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Information Disclosure Vulnerability in Privacy Center of SERVER_SIDE_FIDES_API_URL

Moderate severity GitHub Reviewed Published Jul 3, 2024 in ethyca/fides

Package

pip ethyca-fides (pip)

Affected versions

>= 2.19.0, < 2.39.2

Patched versions

2.39.2

Description

SERVER_SIDE_FIDES_API_URL is a server-side configuration environment variable used by the Fides Privacy Center to communicate with the Fides webserver backend. The value of this variable is a URL which typically includes a private IP address, private domain name, and/or port.

This vulnerability allows an unauthenticated attacker to make a HTTP GET request from the Privacy Center that discloses the value of this server-side URL.

Impact

Disclosure of server-side configuration giving an attacker information on server-side ports, private IP addresses, and/or private domain names.

Patches

The vulnerability has been patched in Fides version 2.39.2. Users are advised to upgrade to this version or later to secure their systems against this threat.

Workarounds

There are no workarounds.

Proof of Concept

  1. Set the value of the environment variable FIDES_PRIVACY_CENTER__SERVER_SIDE_FIDES_API_URL of your Fides Privacy Center container before start-up to a private value such as https://some.private.domain.name/api/v1 and start the Privacy Center application.

  2. Once the application is up, perform a HTTP GET request of the Privacy Center's main page e.g. https://privacy.example.com . The value of SERVER_SIDE_FIDES_API_URL is returned in the response's body.

~ ❯ curl -s https://privacy.example.com/ | \
grep '__NEXT_DATA__' | \
sed 's/.*<script id="__NEXT_DATA__" type="application\/json">//;s/<\/script>.*//' | \
jq '.props.serverEnvironment.settings.SERVER_SIDE_FIDES_API_URL'
"https://some.private.domain.name/api/v1"

References

@Kelsey-Ethyca Kelsey-Ethyca published to ethyca/fides Jul 3, 2024
Published by the National Vulnerability Database Jul 3, 2024
Published to the GitHub Advisory Database Jul 5, 2024
Reviewed Jul 5, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS score

0.043%
(10th percentile)

Weaknesses

CVE ID

CVE-2024-31223

GHSA ID

GHSA-53q7-4874-24qg

Source code

Credits

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