CVE-2019-9517

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CVE-2019-9517

Summary:

Details: Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.

References: https://lists.apache.org/thread.html/4610762456644181b267c846423b3a990bd4aaea1886ecc7d51febdb%40%3Cannounce.httpd.apache.org%3E, https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E, https://lists.apache.org/thread.html/d89f999e26dfb1d50f247ead1fe8538014eb412b2dbe5be4b1a9ef50%40%3Cdev.httpd.apache.org%3E, https://lists.apache.org/thread.html/ec97fdfc1a859266e56fef084353a34e0a0b08901b3c1aa317a43c8c%40%3Cdev.httpd.apache.org%3E, https://lists.apache.org/thread.html/r03ee478b3dda3e381fd6189366fa7af97c980d2f602846eef935277d%40%3Ccvs.httpd.apache.org%3E, https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3E, https://lists.apache.org/thread.html/r3c5c3104813c1c5508b55564b66546933079250a46ce50eee90b2e36%40%3Ccvs.httpd.apache.org%3E, https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E, https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E, https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E, https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E, https://lists.apache.org/thread.html/rd2fb621142e7fa187cfe12d7137bf66e7234abcbbcd800074c84a538%40%3Ccvs.httpd.apache.org%3E, https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E, https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BP556LEG3WENHZI5TAQ6ZEBFTJB4E2IS/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHTKU7YQ5EEP2XNSAV4M4VJ7QCBOJMOD/, https://support.f5.com/csp/article/K02591030?utm_source=f5support&amp%3Butm_medium=RSS, http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00004.html, http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html, http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html, http://www.openwall.com/lists/oss-security/2019/08/15/7, https://access.redhat.com/errata/RHSA-2019:2893, https://access.redhat.com/errata/RHSA-2019:2925, https://access.redhat.com/errata/RHSA-2019:2939, https://access.redhat.com/errata/RHSA-2019:2946, https://access.redhat.com/errata/RHSA-2019:2949, https://access.redhat.com/errata/RHSA-2019:2950, https://access.redhat.com/errata/RHSA-2019:2955, https://access.redhat.com/errata/RHSA-2019:3932, https://access.redhat.com/errata/RHSA-2019:3933, https://access.redhat.com/errata/RHSA-2019:3935, https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md, https://kb.cert.org/vuls/id/605641/, https://kc.mcafee.com/corporate/index?page=content&id=SB10296, https://seclists.org/bugtraq/2019/Aug/47, https://security.gentoo.org/glsa/201909-04, https://security.netapp.com/advisory/ntap-20190823-0003/, https://security.netapp.com/advisory/ntap-20190823-0005/, https://security.netapp.com/advisory/ntap-20190905-0003/, https://support.f5.com/csp/article/K02591030, https://usn.ubuntu.com/4113-1/, https://www.debian.org/security/2019/dsa-4509, https://www.oracle.com/security-alerts/cpuapr2020.html, https://www.synology.com/security/advisory/Synology_SA_19_33, https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html