nbd: Denial of Service -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.1376
                            nbd security update
                                25 May 2015

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           nbd
Publisher:         Debian
Operating System:  Debian GNU/Linux 7
                   Debian GNU/Linux 8
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-0847 CVE-2013-7441 

Original Bulletin: 
   http://www.debian.org/security/2015/dsa-3271

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Debian. It is recommended that administrators 
         running nbd check for an updated version of the software for their 
         operating system.

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Debian Security Advisory DSA-3271-1                   security@debian.org
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/

Mailing list: debian-security-announce@lists.debian.org
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