漏洞，该漏洞源于os
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
Go standard library os 0 ~ 1.18.9 -
Go standard library net/http 0 ~ 1.18.9 -

II. Public POCs for CVE-2022-41720

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III. Intelligence Information for CVE-2022-41720

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Other References for CVE-2022-41720 (4)

IV. Related Vulnerabilities

Same product: os
Same vendor: Go standard library

V. Comments for CVE-2022-41720

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