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Symfony vulnerable to denial of service via a malicious HTTP Host header

High severity GitHub Reviewed Published May 30, 2024 to the GitHub Advisory Database

Package

composer symfony/http-foundation (Composer)

Affected versions

>= 2.0.0, < 2.3.19
>= 2.4.0, < 2.4.9
>= 2.5.0, < 2.5.4

Patched versions

2.3.19
2.4.9
2.5.4
composer symfony/symfony (Composer)
>= 2.0.0, < 2.3.19
>= 2.4.0, < 2.4.9
>= 2.5.0, < 2.5.4
2.3.19
2.4.9
2.5.4

Description

All 2.0.X, 2.1.X, 2.2.X, 2.3.X, 2.4.X, and 2.5.X versions of the Symfony HttpFoundation component are affected by this security issue.

This issue has been fixed in Symfony 2.3.19, 2.4.9, and 2.5.4. Note that no fixes are provided for Symfony 2.0, 2.1, and 2.2 as they are not maintained anymore.

Description
When an arbitrarily long hostname is sent by a client, its parsing in Request::getHost() can lead to a DoS attack, due to the way we validate the hostname via a regular expression.

Resolution
The regular expression used to parse and validate the hostname from the HTTP request has been modified to avoid too much sensitivity to the submitted value length.

The patch for this issue is available here: symfony/symfony#11828

References

Published to the GitHub Advisory Database May 30, 2024
Reviewed May 30, 2024

Severity

High

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
None
Integrity
None
Availability
High

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:N/I:N/A:H

Weaknesses

CVE ID

CVE-2014-5244

GHSA ID

GHSA-v77v-x634-9m56

Source code

No known source code
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