CVE-2023-35926: backstage Code Injection

Vulnerability summary

CVE-2023-35926 is a critical (CVSS 9.9) Code Injection vulnerability in backstage. EPSS estimates a 1.89% chance of exploitation in the next 30 days, higher than 79.1% of scored vulnerabilities.

Timeline

1. 22-06-2023
   PublishedVulnerability first disclosed.
2. 05-12-2024
   Last modifiedVulnerability information updated.

Description

Backstage is an open platform for building developer portals. The Backstage scaffolder-backend plugin uses a templating library that requires sandbox, as it by design allows for code injection. The library used for this sandbox so far has been `vm2`, but in light of several past vulnerabilities and existing vulnerabilities that may not have a fix, the plugin has switched to using a different sandbox library. A malicious actor with write access to a registered scaffolder template could manipulate the template in a way that allows for remote code execution on the scaffolder-backend instance. This was only exploitable in the template YAML definition itself and not by user input data. This is vulnerability is fixed in version 1.15.0 of `@backstage/plugin-scaffolder-backend`.

• CWE-94Improper Control of Generation of Code ('Code Injection')The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.