A vulnerability was found in http/2 where an 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, potentially leading to a denial of service.
Created httpd tracking bugs for this issue: Affects: fedora-all [bug 1741869]
Created mod_http2 tracking bugs for this issue: Affects: fedora-all [bug 1741948] Created nghttp2 tracking bugs for this issue: Affects: fedora-all [bug 1741947]
Created nghttp2 tracking bugs for this issue: Affects: epel-all [bug 1741950]
Created nodejs tracking bugs for this issue: Affects: fedora-all [bug 1741974]
Created nodejs tracking bugs for this issue: Affects: epel-all [bug 1742093]
Created nginx tracking bugs for this issue: Affects: epel-all [bug 1742412] Affects: fedora-all [bug 1742411]
External References: https://kb.cert.org/vuls/id/605641/ https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md https://nodejs.org/en/blog/vulnerability/aug-2019-security-releases/
NodeJS upstream commits: https://github.com/nodejs/node/commit/c152449012 https://github.com/nodejs/node/commit/0ce699c7b1 mod_http2 upstream commit: https://github.com/icing/mod_h2/commit/dd05d49abe0f67512ce9ed5ba422d7711effecfb
Mitigation: The httpd version shipped with Red Hat Enterprise Linux 8 provides HTTP/2 support through mod_http2 package. While mod_http2 package is not updated, users can disable HTTP/2 support as mitigation action by executing the following steps: 1. Stop httpd service: $ systemctl stop httpd 2. Remove http/2 protocol support from configuration files: $ sed -i 's/\(h2\)\|\(h2c\)//g' <httpd_config_file> 3. Validate configuration files to make sure all syntax is valid: $ apachectl configtest 4. Restart httpd service: $ systemctl start httpd
Created undertow tracking bugs for this issue: Affects: fedora-all [bug 1748608]
Statement: The package httpd versions as shipped with Red Hat Enterprise Linux 5, 6 and 7 are not affected by this issue as HTTP/2 support is not provided. This flaw has no available mitigation for nodejs package. It will be updated once the available fixes are released for Red Hat Enterprise Linux and Red Hat Software Collections. The nodejs RPM shipped in OpenShift Container Platform 3.9 and 3.10 is not affected by this flaw as it does not contain the vulnerable code.
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2019:2893 https://access.redhat.com/errata/RHSA-2019:2893
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2019-9517
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2019:2925 https://access.redhat.com/errata/RHSA-2019:2925
This issue has been addressed in the following products: Red Hat Software Collections for Red Hat Enterprise Linux 7 Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS Via RHSA-2019:2939 https://access.redhat.com/errata/RHSA-2019:2939
This issue has been addressed in the following products: JBoss Core Services on RHEL 7 JBoss Core Services on RHEL 6 Via RHSA-2019:2946 https://access.redhat.com/errata/RHSA-2019:2946
This issue has been addressed in the following products: Red Hat JBoss Core Services Via RHSA-2019:2950 https://access.redhat.com/errata/RHSA-2019:2950
This issue has been addressed in the following products: Red Hat Software Collections for Red Hat Enterprise Linux 6 Red Hat Software Collections for Red Hat Enterprise Linux 7 Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS Via RHSA-2019:2949 https://access.redhat.com/errata/RHSA-2019:2949
This issue has been addressed in the following products: Red Hat Software Collections for Red Hat Enterprise Linux 7 Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS Via RHSA-2019:2955 https://access.redhat.com/errata/RHSA-2019:2955
This issue has been addressed in the following products: Red Hat JBoss Core Services Via RHSA-2019:3935 https://access.redhat.com/errata/RHSA-2019:3935
This issue has been addressed in the following products: JBoss Core Services on RHEL 7 Via RHSA-2019:3933 https://access.redhat.com/errata/RHSA-2019:3933
This issue has been addressed in the following products: JBoss Core Services on RHEL 6 Via RHSA-2019:3932 https://access.redhat.com/errata/RHSA-2019:3932
This issue has been addressed in the following products: Red Hat AMQ Via RHSA-2020:0922 https://access.redhat.com/errata/RHSA-2020:0922
This issue has been addressed in the following products: Red Hat Fuse 7.6.0 Via RHSA-2020:0983 https://access.redhat.com/errata/RHSA-2020:0983
This issue has been addressed in the following products: Red Hat AMQ 7.4.3 Via RHSA-2020:1445 https://access.redhat.com/errata/RHSA-2020:1445