Debian Security Advisory
DSA-4994-1 bind9 -- security update
- Date Reported:
- 28 Oct 2021
- Affected Packages:
- Security database references:
- In Mitre's CVE dictionary: CVE-2021-25219.
- More information:
Kishore Kumar Kothapalli discovered that the lame server cache in BIND, a DNS server implementation, can be abused by an attacker to significantly degrade resolver performance, resulting in denial of service (large delays for responses for client queries and DNS timeouts on client hosts).
For the oldstable distribution (buster), this problem has been fixed in version 1:9.11.5.P4+dfsg-5.1+deb10u6.
For the stable distribution (bullseye), this problem has been fixed in version 1:9.16.22-1~deb11u1.
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