漏洞描述
The fix for CVE-2019-0199 was incomplete and did not address HTTP/2 connection window exhaustion on write in Apache Tomcat versions 9.0.0.M1 to 9.0.19 and 8.5.0 to 8.5.40 . By not sending WINDOW_UPDATE messages for the connection window (stream 0) clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.
影响产品
修复建议
建议关注厂商安全公告，及时升级至已修复版本，并结合实际资产暴露情况采取缓解措施。
参考链接
lists.apache.orghttps://lists.apache.org/thread.html/r6ccee4e849bc77df0840c7f853f6bd09d426f6741247da2b7429d5d9%40%3Cdev.tomcat.apache.org%3E↗usn.ubuntu.comhttps://usn.ubuntu.com/4128-1/↗www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2020.html↗lists.apache.orghttps://lists.apache.org/thread.html/r48c1444845fe15a823e1374674bfc297d5008a5453788099ea14caf0%40%3Cdev.tomcat.apache.org%3E↗www.debian.orghttps://www.debian.org/security/2020/dsa-4680↗usn.ubuntu.comhttps://usn.ubuntu.com/4128-2/↗lists.apache.orghttps://lists.apache.org/thread.html/raba0fabaf4d56d4325ab2aca8814f0b30a237ab83d8106b115ee279a%40%3Cdev.tomcat.apache.org%3E↗www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2020.html↗access.redhat.comhttps://access.redhat.com/errata/RHSA-2019:3929↗lists.apache.orghttps://lists.apache.org/thread.html/r3bbb800a816d0a51eccc5a228c58736960a9fffafa581a225834d97d%40%3Cdev.tomcat.apache.org%3E↗access.redhat.comhttps://access.redhat.com/errata/RHSA-2019:3931↗lists.apache.orghttps://lists.apache.org/thread.html/df1a2c1b87c8a6c500ecdbbaf134c7f1491c8d79d98b48c6b9f0fa6a%40%3Cannounce.tomcat.apache.org%3E↗www.oracle.comhttps://www.oracle.com/security-alerts/cpuApr2021.html↗www.securityfocus.comhttp://www.securityfocus.com/bid/108874↗security.netapp.comhttps://security.netapp.com/advisory/ntap-20190625-0002/↗www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2020.html↗www.synology.comhttps://www.synology.com/security/advisory/Synology_SA_19_29↗lists.opensuse.orghttp://lists.opensuse.org/opensuse-security-announce/2020-01/msg00013.html↗www.oracle.comhttps://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html↗support.f5.comhttps://support.f5.com/csp/article/K17321505↗