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Symfony possible session fixation vulnerability

Moderate severity GitHub Reviewed Published Nov 10, 2023 in symfony/symfony • Updated Nov 12, 2023

Package

composer symfony/security-http (Composer)

Affected versions

>= 5.4.21, < 5.4.31
>= 6.2.7, < 6.3.8

Patched versions

5.4.31
6.3.8
composer symfony/symfony (Composer)
>= 5.4.21, < 5.4.31
>= 6.2.7, < 6.3.8
5.4.31
6.3.8

Description

Description

SessionStrategyListener does not always migrate the session after a successful login. It only migrate the session when the logged-in user identifier changes. In some use cases, the user identifier doesn't change between the verification phase and the successful login, while the token itself changes from one type (partially-authenticated) to another (fully-authenticated). When this happens, the session id should be regenerated to prevent possible session fixations.

Resolution

Symfony now checks the type of the token in addition to the user identifier before deciding whether the session id should be regenerated.

The patch for this issue is available here for branch 5.4.

Credits

We would like to thank Robert Meijers for reporting the issue and providing the fix.

References

@nicolas-grekas nicolas-grekas published to symfony/symfony Nov 10, 2023
Published by the National Vulnerability Database Nov 10, 2023
Published to the GitHub Advisory Database Nov 12, 2023
Reviewed Nov 12, 2023
Last updated Nov 12, 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
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
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:L/UI:N/S:U/C:N/I:H/A:N

EPSS score

0.108%
(45th percentile)

Weaknesses

CVE ID

CVE-2023-46733

GHSA ID

GHSA-m2wj-r6g3-fxfx

Source code

Credits

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