Debian Security Advisory DSA-4909-1 bind9

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Debian security advisory DSA-4909-1 bind9.

Several vulnerabilities were discovered in BIND, a DNS server implementation.

Debian security advisory DSA-4909-1 bind9.

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 Debian 10 "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.

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