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GHSA-h7vf-5wrv-9fhvmedium5.9

Symfony storing cookie headers in HttpCache

Impact

The Symfony HTTP cache system acts as a reverse proxy: it caches HTTP responses (including headers) and returns them to clients.

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

symfony/http-kernel Packagist
Affected rangeRecorded fix
From 2.0.0 before 4.4.50Ecosystem versions4.4.50
From 5.0.0 before 5.4.20Ecosystem versions5.4.20
From 6.0.0 before 6.0.20Ecosystem versions6.0.20
From 6.1.0 before 6.1.12Ecosystem versions6.1.12
From 6.2.0 before 6.2.6Ecosystem versions6.2.6

Version evidence: OSV · GHSA-h7vf-5wrv-9fhv

View original version evidence (617 explicit versions)
symfony/symfony Packagist
Affected rangeRecorded fix
From 2.0.0 before 4.4.50Ecosystem versions4.4.50
From 5.0.0 before 5.4.20Ecosystem versions5.4.20
From 6.0.0 before 6.0.20Ecosystem versions6.0.20
From 6.1.0 before 6.1.12Ecosystem versions6.1.12
From 6.2.0 before 6.2.6Ecosystem versions6.2.6

Version evidence: OSV · GHSA-h7vf-5wrv-9fhv

View original version evidence (632 explicit versions)

Original source description

Description

The Symfony HTTP cache system acts as a reverse proxy: it caches HTTP responses (including headers) and returns them to clients.

In a recent AbstractSessionListener change, the response might now contain a Set-Cookie header. If the Symfony HTTP cache system is enabled, this header might be stored and returned to some other clients. An attacker can use this vulnerability to retrieve the victim's session.

Resolution

The HttpStore constructor now takes a parameter containing a list of private headers that are removed from the HTTP response headers. The default value for this parameter is Set-Cookie, but it can be overridden or extended by the application.

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

Credits

We would like to thank Soner Sayakci for reporting the issue and Nicolas Grekas for fixing it.

References