An updated unattended-upgrades package has been released for Debian

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Debian Security Advisory DSA-3297-1 security@debian.org
https://www.debian.org/security/ Alessandro Ghedini
June 29, 2015 https://www.debian.org/security/faq
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Package : unattended-upgrades
CVE ID : CVE-2015-1330

It was discovered that unattended-upgrades, a script for automatic
installation of security upgrades, did not properly authenticate
downloaded packages when the force-confold or force-confnew dpkg options
were enabled via the DPkg::Options::* apt configuration.

For the oldstable distribution (wheezy), this problem has been fixed
in version 0.79.5+wheezy2.

For the stable distribution (jessie), this problem has been fixed in
version 0.83.3.2+deb8u1.

For the unstable distribution (sid), this problem will be fixed shortly.

We recommend that you upgrade your unattended-upgrades packages.

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