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Bug 1633399 - (CVE-2018-11763) CVE-2018-11763 httpd: DoS for HTTP/2 connections by continuous SETTINGS
CVE-2018-11763 httpd: DoS for HTTP/2 connections by continuous SETTINGS
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180925,repor...
: Security
Depends On: 1633401 1635838 1633400
Blocks: 1633402
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Reported: 2018-09-26 17:37 EDT by Pedro Sampaio
Modified: 2018-10-19 19:36 EDT (History)
64 users (show)

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Fixed In Version: httpd 2.4.35, mod_http2 1.11.0
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Description Pedro Sampaio 2018-09-26 17:37:20 EDT 
In 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.

References:

https://httpd.apache.org/security/vulnerabilities_24.html
Comment 1 Pedro Sampaio 2018-09-26 17:38:18 EDT 
Created httpd tracking bugs for this issue:

Affects: fedora-all [bug 1633400]
Comment 3 Tomas Hoger 2018-09-27 05:18:40 EDT 
The httpd packages in Red Hat Enterprise Linux 7 and earlier do not include support for HTTP/2 and hence are not affected by this issue.
Comment 5 Joe Orton 2018-09-27 06:32:48 EDT 
This issue is fixed upstream in httpd in the following commits:

trunk: https://svn.apache.org/r1840010
2.4.x: https://svn.apache.org/r1840757

Which matches the change made downstream in mod_h2 on github:

https://github.com/icing/mod_h2/commit/5e75e5685dd043fe93a5a08a15edd087a43f6968

i.e. this issue is fixed in httpd 2.4.35 and later, and in mod_http2 1.11.0 and later.
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