Description
It was discovered that a programming error in the processing of HTTPS requests in the Apache Tomcat servlet and JSP engine may result in denial of service via an infinite loop. The denial of service is easily achievable as a consequence of backporting a CVE-2016-6816 fix but not backporting the fix for Tomcat bug 57544. Distributions affected by this backporting issue include Debian (before 7.0.56-3+deb8u8 and 8.0.14-1+deb8u7 in jessie) and Ubuntu.
Remediation
References
http://rhn.redhat.com/errata/RHSA-2017-0517.html
http://rhn.redhat.com/errata/RHSA-2017-0826.html
http://rhn.redhat.com/errata/RHSA-2017-0827.html
http://rhn.redhat.com/errata/RHSA-2017-0828.html
http://rhn.redhat.com/errata/RHSA-2017-0829.html
http://www.debian.org/security/2017/dsa-3787
http://www.debian.org/security/2017/dsa-3788
http://www.securityfocus.com/bid/96293
http://www.securitytracker.com/id/1037860
https://bugs.debian.org/851304
https://bz.apache.org/bugzilla/show_bug.cgi?id=60578
https://lists.apache.org/thread.html/6b414817c2b0bf351138911c8c922ec5dd577ebc0b9a7f42d705752d%40%3Cissues.activemq.apache.org%3E
https://lists.apache.org/thread.html/ac51944aef91dd5006b8510b0bef337adaccfe962fb90e7af9c22db4%40%3Cissues.activemq.apache.org%3E
https://lists.debian.org/debian-security-announce/2017/msg00038.html
https://lists.debian.org/debian-security-announce/2017/msg00039.html
https://security.netapp.com/advisory/ntap-20180731-0002/
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html