Bug 1578593 – CVE-2018-5737 bind: Interaction between NSEC aggresive negative caching and the serve-stale feature can cause a denial of service

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Bug 1578593 - (CVE-2018-5737) CVE-2018-5737 bind: Interaction between NSEC aggresive negative caching and the serve-stale feature can cause a denial of service

Summary:	CVE-2018-5737 bind: Interaction between NSEC aggresive negative caching and t...

Status:	CLOSED NOTABUG

Aliases:	CVE-2018-5737

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20180518,repor...
Keywords:	Security

Depends On:	1578904
Blocks:	1578592
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Reported:	2018-05-15 20:01 EDT by Sam Fowler
Modified:	2018-05-23 20:07 EDT (History)
CC List:	16 users (show)

See Also:
Fixed In Version:	bind 9.12.1-P2
Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the "serve-stale" feature as implemented in bind. Problematic interaction between serve-stale feature and NSEC aggressive negative caching could cause denial of service.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2018-05-17 00:02:18 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Description Sam Fowler 2018-05-15 20:01:43 EDT

BIND versions 9.12.0 and 9.12.1 are vulnerable to problematic interaction between the serve-stale feature and NSEC aggressive negative caching can in some cases cause undesirable behavior from named, such as a recursion loop or an assertion failure resulting in termination of the named process.

Deliberate exploitation of this condition could cause operational problems depending on the particular manifestation -- either degradation or denial of service.

Comment 2 Huzaifa S. Sidhpurwala 2018-05-17 00:01:02 EDT

Statement:

This security flaw only affects bind versions 9.12.0 and 9.12.1. Since Red Hat Enterprise Linux does not ship any of these bind versions, it is not affected.

Comment 3 Sam Fowler 2018-05-20 19:48:13 EDT

External Reference:

https://kb.isc.org/article/AA-01606/74/CVE-2018-5737


Upstream Patch:

https://ftp.isc.org/isc/bind9/9.12.1-P2/patches/cve5737.patch

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