USN-4365-2: Bind vulnerabilities
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Ubuntu Security Notice USN-4365-2
May 20, 2020
bind9 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM
Summary:
Several security issues were fixed in Bind.
Software Description:
- bind9: Internet Domain Name Server
Details:
USN-4365-1 fixed several vulnerabilities in Bind. This update provides
the corresponding update for Ubuntu 12.04 ESM and 14.04 ESM.
Original advisory details:
Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Bind
incorrectly limited certain fetches. A remote attacker could possibly use
this issue to cause Bind to consume resources, leading to a denial of
service, or possibly use Bind to perform a reflection attack.
(CVE-2020-8616)
Tobias Klein discovered that Bind incorrectly handled checking TSIG
validity. A remote attacker could use this issue to cause Bind to crash,
resulting in a denial of service, or possibly perform other attacks.
(CVE-2020-8617)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.04 ESM:
bind9 1:9.9.5.dfsg-3ubuntu0.19+esm2
Ubuntu 12.04 ESM:
bind9 1:9.8.1.dfsg.P1-4ubuntu0.30
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4365-2
https://usn.ubuntu.com/4365-1
CVE-2020-8616, CVE-2020-8617
Updated Bind packages are available for Ubuntu Linux 14.04 ESM and 12.04 ESM.