CVE-2020-25684 A flaw was found in dnsmasq before version 2.83
Description
A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| dnsmasq | Versions not published |
References
- bugzilla.redhat.com bugzilla.redhat.com
- www.jsof-tech.com www.jsof-tech.com
- FEDORA-2021-84440e87ba lists.fedoraproject.org
- GLSA-202101-17 security.gentoo.org
- DSA-4844 www.debian.org
- FEDORA-2021-2e4c3d5a9d lists.fedoraproject.org
- [debian-lts-announce] 20210322 [SECURITY] [DLA 2604-1] dnsmasq security update lists.debian.org
- www.arista.com www.arista.com
Timeline
- Published
- Last modified