The following updates has been released for Debian 6 LTS:

[DLA 270-1] bind9 security update
[DLA 271-1] libunwind security update

[DLA 270-1] bind9 security update

Package : bind9
Version : 9.7.3.dfsg-1~squeeze15
CVE ID : CVE-2015-4620
Debian Bug : 791715

A vulnerability has been found in the Internet Domain Name Server bind9:

CVE-2015-4620

Breno Silveira Soares of Servico Federal de Processamento de Dados (SERPRO)
discovered that the BIND DNS server is prone to a denial of service
vulnerability. A remote attacker who can cause a validating resolver
to query a zone containing specifically constructed contents can
cause the resolver to terminate with an assertion failure, resulting
in a denial of service to clients relying on the resolver.

For the squeeze distribution, these issues have been fixed in version
9.7.3.dfsg-1~squeeze15 of bind9.

We recommend that you upgrade your bind9 packages.

[DLA 271-1] libunwind security update

Package : libunwind
Version : 0.99-0.2+deb6u1
CVE ID : CVE-2015-3239

Invalid dwarf opcodes can cause references beyond the end of the array.