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CVE-2021-4287— ReFirm Labs binwalk Archive Extraction extractor.py symlink

Quick assessment

Affected
ReFirm Labs binwalk
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.

Binwalk是ReFirm Labs开源的一种快速、易于使用的工具。用于分析、逆向工程和提取固件图像。 ReFirm Labs Binwalk 2.3.2之前版本存在安全漏洞，该漏洞源于组件 Archive Extraction Handler 的文件 src/binwalk/modules/extractor.py 的一个未知函数，操作导致符号链接跟随。

CVSS 5.0 · Medium EPSS 1.95% · P79

Possible ATT&CK Techniques 1 AI

T1105 · Ingress Tool Transfer
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I. Basic Information for CVE-2021-4287

Vulnerability Information
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Vulnerability Title
ReFirm Labs binwalk Archive Extraction extractor.py symlink
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability, which was classified as problematic, was found in ReFirm Labs binwalk up to 2.3.2. Affected is an unknown function of the file src/binwalk/modules/extractor.py of the component Archive Extraction Handler. The manipulation leads to symlink following. It is possible to launch the attack remotely. Upgrading to version 2.3.3 is able to address this issue. The name of the patch is fa0c0bd59b8588814756942fe4cb5452e76c1dcd. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216876.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
ReFirm Labs Binwalk 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Binwalk是ReFirm Labs开源的一种快速、易于使用的工具。用于分析、逆向工程和提取固件图像。 ReFirm Labs Binwalk 2.3.2之前版本存在安全漏洞，该漏洞源于组件 Archive Extraction Handler 的文件 src/binwalk/modules/extractor.py 的一个未知函数，操作导致符号链接跟随。
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
ReFirm Labs binwalk 2.3.0 -

II. Public POCs for CVE-2021-4287

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III. Intelligence Information for CVE-2021-4287

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Patches & Fixes for CVE-2021-4287 (2)

Vendor Advisories for CVE-2021-4287 (2)

Other References for CVE-2021-4287 (1)

IV. Related Vulnerabilities

Same product: binwalk
Same vendor: ReFirm Labs
Same weakness: CWE-61

V. Comments for CVE-2021-4287

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