CVE-2021-3448 — Improperly Implemented Security Check for Standard in Dnsmasq
Severity
4.0MEDIUMNVD
EPSS
0.0%
top 87.49%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedApr 8
Latest updateSep 7
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:NExploitability: 2.2 | Impact: 1.4
Affected Packages4 packages
Also affects: Fedora 32, 33, 34, Enterprise Linux 8.0
Patches
🔴Vulnerability Details
3📋Vendor Advisories
6Microsoft▶
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 netwo↗2021-04-13