MGASA-2021-0231 - Updated dnsmasq packages fix a security vulnerability

Publication date: 08 Jun 2021
URL: https://advisories.mageia.org/MGASA-2021-0231.html
Type: security
Affected Mageia releases: 7, 8
CVE: CVE-2021-3448

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

Mageia 2021-0231: dnsmasq security update

A flaw was found in dnsmasq in versions before 2.85

Summary

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

Resolution

MGASA-2021-0231 - Updated dnsmasq packages fix a security vulnerability

SRPMS

- 7/core/dnsmasq-2.85-1.mga7

- 8/core/dnsmasq-2.85-1.mga8

Severity
Publication date: 08 Jun 2021
URL: https://advisories.mageia.org/MGASA-2021-0231.html
Type: security
CVE: CVE-2021-3448

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