Bug 679496 - (CVE-2011-0414) CVE-2011-0414 bind: named lockup with IXFR or DDNS update and a high query rate
CVE-2011-0414 bind: named lockup with IXFR or DDNS update and a high query rate
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
: Security
Depends On: 679560
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Reported: 2011-02-22 13:09 EST by Vincent Danen
Modified: 2011-07-13 06:06 EDT (History)
3 users (show)

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Doc Type: Bug Fix
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Last Closed: 2011-07-13 06:06:30 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Vincent Danen 2011-02-22 13:09:27 EST
It was reported [1] that when the BIND authoritative name server daemon (named) processed a successful IXFR transfer or a dynamic update, there was a small period of time during which the IXFR/update, along with a query, could cause the server to stop processing all requests.  A higher update and/or query rate would increase the probability of the deadlock occurring.

This flaw only affects BIND 9.7.1 and 9.7.2; upstream has released 9.7.3 to
correct this flaw.  Upstream also documents that using the "-n1" option to
cause named to use only one worker thread would mitigate this problem.

[1] https://www.isc.org/software/bind/advisories/cve-2011-0414
Comment 1 Vincent Danen 2011-02-22 15:46:43 EST
Upstream verified to me that this was introduced in 9.7.1, so bind in RHEL6 is not vulnerable.

The fix is also noted as:

Corrected a defect where a combination of dynamic updates and zone transfers incorrectly locked the in-memory zone database, causing named to  freeze. [RT #22614]

in http://ftp.isc.org/isc/bind9/9.7.3/RELEASE-NOTES-BIND-9.7.3.html

9.7.3 is currently in Fedora 13 and 14 testing repositories.
Comment 2 Vincent Danen 2011-02-22 15:47:33 EST

Not vulnerable. This issue did not affect the versions of bind as shipped with Red Hat Enterprise Linux 4, 5, or 6.

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