#VU52065 Insufficient verification of data authenticity in Dnsmasq


Published: 2021-04-13

Vulnerability identifier: #VU52065

Vulnerability risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-3448

CWE-ID: CWE-345

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Dnsmasq
Server applications / DNS servers

Vendor: GNU

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Dnsmasq: 2.0 - 2.84


CPE

External links
http://bugzilla.redhat.com/show_bug.cgi?id=1939368


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?


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