It was discovered that Unbound, a recursive DNS resolver, would crash when processing certain malformed DNS responses from authoritative DNS servers, leading to denial of service.

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Debian Security Advisory DSA-2370-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
http://www.debian.org/security/                            Florian Weimer
December 22, 2011                      http://www.debian.org/security/faq
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Package        : unbound
Vulnerability  : several
Problem type   : remote
Debian-specific: no
CVE ID         : CVE-2011-4528 CVE-2011-4869

It was discovered that Unbound, a recursive DNS resolver, would crash
when processing certain malformed DNS responses from authoritative DNS
servers, leading to denial of service.

CVE-2011-4528
	Unbound attempts to free unallocated memory during processing
	of duplicate CNAME records in a signed zone.

CVE-2011-4869
	Unbound does not properly process malformed responses which
	lack expected NSEC3 records.

For the oldstable distribution (lenny), these problems have been fixed in
version 1.4.6-1~lenny2.

For the stable distribution (squeeze), these problems have been fixed in
version 1.4.6-1+squeeze2.

For the testing distribution (wheezy) and the unstable distribution
(sid), these problems have been fixed in version 1.4.14-1.

We recommend that you upgrade your unbound packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

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