Symfony storing cookie headers in HttpCache

Summary

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The Symfony HTTP cache system, acts as a reverse proxy: It caches entire responses (including headers) and returns them to the clients. In a recent change in the `AbstractSessionListener`, the response might contain a `Set-Cookie` header. If the Symfony HTTP cache system is enabled, this response might bill stored and return to the next clients. An attacker can use this vulnerability to retrieve the victim's session. This issue has been patched and is available for branch 4.4.

Timeline

1. Feb 3, 2023, 9:46 PM UTCCVE published
2. Mar 10, 2025, 8:58 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Mar 10, 2025, 9:16 PM UTCRecord last updated

Affected versions

• symfony symfony

  From 2.0.0 · fixed in 4.4.50; From 5.0.0 · fixed in 5.4.20; From 6.0.0 · fixed in 6.0.20; From 6.1.0 · fixed in 6.1.12; From 6.2.0 · fixed in 6.2.6

• symfony/http-kernelPackagist

  From 2.0.0 · fixed in 4.4.50

• symfony/http-kernelPackagist

  From 5.0.0 · fixed in 5.4.20

• symfony/http-kernelPackagist

  From 6.0.0 · fixed in 6.0.20

• symfony/http-kernelPackagist

  From 6.1.0 · fixed in 6.1.12

• symfony/http-kernelPackagist

  From 6.2.0 · fixed in 6.2.6

• symfony/symfonyPackagist

  From 2.0.0 · fixed in 4.4.50

• symfony/symfonyPackagist

  From 5.0.0 · fixed in 5.4.20

• symfony/symfonyPackagist

  From 6.0.0 · fixed in 6.0.20

• symfony/symfonyPackagist

  From 6.1.0 · fixed in 6.1.12

• symfony/symfonyPackagist

  From 6.2.0 · fixed in 6.2.6

References 4