CVE-2019-9514: Some HTTP/2 implementations are vulnerable to a reset flood, potentially leading to a denial of service
A flaw was found in HTTP/2. Using HEADER frames with invalid HTTP headers and queuing of response RSTSTREAM frames, an attacker could cause a flood resulting in unbounded memory growth. The highest threat from this vulnerability is to system availability.
Other sources
HTTP/2 flood using HEADERS frames with invalid HTTP headers and queuing of response RSTSTREAM frames that results in unbounded memory growth.
— Red Hat
Netflix has discovered several resource exhaustion vectors affecting a variety of third-party HTTP/2 implementations. These attack vectors can be used to launch DoS attacks against servers that support HTTP/2 communication. Netflix worked with Google and CERT/CC to coordinate disclosure to the Internet community.
— Node.Js
Some HTTP/2 implementations are vulnerable to a reset flood, potentially leading to a denial of service. Servers that accept direct connections from untrusted clients could be remotely made to allocate an unlimited amount of memory, until the program crashes. The attacker opens a number of streams and sends an invalid request over each stream that should solicit a stream of RSTSTREAM frames from the peer. Depending on how the peer queues the RSTSTREAM frames, this can consume excess memory, CPU, or both.
Specific Go Packages Affected golang.org/x/net/http2
— GitHub
Some HTTP/2 implementations are vulnerable to a reset flood, potentially leading to a denial of service. The attacker opens a number of streams and sends an invalid request over each stream that should solicit a stream of RSTSTREAM frames from the peer. Depending on how the peer queues the RSTSTREAM frames, this can consume excess memory, CPU, or both.
Affected Software
Remediation
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Fixed in 8.16.1 - Upgrade
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alpine/containerdto a version that resolves this vulnerability.Fixed in 1.2.9-r0 - Upgrade
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alpine/goto a version that resolves this vulnerability.Fixed in 1.12.8-r0 - Upgrade
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alpine/h2oto a version that resolves this vulnerability.Fixed in 2.2.6-r0 - Upgrade
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alpine/k3sto a version that resolves this vulnerability.Fixed in 0.8.1-r0 - Upgrade
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alpine/nodejsto a version that resolves this vulnerability.Fixed in 10.16.3-r0 - Upgrade
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alpine/py3-twistedto a version that resolves this vulnerability.Fixed in 19.10.0-r0 - Upgrade
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ubuntu/twistedto a version that resolves this vulnerability.Fixed in 17.9.0-2ubuntu0.1 - Upgrade
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ubuntu/nettyto a version that resolves this vulnerability.Fixed in 1:4.1.7-4ubuntu0.1+esm1 - Upgrade
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ubuntu/twistedto a version that resolves this vulnerability.Fixed in 18.9.0-6ubuntu1
Event History
Parent advisories
This vulnerability appears in the following advisories.
- RHSA-2020:0922
- RHSA-2020:1445
- RHSA-2020:3196
- RHSA-2019:2682
- RHSA-2020:0406
- RHSA-2019:2726
- RHSA-2019:2925
- RHSA-2019:4269
- RHSA-2019:4273
- RHSA-2019:4352
- RHSA-2020:0727
- RHSA-2019:4021
- RHSA-2019:4018
- RHSA-2019:4019
- RHSA-2019:4020
- RHSA-2020:2565
- RHSA-2019:3892
- RHSA-2020:0983
- RHSA-2019:2690
- RHBA-2019:3139
- RHSA-2019:2817
- RHSA-2019:3906
- RHSA-2019:2769
- RHBA-2019:2819
- RHSA-2019:2594
- RHSA-2019:2661
- RHSA-2019:2766
- RHSA-2019:2861
- RHSA-2019:3131
- RHSA-2019:3265
- RHSA-2019:3245
- RHSA-2019:2796
- RHSA-2020:3197
- RHSA-2019:2966
- RHSA-2019:4045
- RHSA-2019:4040
- RHSA-2019:4041
- RHSA-2019:4042
- RHSA-2019:2939
- RHSA-2019:2955
- RHSA-2020:2067
- nodejs-aug-2019-security-releases
- nodejs-release-v10.16.3
- nodejs-release-v12.8.1
- nodejs-release-v8.16.1
Frequently Asked Questions
What is the severity of CVE-2019-9514?
The severity of CVE-2019-9514 is classified as high, primarily affecting system availability through unbounded memory growth.
How do I fix CVE-2019-9514?
To fix CVE-2019-9514, update affected software to the latest versions specified in the remediation section of the vulnerability.
Which software is affected by CVE-2019-9514?
CVE-2019-9514 affects various Red Hat packages including go-toolset, eap7-apache-cxf, containernetworking-plugins, and several versions of the JBoss application server.
What type of attack does CVE-2019-9514 enable?
CVE-2019-9514 enables an attacker to perform a denial-of-service attack by flooding a server with invalid HTTP/2 header frames.
Can CVE-2019-9514 affect both Apache and Go applications?
Yes, CVE-2019-9514 can affect applications using Apache Traffic Server as well as those built with Go language due to mismanagement of HTTP/2.