Bug 1336350 (CVE-2016-1546) - CVE-2016-1546 httpd: mod_http2 denial-of-service by thread starvation
Summary: CVE-2016-1546 httpd: mod_http2 denial-of-service by thread starvation
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-1546
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1336351 1425470
Blocks: 1336352
TreeView+ depends on / blocked
 
Reported: 2016-05-16 08:54 UTC by Andrej Nemec
Modified: 2021-02-17 03:52 UTC (History)
45 users (show)

Fixed In Version: httpd 2.4.20
Doc Type: Bug Fix
Doc Text:
A denial of service flaw was found in httpd's mod_http2 module. A remote attacker could use this flaw to block server threads for long times, causing starvation of worker threads, by manipulating the flow control windows on streams.
Clone Of:
Environment:
Last Closed: 2019-06-08 02:51:54 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1161 0 normal SHIPPED_LIVE Moderate: httpd24-httpd security, bug fix, and enhancement update 2017-04-26 14:19:21 UTC

Description Andrej Nemec 2016-05-16 08:54:19 UTC 
A vulnerability was found in httpd. By manipulating the flow control windows on streams, a client was able to block server threads for long times, causing starvation of worker threads. Connections could still be opened, but no streams where processed for these. This issue affected HTTP/2 support in 2.4.17 and 2.4.18.

External references:

http://httpd.apache.org/security/vulnerabilities_24.html
Comment 1 Andrej Nemec 2016-05-16 08:54:46 UTC 
Created httpd tracking bugs for this issue:

Affects: fedora-all [bug 1336351]
Comment 2 Tomas Hoger 2016-05-16 11:39:22 UTC 
Upstream commit:

http://svn.apache.org/viewvc?view=revision&revision=1733727

Backported to 2.4.x branch via:

http://svn.apache.org/viewvc?view=revision&revision=1734413

Included in 2.4.19, which was not released.
Comment 5 errata-xmlrpc 2017-04-26 10:22:06 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS

Via RHSA-2017:1161 https://access.redhat.com/errata/RHSA-2017:1161
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