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In Symfony (symfony/http-kernel; Symfony 4.4 branch), a change in AbstractSessionListener could result in responses containing a Set-Cookie header. When Symfony’s HTTP cache system (HttpCache reverse proxy) is enabled, it may cache entire responses including headers and subsequently replay the cached Set-Cookie header to other clients. This can expose a victim’s session cookie to a different client, enabling session disclosure and potential session hijacking. The issue is patched in Symfony 4.4.50+ (commit d2f6322af9444ac5cd1ef3ac6f280dbef7f9d1fb).
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Set-Cookie header containing session information may be stored by HttpCache and returned to other clients, allowing an attacker to obtain a victim’s session cookie and potentially impersonate the victim.If you can’t patch tonight, do this now.
Set-Cookie as a private header and strip it from cached responses (ensure Set-Cookie is included in the private headers list). If immediate upgrade is not possible, override/extend HttpStore private headers configuration to remove Set-Cookie from cacheable responses.Patch, then assume compromise.
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