CVE-2021-3448
First published: Tue Mar 16 2021(Updated: )
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. The highest threat from this vulnerability is to data integrity.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Thekelleys Dnsmasq | <2.85 | |
| Redhat Enterprise Linux | =8.0 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| Oracle Communications Cloud Native Core Network Function Cloud Native Environment | =1.9.0 | |
| redhat/dnsmasq | <2.85 | 2.85 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1939368
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CVTJUOFFFHINLKWAOC2ZSC5MOPD4SJ24/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FHG7GWSQWKF7JXIMLOGJBKZWBB4VIAJ7/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/
- https://security.gentoo.org/glsa/202105-20
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FHG7GWSQWKF7JXIMLOGJBKZWBB4VIAJ7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVTJUOFFFHINLKWAOC2ZSC5MOPD4SJ24/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1939965
- https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=74d4fcd756a85bc1823232ea74334f7ccfb9d5d2
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2021q2/014962.html
- https://access.redhat.com/errata/RHSA-2021:4153
- https://access.redhat.com/security/cve/cve-2021-3448
Frequently Asked Questions
What is the vulnerability ID of this flaw?
The vulnerability ID of this flaw is CVE-2021-3448.
What is the severity level of CVE-2021-3448?
CVE-2021-3448 has a severity level of medium.
Which software versions are affected by CVE-2021-3448?
Dnsmasq versions before 2.85, Redhat Enterprise Linux 8.0, Fedora 32, Fedora 33, Fedora 34, and Oracle Communications Cloud Native Core Network Function Cloud Native Environment 1.9.0 are affected by CVE-2021-3448.
What is the description of CVE-2021-3448?
CVE-2021-3448 is a flaw in dnsmasq that allows an attacker on the network to guess the random transmission ID by finding the outgoing port used by dnsmasq.
How can this vulnerability be fixed?
To fix CVE-2021-3448, users should update dnsmasq to version 2.85 or later.
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