Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2021.1494
bind9 security update
3 May 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: bind9
Publisher: Debian
Operating System: Debian GNU/Linux
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-25216 CVE-2021-25215 CVE-2021-25214
Reference: ESB-2021.1480
ESB-2021.1479
ESB-2021.1442
Original Bulletin:
http://www.debian.org/security/2021/dsa-4909
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Debian Security Advisory DSA-4909-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
May 01, 2021 https://www.debian.org/security/faq
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Package : bind9
CVE ID : CVE-2021-25214 CVE-2021-25215 CVE-2021-25216
Debian Bug : 987741 987742 987743
Several vulnerabilities were discovered in BIND, a DNS server
implementation.
CVE-2021-25214
Greg Kuechle discovered that a malformed incoming IXFR transfer
could trigger an assertion failure in named, resulting in denial
of service.
CVE-2021-25215
Siva Kakarla discovered that named could crash when a DNAME record
placed in the ANSWER section during DNAME chasing turned out to be
the final answer to a client query.
CVE-2021-25216
It was discovered that the SPNEGO implementation used by BIND is
prone to a buffer overflow vulnerability. This update switches to
use the SPNEGO implementation from the Kerberos libraries.
For the stable distribution (buster), these problems have been fixed in
version 1:9.11.5.P4+dfsg-5.1+deb10u5.
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 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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===========================================================================
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