Linux Security
Linux Security
Linux Security

Debian LTS: DLA-2647-1: bind9 security update

Date 04 May 2021
Posted By LinuxSecurity Advisories
Several vulnerabilities were discovered in BIND, a DNS server implementation. CVE-2021-25214

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Debian LTS Advisory DLA-2647-1                This email address is being protected from spambots. You need JavaScript enabled to view it.               Emilio Pozuelo Monfort
May 04, 2021                        
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Package        : bind9
Version        : 1:9.10.3.dfsg.P4-12.3+deb9u9
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


    Greg Kuechle discovered that a malformed incoming IXFR transfer
    could trigger an assertion failure in named, resulting in denial
    of service.


    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.


    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 Debian 9 stretch, these problems have been fixed in version

We recommend that you upgrade your bind9 packages.

For the detailed security status of bind9 please refer to
its security tracker page at:

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

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