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Bug 1401528 - (CVE-2016-8740) CVE-2016-8740 httpd: Incomplete handling of LimitRequestFields directive in mod_http2
CVE-2016-8740 httpd: Incomplete handling of LimitRequestFields directive in m...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
: ---
: ---
Assigned To: Red Hat Product Security
impact=low,public=20161204,reported=2...
: Reopened, Security
Depends On: 1401530 1425463
Blocks: 1401531 1406828 1457678
  Show dependency tree / graph
 
Reported: 2016-12-05 09:06 EST by Adam Mariš
Modified: 2017-06-07 13:59 EDT (History)
35 users (show)

See Also:
Fixed In Version: httpd 2.4.24
Doc Type: If docs needed, set a value
Doc Text:
A vulnerability was found in httpd's handling of the LimitRequestFields directive in mod_http2, affecting servers with HTTP/2 enabled. An attacker could send crafted requests with headers larger than the server's available memory, causing httpd to crash.
Story Points: ---
Clone Of:
Environment:
Last Closed: 2017-04-26 10:06:47 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)
httpd 2.4.23 patch (1.20 KB, patch)
2016-12-05 09:13 EST, Adam Mariš 		no flags Details | Diff
Add an attachment (proposed patch, testcase, etc.)


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
Red Hat Product Errata RHSA-2017:1413 normal SHIPPED_LIVE Important: Red Hat JBoss Core Services Apache HTTP Server 2.4.23 Service Pack 1 for RHEL 7 2017-06-07 17:54:35 EDT
Red Hat Product Errata RHSA-2017:1414 normal SHIPPED_LIVE Important: Red Hat JBoss Core Services Apache HTTP Server 2.4.23 Service Pack 1 for RHEL 6 2017-06-07 17:54:17 EDT
Red Hat Product Errata RHSA-2017:1415 normal SHIPPED_LIVE Important: Red Hat JBoss Core Services Apache HTTP Server 2.4.23 Service Pack 1 2017-06-07 17:43:43 EDT

  None (edit)
Description Adam Mariš 2016-12-05 09:06:56 EST 
The HTTP/2 protocol implementation (mod_http2) had an incomplete handling of the LimitRequestFields directive. This allowed an attacker to inject unlimited request headers into the server, leading to eventual memory exhaustion.

Affects all versions from  2.4.17 to  2.4.23.

Mitigation:

As a temporary workaround - HTTP/2 can be disabled by changing
the configuration by removing h2 and h2c from the Protocols
line(s) in the configuration file. 

The resulting line should read:

		Protocols http/1.1

External References:

https://httpd.apache.org/security/vulnerabilities_24.html
http://seclists.org/bugtraq/2016/Dec/3
Comment 2 Adam Mariš 2016-12-05 09:10:43 EST 
Created httpd tracking bugs for this issue:

Affects: fedora-all [bug 1401530]
Comment 3 Adam Mariš 2016-12-05 09:13 EST 
Created attachment 1228070 [details]
httpd 2.4.23 patch
Comment 4 Doran Moppert 2016-12-15 23:16:01 EST 
This doesn't affect default configurations, the impact is limited to a crash and there is amplification - ie, the attacker needs to send O(total available memory) bytes to cause a crash.
Comment 5 Doran Moppert 2016-12-15 23:17:57 EST 
Statement:

Red Hat Product Security has rated this issue as having Low security
impact. This issue is not currently planned to be addressed in future
updates. For additional information, refer to the Issue Severity
Classification: https://access.redhat.com/security/updates/classification/.
Comment 10 errata-xmlrpc 2017-04-26 06:22:33 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
Comment 11 errata-xmlrpc 2017-06-07 13:44:45 EDT 
This issue has been addressed in the following products:

  Red Hat JBoss Core Services

Via RHSA-2017:1415 https://access.redhat.com/errata/RHSA-2017:1415
Comment 12 errata-xmlrpc 2017-06-07 13:56:26 EDT 
This issue has been addressed in the following products:

  JBoss Core Services on RHEL 6

Via RHSA-2017:1414 https://access.redhat.com/errata/RHSA-2017:1414
Comment 13 errata-xmlrpc 2017-06-07 13:59:10 EDT 
This issue has been addressed in the following products:

  JBoss Core Services on RHEL 7

Via RHSA-2017:1413 https://access.redhat.com/errata/RHSA-2017:1413
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