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GHSA-h7vf-5wrv-9fhv
No affected components available
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.
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a low impact on the integrity of the data. There is a low impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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