CVE-2021-32820 PoC — File disclosure in Express Handlebars

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-32820.yaml

Associated Vulnerability

Title:File disclosure in Express Handlebars (CVE-2021-32820)
Description:Express-handlebars is a Handlebars view engine for Express. Express-handlebars mixes pure template data with engine configuration options through the Express render API. More specifically, the layout parameter may trigger file disclosure vulnerabilities in downstream applications. This potential vulnerability is somewhat restricted in that only files with existing extentions (i.e. file.extension) can be included, files that lack an extension will have .handlebars appended to them. For complete details refer to the referenced GHSL-2021-018 report. Notes in documentation have been added to help users avoid this potential information exposure vulnerability.

Description

Express-handlebars is susceptible to local file inclusion because it mixes pure template data with engine configuration options through the Express render API. More specifically, the layout parameter may trigger file disclosure vulnerabilities in downstream applications. This potential vulnerability is somewhat restricted in that only files with existing extensions (i.e., file.extension) can be included. Files that lack an extension will have .handlebars appended to them. For complete details refer to the referenced GHSL-2021-018 report. Notes in documentation have been added to help users avoid this potential information exposure vulnerability.

File Snapshot


 id: CVE-2021-32820

info:
  name: Express-handlebars - Local File Inclusion
  author: dhiyaneshDk
  

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