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Bug 1336350 - (CVE-2016-1546) CVE-2016-1546 httpd: mod_http2 denial-of-service by thread starvation
CVE-2016-1546 httpd: mod_http2 denial-of-service by thread starvation
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
: ---
: ---
Assigned To: Red Hat Product Security
impact=moderate,public=20160411,repor...
: Reopened, Security
Depends On: 1336351 1425470
Blocks: 1336352
  Show dependency tree / graph
 
Reported: 2016-05-16 04:54 EDT by Andrej Nemec
Modified: 2018-06-29 18:08 EDT (History)
46 users (show)

See Also:
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.
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Clone Of:
Environment:
Last Closed: 2016-05-31 04:43:58 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1161 normal SHIPPED_LIVE Moderate: httpd24-httpd security, bug fix, and enhancement update 2017-04-26 10:19:21 EDT

  None (edit)
Description Andrej Nemec 2016-05-16 04:54:19 EDT 
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 04:54:46 EDT 
Created httpd tracking bugs for this issue:

Affects: fedora-all [bug 1336351]
Comment 2 Tomas Hoger 2016-05-16 07:39:22 EDT 
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 06:22:06 EDT 
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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