Debian Security Advisory
DSA-4909-1 bind9 -- security update
- Date Reported:
- 01 May 2021
- Affected Packages:
- Security database references:
- In the Debian bugtracking system: Bug 987741, Bug 987742, Bug 987743.
In Mitre's CVE dictionary: CVE-2021-25214, CVE-2021-25215, CVE-2021-25216.
- More information:
Several vulnerabilities were discovered in BIND, a DNS server implementation.
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 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