SB2021041305 - DNS Cache Poisoning attack in dnsmasq
Published: April 13, 2021
Security Bulletin ID
SB2021041305
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Insufficient verification of data authenticity (CVE-ID: CVE-2021-3448)
The vulnerability allows a remote attacker to perform a DNS Cache Poisoning attack.
The vulnerability exists due to dnsmasq relies only on transmission ID when processing DNS queries and uses the same port for outgoing requests, when configured to given network interface. A remote attacker can guess the random transmission ID to forge a reply and get it accepted by dnsmasq.As a result, an attacker can perform a DNS Cache Poisoning attack.
Remediation
Install update from vendor's website.