Insufficient verification of data authenticity in PowerDNS Recursor - CVE-2023-26437
Published: March 29, 2023
Vulnerability identifier: #VU74176
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-26437
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists in the code responsible for protection against spoofing attacks. A remote attacker can send specially crafted DNS queries with spoofed IP address to force the PowerDNS Recursor to mark specific authoritative servers as not available, leading to a denial of service condition.
Affected software
PowerDNS Recursor
Fedora
pdns-recursor
Fedora
pdns-recursor
How to mitigate CVE-2023-26437
Install updates from vendor's website.
PowerDNS Recursor - addressed in versions 4.6.6, 4.7.5, 4.8.4
pdns-recursor - addressed in versions 4.8.4-1.el8, 4.8.4-1.el9, 4.8.4-1.fc37, 4.8.4-1.fc38
pdns-recursor - addressed in versions 4.8.4-1.el8, 4.8.4-1.el9, 4.8.4-1.fc37, 4.8.4-1.fc38