CVE-2021-39197 – better_errors

Package

Manager: gem
Name: better_errors
Vulnerable Version: >=0 <2.8.0

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00212 pctl0.43767

Details

Older releases of better_errors open to Cross-Site Request Forgery attack ### Impact better_errors prior to 2.8.0 did not implement CSRF protection for its internal requests. It also did not enforce the correct "Content-Type" header for these requests, which allowed a cross-origin "simple request" to be made without CORS protection. These together left an application with better_errors enabled open to cross-origin attacks. _As a developer tool, better_errors documentation strongly recommends addition only to the `development` bundle group, so this vulnerability should only affect development environments. Please ensure that your project limits better_errors to the `development` group (or the non-Rails equivalent)._ ### Patches Starting with release 2.8.x, CSRF protection is enforced. It is recommended that you upgrade to the latest release, or minimally to "~> 2.8.3". ### Workarounds There are no known workarounds to mitigate the risk of using older releases of better_errors. ### References - Chris Moberly provided [an example attack that uses a now-patched vulnerability of webpack-dev-server in conjunction with Better Errors](https://about.gitlab.com/blog/2021/09/07/why-are-developers-vulnerable-to-driveby-attacks/) ### For more information If you have any questions or comments about this advisory, please - Add to the [discussion in better_errors](https://github.com/BetterErrors/better_errors/discussions/507) - Open an issue in [better_errors](https://github.com/BetterErrors/better_errors)

Metadata

Created: 2021-09-07T23:08:24Z
Modified: 2021-09-08T14:47:05Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/09/GHSA-w3j4-76qw-wwjm/GHSA-w3j4-76qw-wwjm.json
CWE IDs: ["CWE-352"]
Alternative ID: GHSA-w3j4-76qw-wwjm
Finding: F007
Auto approve: 1