CVE-2019-9512

Published: 13 August 2019

Some HTTP/2 implementations are vulnerable to ping floods, potentially leading to a denial of service. The attacker sends continual pings to an HTTP/2 peer, causing the peer to build an internal queue of responses. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

From the Ubuntu Security Team

It was discovered that Netty incorrectly implements HTTP/2. An attacker could possibly use this issue to cause a denial of service.

Notes

nginx added http2 support in 1.9.5
nginx previously fixed issue for CVE-2018-16844
netty added http2 support in 4.1.0
nghttp2: nghttpd and nghttp are affected, libnghttp2 is not
twisted added http2 support in 16.3
trafficserver enabled http2 support by default in 7.0

Packages built using golang need to be rebuilt once the
vulnerability has been fixed. This CVE entry does not
list packages that need rebuilding outside of the main
repository or the Ubuntu variants with PPA overlays.

Status

Severity score breakdown

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9512
• https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
• https://netty.io/news/2019/08/13/4-1-39-Final.html
• http://blog.kazuhooku.com/2019/08/h2o-version-226-230-beta2-released.html
• https://github.com/netty/netty/pull/9460
• https://labs.twistedmatrix.com/2019/11/twisted-19100-released.html
• https://ubuntu.com/security/notices/USN-4308-1
• https://ubuntu.com/security/notices/USN-4866-1
• NVD
• Launchpad
• Debian

Bugs

• https://github.com/golang/go/issues/33606