Description
The npm hbs package is an Express view engine wrapper for Handlebars. Depending on usage, users of hbs may be vulnerable to a file disclosure vulnerability. There is currently no patch for this vulnerability. hbs mixes pure template data with engine configuration options through the Express render API. By overwriting internal configuration options a file disclosure vulnerability may be triggered in downstream applications. For an example PoC see the referenced GHSL-2021-020.
Remediation
References
https://securitylab.github.com/advisories/GHSL-2021-020-pillarjs-hbs/
Related Vulnerabilities
CVE-2015-8031 Vulnerability in maven package org.jvnet.hudson.main:hudson-core
CVE-2021-21254 Vulnerability in npm package @ckeditor/ckeditor5-markdown-gfm
CVE-2017-16198 Vulnerability in npm package ritp
CVE-2010-1330 Vulnerability in maven package org.jruby.jcodings:jcodings
CVE-2020-36181 Vulnerability in maven package com.fasterxml.jackson.core:jackson-databind