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Ubuntu Security Notice USN-4924-1

Ubuntu Security Notice USN-4924-1
Posted Apr 23, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4924-1 - It was discovered that Dnsmasq incorrectly handled certain wildcard synthesized NSEC records. A remote attacker could possibly use this issue to prove the non-existence of hostnames that actually exist. It was discovered that Dnsmasq incorrectly handled certain large DNS packets. A remote attacker could possibly use this issue to cause Dnsmasq to crash, resulting in a denial of service. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2017-15107, CVE-2019-14513
SHA-256 | 5d79f87d4be36dea5f66dea9fda219d5d8c0d61f0996c4485a733b8654240079

Ubuntu Security Notice USN-4924-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4924-1
April 22, 2021

dnsmasq vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Dnsmasq.

Software Description:
- dnsmasq: Small caching DNS proxy and DHCP/TFTP server

Details:

It was discovered that Dnsmasq incorrectly handled certain wildcard
synthesized NSEC records. A remote attacker could possibly use this issue
to prove the non-existence of hostnames that actually exist.
(CVE-2017-15107)

It was discovered that Dnsmasq incorrectly handled certain large DNS
packets. A remote attacker could possibly use this issue to cause Dnsmasq
to crash, resulting in a denial of service. (CVE-2019-14513)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 LTS:
dnsmasq 2.75-1ubuntu0.16.04.10
dnsmasq-base 2.75-1ubuntu0.16.04.10
dnsmasq-utils 2.75-1ubuntu0.16.04.10

After a standard system update you need to reboot your computer to make all
the necessary changes.

References:
https://ubuntu.com/security/notices/USN-4924-1
CVE-2017-15107, CVE-2019-14513

Package Information:
https://launchpad.net/ubuntu/+source/dnsmasq/2.75-1ubuntu0.16.04.10

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