CVE ID:	CVE-2019-9515
Description:	Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a denial of service. The attacker sends a stream of SETTINGS frames to the peer. Since the RFC requires that the peer reply with one acknowledgement per SETTINGS frame, an empty SETTINGS frame is almost equivalent in behavior to a ping. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2019-9515 Bugtraq: 20190814 APPLE-SA-2019-08-13-5 SwiftNIO HTTP/2 1.5.0 (Google Search) https://seclists.org/bugtraq/2019/Aug/24 Bugtraq: 20190825 [SECURITY] [DSA 4508-1] h2o security update (Google Search) https://seclists.org/bugtraq/2019/Aug/43 Bugtraq: 20190910 [SECURITY] [DSA 4520-1] trafficserver security update (Google Search) https://seclists.org/bugtraq/2019/Sep/18 CERT/CC vulnerability note: VU#605641 https://kb.cert.org/vuls/id/605641/ Debian Security Information: DSA-4508 (Google Search) https://www.debian.org/security/2019/dsa-4508 Debian Security Information: DSA-4520 (Google Search) https://www.debian.org/security/2019/dsa-4520 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/ http://seclists.org/fulldisclosure/2019/Aug/16 https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md https://lists.apache.org/thread.html/ad3d01e767199c1aed8033bb6b3f5bf98c011c7c536f07a5d34b3c19@%3Cannounce.trafficserver.apache.org%3E https://lists.apache.org/thread.html/bde52309316ae798186d783a5e29f4ad1527f61c9219a289d0eee0a7@%3Cdev.trafficserver.apache.org%3E https://lists.apache.org/thread.html/392108390cef48af647a2e47b7fd5380e050e35ae8d1aa2030254c04@%3Cusers.trafficserver.apache.org%3E RedHat Security Advisories: RHSA-2019:2766 https://access.redhat.com/errata/RHSA-2019:2766 RedHat Security Advisories: RHSA-2019:2796 https://access.redhat.com/errata/RHSA-2019:2796 RedHat Security Advisories: RHSA-2019:2861 https://access.redhat.com/errata/RHSA-2019:2861 RedHat Security Advisories: RHSA-2019:2925 https://access.redhat.com/errata/RHSA-2019:2925 RedHat Security Advisories: RHSA-2019:2939 https://access.redhat.com/errata/RHSA-2019:2939 RedHat Security Advisories: RHSA-2019:2955 https://access.redhat.com/errata/RHSA-2019:2955 RedHat Security Advisories: RHSA-2019:3892 https://access.redhat.com/errata/RHSA-2019:3892 RedHat Security Advisories: RHSA-2019:4018 https://access.redhat.com/errata/RHSA-2019:4018 RedHat Security Advisories: RHSA-2019:4019 https://access.redhat.com/errata/RHSA-2019:4019 RedHat Security Advisories: RHSA-2019:4020 https://access.redhat.com/errata/RHSA-2019:4020 RedHat Security Advisories: RHSA-2019:4021 https://access.redhat.com/errata/RHSA-2019:4021 RedHat Security Advisories: RHSA-2019:4040 https://access.redhat.com/errata/RHSA-2019:4040 RedHat Security Advisories: RHSA-2019:4041 https://access.redhat.com/errata/RHSA-2019:4041 RedHat Security Advisories: RHSA-2019:4042 https://access.redhat.com/errata/RHSA-2019:4042 RedHat Security Advisories: RHSA-2019:4045 https://access.redhat.com/errata/RHSA-2019:4045 RedHat Security Advisories: RHSA-2019:4352 https://access.redhat.com/errata/RHSA-2019:4352 RedHat Security Advisories: RHSA-2020:0727 https://access.redhat.com/errata/RHSA-2020:0727 SuSE Security Announcement: openSUSE-SU-2019:2114 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html SuSE Security Announcement: openSUSE-SU-2019:2115 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html https://usn.ubuntu.com/4308-1/