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AUSCERT External Security Bulletin Redistribution
ESB-2021.1480
USN-4929-1: Bind vulnerabilities
30 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Bind
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-25216 CVE-2021-25215 CVE-2021-25214
Reference: ESB-2021.1442
ESB-2021.1479
Original Bulletin:
https://ubuntu.com/security/notices/USN-4929-1
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USN-4929-1: Bind vulnerabilities
29 April 2021
Several security issues were fixed in Bind.
Releases
o Ubuntu 21.04
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o bind9 - Internet Domain Name Server
Details
Greg Kuechle discovered that Bind incorrectly handled certain incremental
zone updates. A remote attacker could possibly use this issue to cause Bind
to crash, resulting in a denial of service. ( CVE-2021-25214 )
Siva Kakarla discovered that Bind incorrectly handled certain DNAME
records. A remote attacker could possibly use this issue to cause Bind to
crash, resulting in a denial of service. ( CVE-2021-25215 )
It was discovered that Bind incorrectly handled GSSAPI security policy
negotiation. A remote attacker could use this issue to cause Bind to crash,
resulting in a denial of service, or possibly execute arbitrary code.
( CVE-2021-25216 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o bind9 - 1:9.16.8-1ubuntu3.1
Ubuntu 20.10
o bind9 - 1:9.16.6-3ubuntu1.2
Ubuntu 20.04
o bind9 - 1:9.16.1-0ubuntu2.8
Ubuntu 18.04
o bind9 - 1:9.11.3+dfsg-1ubuntu1.15
Ubuntu 16.04
o bind9 - 1:9.10.3.dfsg.P4-8ubuntu1.19
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-25215
o CVE-2021-25214
o CVE-2021-25216
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