ESB-2020.2977 – [Debian] bind9: Denial of service – Remote/unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.2977
                           bind9 security update
                              31 August 2020

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

Product:           bind9
Publisher:         Debian
Operating System:  Debian GNU/Linux 9
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-8623 CVE-2020-8622 

Reference:         ESB-2020.2954
                   ESB-2020.2951
                   ESB-2020.2881
                   ESB-2020.2872

Original Bulletin: 
   https://www.debian.org/lts/security/2020/dla-2355

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Debian LTS Advisory DLA-2355-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                    Thorsten Alteholz
August 29, 2020                               https://wiki.debian.org/LTS
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Package        : bind9
Version        : 1:9.10.3.dfsg.P4-12.3+deb9u7
CVE ID         : CVE-2020-8622 CVE-2020-8623


Two issues have been found in bind9, an Internet Domain Name Server.

CVE-2020-8622

      Crafted responses to TSIG-signed requests could lead to an assertion
      failure, causing the server to exit. This could be done by malicious
      server operators or guessing attackers.

CVE-2020-8623

      An assertions failure, causing the server to exit, can be exploited
      by a query for an RSA signed zone.


For Debian 9 stretch, these problems have been fixed in version
1:9.10.3.dfsg.P4-12.3+deb9u7.

We recommend that you upgrade your bind9 packages.

For the detailed security status of bind9 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/bind9

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

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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