Bug 1480618 - (CVE-2017-7674) CVE-2017-7674 tomcat: Vary header not added by CORS filter leading to cache poisoning
CVE-2017-7674 tomcat: Vary header not added by CORS filter leading to cache p...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
: Security
Depends On: 1480619 1480620 1480621 1495654 1495655
Blocks: 1480628
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Reported: 2017-08-11 09:58 EDT by Adam Mariš
Modified: 2018-06-01 17:41 EDT (History)
59 users (show)

See Also:
Fixed In Version: tomcat 7.0.79, tomcat 8.0.45, tomcat 8.5.16
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Doc Text:
A vulnerability was discovered in Tomcat where the CORS Filter did not send a "Vary: Origin" HTTP header. This potentially allowed sensitive data to be leaked to other visitors through both client-side and server-side caches.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:3081 normal SHIPPED_LIVE Important: tomcat security update 2017-10-30 00:26:54 EDT

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Description Adam Mariš 2017-08-11 09:58:56 EDT
The CORS Filter did not add an HTTP Vary header indicating that the response varies depending on Origin. This permitted client and server side cache poisoning in some circumstances.

Affected versions: 7.0.41 to 7.0.78, 8.0.0.RC1 to 8.0.44, 8.5.0 to 8.5.15

Upstream patches:

Tomcat 7: https://svn.apache.org/viewvc?view=revision&revision=1795816
Tomcat 8.0.x: https://svn.apache.org/viewvc?view=revision&revision=1795815
Tomcat 8.5.x: https://svn.apache.org/viewvc?view=revision&revision=1795814

External References:

Comment 1 Adam Mariš 2017-08-11 10:00:32 EDT
Created jbossweb tracking bugs for this issue:

Affects: openshift-1 [bug 1480619]

Created tomcat tracking bugs for this issue:

Affects: epel-6 [bug 1480621]
Affects: fedora-all [bug 1480620]
Comment 3 Jason Shepherd 2017-08-21 21:46:40 EDT
EAP 6 doesn't not contain the vulnerable CORSFilter. Any products based on EAP 6 would not be affected, unless they add the CORSFilter in their layered code.

Comment 5 errata-xmlrpc 2017-10-29 20:28:39 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:3081 https://access.redhat.com/errata/RHSA-2017:3081

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