CVE-2024-45388: Arbitrary file read in the `/api/v2/simulation` endpoint in hoverfly (`GHSL-2023-274`)

Vulnerability summary

CVE-2024-45388 is a high (CVSS 7.5) vulnerability in hoverfly. EPSS estimates a 55.57% chance of exploitation in the next 30 days, higher than 99% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 02-09-2024
   PublishedVulnerability first disclosed.
2. 03-09-2024
   Last modifiedVulnerability information updated.

Description

Hoverfly is a lightweight service virtualization/ API simulation / API mocking tool for developers and testers. The `/api/v2/simulation` POST handler allows users to create new simulation views from the contents of a user-specified file. This feature can be abused by an attacker to read arbitrary files from the Hoverfly server. Note that, although the code prevents absolute paths from being specified, an attacker can escape out of the `hf.Cfg.ResponsesBodyFilesPath` base path by using `../` segments and reach any arbitrary files. This issue was found using the Uncontrolled data used in path expression CodeQL query for python. Users are advised to make sure the final path (`filepath.Join(hf.Cfg.ResponsesBodyFilesPath, filePath)`) is contained within the expected base path (`filepath.Join(hf.Cfg.ResponsesBodyFilesPath, "/")`). This issue is also tracked as GHSL-2023-274.

• CWE-200Exposure of Sensitive Information to an Unauthorized ActorThe product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
• CWE-22Improper Limitation of a Pathname to a Restricted DirectoryThe product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.