thekelleys dnsmasq CVE-2021-3448 vulnerability in Thekelleys and Other Products
Published on April 8, 2021

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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.

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Vulnerability Analysis

CVE-2021-3448 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
NONE
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
NONE
Integrity Impact:
LOW
Availability Impact:
NONE

Weakness Type

Improperly Implemented Security Check for Standard

The software does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique.


Products Associated with CVE-2021-3448

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2021-3448 are published in these products:

Thekelleys Dnsmasq
 
Red Hat Enterprise Linux (RHEL)
 
Fedora Project Fedora
 
Oracle Communications Cloud Native Core Network Function Cloud Native Environment
 

Exploit Probability

EPSS
0.04%
Percentile
12.52%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.