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User enumeration leak using switch user functionality in Symfony

Moderate severity GitHub Reviewed Published Dec 2, 2019 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

composer symfony/security-http (Composer)

Affected versions

>= 4.1.0, < 4.2.12
>= 4.3.0, < 4.3.8

Patched versions

4.2.12
4.3.8
composer symfony/symfony (Composer)
>= 4.1.0, < 4.2.12
>= 4.3.0, < 4.3.8
4.2.12
4.3.8

Description

An issue was discovered in Symfony 4.2.0 to 4.2.11 and 4.3.0 to 4.3.7. The ability to enumerate users was possible due to different handling depending on whether the user existed when making unauthorized attempts to use the switch users functionality. This is related to symfony/security.

References

Published by the National Vulnerability Database Nov 21, 2019
Reviewed Dec 1, 2019
Published to the GitHub Advisory Database Dec 2, 2019
Last updated Feb 1, 2023

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

0.167%
(54th percentile)

Weaknesses

CVE ID

CVE-2019-18886

GHSA ID

GHSA-4vpc-5jx4-cfqg

Source code

No known source code
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