CVE-2023-46734

Description

Some Twig filters in CodeExtension use "is_safe=html" but don't actually ensure their input is safe.

Resolution

Symfony now escapes the output of the affected filters.

The patch for this issue is available here for branch 4.4.

Credits

We would like to thank Pierre Rudloff for reporting the issue and to Nicolas Grekas for providing the fix.

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Starting in versions 2.0.0, 5.0.0, and 6.0.0 and prior to versions 4.4.51, 5.4.31, and 6.3.8, some Twig filters in CodeExtension use is_safe=html but don't actually ensure their input is safe. As of versions 4.4.51, 5.4.31, and 6.3.8, Symfony now escapes the output of the affected filters.

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Starting in versions 2.0.0, 5.0.0, and 6.0.0 and prior to versions 4.4.51, 5.4.31, and 6.3.8, some Twig filters in CodeExtension use is_safe=html but don't actually ensure their input is safe. As of versions 4.4.51, 5.4.31, and 6.3.8, Symfony now escapes the output of the affected filters.

Soner Sayakci discovered that Symfony incorrectly handled cookie storage in the web cache. An attacker could possibly use this issue to obtain sensitive information and access unauthorized resources. (CVE-2022-24894)

Marco Squarcina discovered that Symfony incorrectly handled the storage of user session information. An attacker could possibly use this issue to perform a cross-site request forgery (CSRF) attack. (CVE-2022-24895)

Pierre Rudloff discovered that Symfony incorrectly checked HTML input. An attacker could possibly use this issue to perform cross site scripting. (CVE-2023-46734)

Vladimir Dusheyko discovered that Symfony incorrectly sanitized special input with a PHP directive in URL query strings. An attacker could possibly use this issue to expose sensitive information or cause a denial of service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 22.04 LTS. (CVE-2024-50340)

Oleg Andreyev, Antoine Makdessi, and Moritz Rauch discovered that Symfony incorrectly handled user authentication. An attacker could possibly use this issue to access unauthorized resources and expose sensitive information. This issue was only addressed in Ubuntu 24.04 LTS. (CVE-2024-50341, CVE-2024-51996)

Linus Karlsson and Chris Smith discovered that Symfony returned internal host information during host resolution. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 24.04 LTS and Ubuntu 22.04 LTS. (CVE-2024-50342)

It was discovered that Symfony incorrectly parsed user input through regular expressions. An attacker could possibly use this issue to expose sensitive information. (CVE-2024-50343)

Sam Mush discovered that Symfony incorrectly parsed URIs with special characters. An attacker could possibly use this issue to perform phishing attacks. (CVE-2024-50345)