CVE-2018-11763

NameCVE-2018-11763
DescriptionIn Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout coming to effect. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 protocol.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)
Debian Bugs909591

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
apache2 (PTS)jessie2.4.10-10+deb8u12fixed
jessie (security)2.4.10-10+deb8u14fixed
stretch (security), stretch2.4.25-3+deb9u7fixed
buster2.4.38-3fixed
bullseye, sid2.4.41-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
apache2source(unstable)2.4.35-1medium909591
apache2sourcejessie(not affected)
apache2sourcestretch2.4.25-3+deb9u6medium

Notes

[jessie] - apache2 <not-affected> (Vulnerable code not present)
HTTP/2 support introduced in 2.4.17
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-11763

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