Bug 1302588 - (CVE-2016-0746) CVE-2016-0746 nginx: use-after-free during CNAME response processing in resolver
CVE-2016-0746 nginx: use-after-free during CNAME response processing in resolver
Status: CLOSED ERRATA
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=20160126,repor...
: Security
Depends On: 1302334 1302337 1302592 1302599 1342443
Blocks: 1302591
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Reported: 2016-01-28 03:41 EST by Martin Prpic
Modified: 2016-07-14 07:21 EDT (History)
13 users (show)

See Also:
Fixed In Version: nginx 1.9.10, nginx 1.8.1
Doc Type: Bug Fix
Doc Text:
A use-after-free flaw was found in the way nginx resolved certain CNAME DNS records. An attacker able to manipulate DNS responses received by nginx could use this flaw to cause a worker process to crash or, possibly, execute arbitrary code if nginx enabled the resolver in its configuration.
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Last Closed: 2016-07-14 07:21:20 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Martin Prpic 2016-01-28 03:41:23 EST
The following flaw was found in the nginx resolver:

Use-after-free condition might occur during CNAME response processing. This problem allows an attacker who is able to trigger name resolution to cause worker process crash, or might have potential other impact.

This issue affects nginx only if the "resolver" directive is used in a configuration file.

The problems are fixed in nginx upstream versions 1.9.10 and 1.8.1.

External References:

http://mailman.nginx.org/pipermail/nginx-announce/2016/000169.html
Comment 1 Martin Prpic 2016-01-28 03:45:07 EST
Created nginx tracking bugs for this issue:

Affects: fedora-all [bug 1302592]
Comment 2 Tomas Hoger 2016-02-10 16:49:28 EST
Bug 1302589 comment 3 as few notes on how nginx resolver is used.
Comment 6 errata-xmlrpc 2016-07-14 01:50:24 EDT
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS

Via RHSA-2016:1425 https://access.redhat.com/errata/RHSA-2016:1425

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