[SECURITY] CVE-2017-7674 Apache Tomcat Cache Poisoning

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[SECURITY] CVE-2017-7674 Apache Tomcat Cache Poisoning

markt
CVE-2017-7674 Apache Tomcat Cache Poisoning

Severity: Moderate

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 9.0.0.M1 to 9.0.0.M21
Apache Tomcat 8.5.0 to 8.5.15
Apache Tomcat 8.0.0.RC1 to 8.0.44
Apache Tomcat 7.0.41 to 7.0.78

Description:
The CORS Filter did not an HTTP Vary header indicating that the response
varies depending on Origin. This permitted client and server side cache
poisoning in some circumstances.

Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 9.0.0.M22 or later
- Upgrade to Apache Tomcat 8.5.16 or later
- Upgrade to Apache Tomcat 8.0.45 or later
- Upgrade to Apache Tomcat 7.0.79 or later

Credit:
The issue was reported as Bug 61101 and the security implications
identified by the Apache Tomcat Security Team.

History:
2017-08-10 Original advisory

References:
[1] http://tomcat.apache.org/security-9.html
[2] http://tomcat.apache.org/security-8.html
[3] http://tomcat.apache.org/security-7.html
[4] https://bz.apache.org/bugzilla/show_bug.cgi?id=61101

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