CVE-2019-9518 Information

Description

Some HTTP/2 implementations are vulnerable to a flood of empty frames potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA HEADERS CONTINUATION and/or PUSH_PROMISE. The peer spends time processing each frame disproportionate to attack bandwidth. This can consume excess CPU.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html http://seclists.org/fulldisclosure/2019/Aug/16 https://access.redhat.com/errata/RHSA-2019:2925 https://access.redhat.com/errata/RHSA-2019:2939 https://access.redhat.com/errata/RHSA-2019:2955 https://access.redhat.com/errata/RHSA-2019:3892 https://access.redhat.com/errata/RHSA-2019:4352 https://access.redhat.com/errata/RHSA-2020:0727 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://lists.apache.org/thread.html/091b518265bce56a16af87b77c8cfacda902a02079e866f9fdf13b61@3Cusers.trafficserver.apache.org3E https://lists.apache.org/thread.html/2653c56545573b528f3f6352a29eccaf498bd6fb2a6a59568d81a61d@3Cannounce.trafficserver.apache.org3E https://lists.apache.org/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe@3Ccommits.druid.apache.org3E https://lists.apache.org/thread.html/ff5b0821a6985159a832ff6d1a4bd311ac07ecc7db1e2d8bab619107@3Cdev.trafficserver.apache.org3E https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/ https://seclists.org/bugtraq/2019/Aug/24 https://seclists.org/bugtraq/2019/Sep/18 https://security.netapp.com/advisory/ntap-20190823-0005/ https://support.f5.com/csp/article/K46011592 https://support.f5.com/csp/article/K46011592?utm_source=f5support&utm_medium=RSS https://www.debian.org/security/2019/dsa-4520 https://www.synology.com/security/advisory/Synology_SA_19_33

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5