Bug 1822707 (CVE-2020-5255)

Summary: CVE-2020-5255 php-symfony: Response without Content-Type header could result in cache poisoning
Product: [Other] Security Response Reporter: Michael Kaplan <mkaplan>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED UPSTREAM QA Contact:
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Priority: low    
Version: unspecifiedCC: fedora, shawn
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2020-04-09 22:31:48 UTC Type: ---
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Bug Depends On: 1822708    
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Description Michael Kaplan 2020-04-09 16:36:25 UTC 
In Symfony before versions 4.4.7 and 5.0.7, when a `Response` does not contain a `Content-Type` header, affected versions of Symfony can fallback to the format defined in the `Accept` header of the request, leading to a possible mismatch between the `response`s content and `Content-Type` header. When the response is cached, this can prevent the use of the website by other users. This has been patched in versions 4.4.7 and 5.0.7.
Comment 1 Michael Kaplan 2020-04-09 16:36:28 UTC 
External References:

https://github.com/symfony/symfony/security/advisories/GHSA-mcx4-f5f5-4859
Comment 2 Michael Kaplan 2020-04-09 16:36:46 UTC 
Created php-symfony4 tracking bugs for this issue:

Affects: fedora-all [bug 1822708]
Comment 3 Product Security DevOps Team 2020-04-09 22:31:48 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.