HTTP/2 CVE-2019-9517 Remote Denial of Service Vulnerability

Description

HTTP/2 is prone to a remote denial-of-service vulnerability. Attackers can exploit this issue to consume excess memory, denying service to legitimate users.

Technologies Affected

• Apache Apache 2.4.20
• Apache Apache 2.4.23
• Apache Apache 2.4.25
• Apache Apache 2.4.26
• Apache Apache 2.4.27
• Apache Apache 2.4.28
• Apache Apache 2.4.29
• Apache Apache 2.4.32
• Apache Apache 2.4.33
• Apache Apache 2.4.34
• Apache Apache 2.4.35
• Apache Apache 2.4.37
• Apache Apache 2.4.38
• Apache Apache 2.4.39
• McAfee Active Response 1.0
• McAfee Active Response 2.0
• McAfee Advanced Threat Defense 4.0
• McAfee Advanced Threat Defense 4.2.0
• McAfee Advanced Threat Defense 4.4.0
• McAfee Advanced Threat Defense 4.6.0
• McAfee SIEM Enterprise Security Manager 10.2.0
• McAfee SIEM Enterprise Security Manager 10.3.0
• McAfee SIEM Enterprise Security Manager 10.4.0
• McAfee SIEM Enterprise Security Manager 11.0.0
• McAfee SIEM Enterprise Security Manager 11.1.0
• McAfee SIEM Enterprise Security Manager 11.2.0
• McAfee Web Gateway 7.7.0
• McAfee Web Gateway 7.8
• McAfee Web Gateway 8.0
• McAfee Web Gateway 8.1.0
• NetApp Clustered Data ONTAP
• Oracle Enterprise Manager Ops Center 12.3.3
• Oracle Enterprise Manager Ops Center 12.4.0
• RFC 7540 HTTP/2
• Redhat Enterprise Linux 8
• Redhat Enterprise Linux for ARM 64 8
• Redhat Enterprise Linux for IBM z Systems 8
• Redhat Enterprise Linux for Power little endian 8
• Redhat JBoss Fuse 7.0
• Redhat Software Collections 1 for RHEL 7
• Redhat Software Collections 1 for RHEL 7.5
• Redhat Software Collections 1 for RHEL 7.6
• Redhat Software Collections 1 for RHEL 7.7
• Redhat Software Collections for RHEL 6
• Ubuntu Ubuntu Linux 16.04 LTS
• Ubuntu Ubuntu Linux 18.04 LTS
• Ubuntu Ubuntu Linux 19.04

Recommendations

Block external access at the network boundary, unless external parties require service.
If global access isn’t needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of exploits.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This includes unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.

Updates are available. Please see the references or vendor advisory for more information.