Inconsistent interpretation of HTTP requests in Symfony http-kernel



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-41267
CWE-ID CWE-444
Exploitation vector Network
Public exploit N/A
Vulnerable software
 http-kernel
Web applications / Modules and components for CMS

Vendor Symfony

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU58370

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-41267

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No

Description

The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

http-kernel: 5.2.0 BETA1 - 5.3.11

CPE2.3 External links

https://github.com/symfony/symfony/security/advisories/GHSA-q3j3-w37x-hq2q
https://github.com/symfony/symfony/releases/tag/v5.3.12
https://github.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487
https://github.com/symfony/symfony/pull/44243


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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