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Ubuntu Security Notice USN-2676-1
July 22, 2015

nbd vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 15.04
– Ubuntu 14.10
– Ubuntu 14.04 LTS
– Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in NBD.

Software Description:
– nbd: Network Block Device protocol

Details:

It was discovered that NBD incorrectly handled IP address matching. A
remote attacker could use this issue with an IP address that has a partial
match and bypass access restrictions. This issue only affected
Ubuntu 12.04 LTS. (CVE-2013-6410)

Tuomas Räsänen discovered that NBD incorrectly handled wrong export names
and closed connections during negotiation. A remote attacker could use this
issue to cause NBD to crash, resulting in a denial of service. This issue
only affected Ubuntu 12.04 LTS. (CVE-2013-7441)

Tuomas Räsänen discovered that NBD incorrectly handled signals. A remote
attacker could use this issue to cause NBD to crash, resulting in a denial
of service. (CVE-2015-0847)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 15.04:
nbd-server 1:3.8-4ubuntu0.1

Ubuntu 14.10:
nbd-server 1:3.8-1ubuntu0.1

Ubuntu 14.04 LTS:
nbd-server 1:3.7-1ubuntu0.1

Ubuntu 12.04 LTS:
nbd-server 1:2.9.25-2ubuntu1.1

In general, a standard system update will make all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-2676-1
CVE-2013-6410, CVE-2013-7441, CVE-2015-0847

Package Information:
https://launchpad.net/ubuntu/+source/nbd/1:3.8-4ubuntu0.1
https://launchpad.net/ubuntu/+source/nbd/1:3.8-1ubuntu0.1
https://launchpad.net/ubuntu/+source/nbd/1:3.7-1ubuntu0.1
https://launchpad.net/ubuntu/+source/nbd/1:2.9.25-2ubuntu1.1

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