USN-4698-1: Dnsmasq vulnerabilities
19 January 2021
Several security issues were fixed in Dnsmasq.
Releases
Packages
- dnsmasq - Small caching DNS proxy and DHCP/TFTP server
Details
Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled
memory when sorting RRsets. A remote attacker could use this issue to cause
Dnsmasq to hang, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2020-25681, CVE-2020-25687)
Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled
extracting certain names. A remote attacker could use this issue to cause
Dnsmasq to hang, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2020-25682, CVE-2020-25683)
Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly
implemented address/port checks. A remote attacker could use this issue to
perform a cache poisoning attack. (CVE-2020-25684)
Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly
implemented query resource name checks. A remote attacker could use this
issue to perform a cache poisoning attack. (CVE-2020-25685)
Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled
multiple query requests for the same resource name. A remote attacker could
use this issue to perform a cache poisoning attack. (CVE-2020-25686)
It was discovered that Dnsmasq incorrectly handled memory during DHCP
response creation. A remote attacker could possibly use this issue to
cause Dnsmasq to consume resources, leading to a denial of service. This
issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04
LTS. (CVE-2019-14834)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04
-
dnsmasq
-
2.75-1ubuntu0.16.04.7
-
dnsmasq-base
-
2.75-1ubuntu0.16.04.7
-
dnsmasq-utils
-
2.75-1ubuntu0.16.04.7
After a standard system update you need to reboot your computer to make
all the necessary changes.