Insufficient verification of data authenticity in Dnsmasq - CVE-2021-3448
Published: April 13, 2021
Vulnerability identifier: #VU52065
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-3448
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: GNU
Affected software:
Dnsmasq
Dnsmasq
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a DNS Cache Poisoning attack.
The vulnerability exists due to dnsmasq relies only on transmission ID when processing DNS queries and uses the same port for outgoing requests, when configured to given network interface. A remote attacker can guess the random transmission ID to forge a reply and get it accepted by dnsmasq.As a result, an attacker can perform a DNS Cache Poisoning attack.
How to mitigate CVE-2021-3448
Install updates from vendor's website.