Tuomas Räsänen discovered that unsafe signal handling in nbd-server, the server for the Network Block Device protocol, could allow remote attackers to cause a deadlock in the server process and thus a denial of service.

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Debian Security Advisory DSA-3271-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
http://www.debian.org/security/                        Alessandro Ghedini
May 23, 2015                           http://www.debian.org/security/faq
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Package        : nbd
CVE ID         : CVE-2013-7441 CVE-2015-0847
Debian Bug     : 781547 784657

Tuomas Räsänen discovered that unsafe signal handling in nbd-server, the
server for the Network Block Device protocol, could allow remote
attackers to cause a deadlock in the server process and thus a denial of
service.

Tuomas Räsänen also discovered that the modern-style negotiation was
carried out in the main server process before forking the actual client
handler. This could allow a remote attacker to cause a denial of service
(crash) by querying a non-existent export. This issue only affected the
oldstable distribution (wheezy).

For the oldstable distribution (wheezy), these problems have been fixed
in version 1:3.2-4~deb7u5.

For the stable distribution (jessie), these problems have been fixed in
version 1:3.8-4+deb8u1.

For the testing distribution (stretch), these problems have been fixed
in version 1:3.10-1.

For the unstable distribution (sid), these problems have been fixed in
version 1:3.10-1.

We recommend that you upgrade your nbd 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/

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