Debian Security Advisory

DLA-2227-1 bind9 -- LTS security update

Date Reported:
30 May 2020
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2020-8616, CVE-2020-8617.
More information:

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

  • CVE-2020-8616

    It was discovered that BIND does not sufficiently limit the number of fetches performed when processing referrals. An attacker can take advantage of this flaw to cause a denial of service (performance degradation) or use the recursing server in a reflection attack with a high amplification factor.

  • CVE-2020-8617

    It was discovered that a logic error in the code which checks TSIG validity can be used to trigger an assertion failure, resulting in denial of service.

    For Debian 8 Jessie, these problems have been fixed in version 1:9.9.5.dfsg-9+deb8u19.

    We recommend that you upgrade your bind9 packages.

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