Advisories » MGASA-2021-0231

Updated dnsmasq packages fix a security vulnerability

Publication date: 08 Jun 2021
Modification date: 07 Jun 2021
Type: security
Affected Mageia releases : 7 , 8
CVE: CVE-2021-3448

Description

A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier (CVE-2021-3448).
This kind of configuration is the default when network-manager uses dnsmasq.
                

References

• https://bugs.mageia.org/show_bug.cgi?id=29030
• https://bugzilla.redhat.com/show_bug.cgi?id=1939368
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3448

SRPMS

7/core

• dnsmasq-2.85-1.mga7

8/core

• dnsmasq-2.85-1.mga8