CVE-2021-3448
Published: August 31, 2023Last modified: August 31, 2023
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. The highest threat from this vulnerability is to data integrity.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 4 |
| Attack Vector | NETWORK |
| Attack complexity | HIGH |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | CHANGED |
| Confidentiality | NONE |
| Integrity impact | LOW |
| Availability impact | NONE |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | dnsmasq | Not affected (2.87-r2) |
| Stream | dnsmasq | Not affected (2.89-r6) |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1939368
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVTJUOFFFHINLKWAOC2ZSC5MOPD4SJ24/
- 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/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/CVTJUOFFFHINLKWAOC2ZSC5MOPD4SJ24/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/FHG7GWSQWKF7JXIMLOGJBKZWBB4VIAJ7/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/
- https://security.gentoo.org/glsa/202105-20
- https://www.oracle.com/security-alerts/cpujan2022.html