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AUSCERT External Security Bulletin Redistribution
ESB-2021.1383
USN-4924-1: Dnsmasq vulnerabilities
23 April 2021
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AusCERT Security Bulletin Summary
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Product: Dnsmasq
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-14513 CVE-2017-15107
Reference: ESB-2019.4570
ESB-2019.3767
ESB-2019.3504
ESB-2019.2421
Original Bulletin:
https://ubuntu.com/security/notices/USN-4924-1
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USN-4924-1: Dnsmasq vulnerabilities
22 April 2021
Several security issues were fixed in Dnsmasq.
Releases
o Ubuntu 16.04 LTS
Packages
o 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
o dnsmasq - 2.75-1ubuntu0.16.04.10
o dnsmasq-utils - 2.75-1ubuntu0.16.04.10
o dnsmasq-base - 2.75-1ubuntu0.16.04.10
After a standard system update you need to reboot your computer to make all
the necessary changes.
References
o CVE-2019-14513
o CVE-2017-15107
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