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AUSCERT Security Bulletin
ASB-2011.0121
Multiple vulnerabilities have been found in the Unbound DNS server.
21 December 2011
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AusCERT Security Bulletin Summary
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Product: Unbound 1.4.13
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2011-4869 CVE-2011-4528
Member content until: Friday, January 20 2012
OVERVIEW
Multiple vulnerabilities have been found in the Unbound DNS server.
These can lead to remote denial of service or daemon crash. [1]
IMPACT
Unbound versions priror to 1.4.13p2 are vulnerable to a darmon crash
caused by malformed NSEC3 signed zones. Upon validating the response
the daemoon will crash. [1]
Versions priror to 1.4.13p2 are also vulnerable to a but which will
crash due to an attempt to free unallocated memory under certan
conditions. [2]
MITIGATION
Both these issues have been fixed in the most recent verion of the
Unbound software. Users of prevous versions of the software are
recomended to upgrade to the more recent 1.4.14 version which is not
vulnerable to this issue. [3]
REFERENCES
[1] Description and conformation of vulnerability.
http://www.unbound.net/downloads/CVE-2011-4528.txt
[2] CVE-2011-4528
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2011-4528
[3] Unbound 1.4.14 download.
http://unbound.nlnetlabs.nl/downloads/unbound-1.4.14.tar.gz
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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