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AUSCERT Security Bulletin
ASB-2010.0170
Internet Systems Consortium (ISC) have released an update to BIND 9.7.1
16 July 2010
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AusCERT Security Bulletin Summary
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Product: BIND 9.7.1-P1
BIND 9.7.1
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2010-0213
Member content until: Sunday, August 15 2010
Comment: Note that 9.7.0-P2 is NOT impacted by this vulnerability.
OVERVIEW
Internet Systems Consortium (ISC) have released an update to BIND 9.7.1.
This update (9.7.1-P2) includes security fixes. [1]
IMPACT
The vulnerability is in the code that handles queries for the "RRSIG"
record type. Under certain conditions the query may cause the server
to enter a loop that keeps sending RRSIG queries to the authoritative
server for the queried name.
According to ISC, this is only triggered when "the server has one or
more trust anchors configured statically and/or via DLV, then if the
answer is not already in cache". [1]
MITIGATION
ISC has released BIND 9.7.1-P2 that corrects this vulnerability. [2]
They have not listed any workarounds, so if you are running BIND
9.7.1 you are encouraged to upgrade. [1]
REFERENCES
[1] RRSIG query handling bug in BIND 9.7.1
http://www.isc.org/software/bind/advisories/cve-2010-0213
[2] BIND 9.7.1-P2
http://www.isc.org/software/bind/971-p2
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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