Out-of-bounds read in PowerDNS Authoritative - CVE-2021-36754
Published: July 26, 2021
Vulnerability identifier: #VU55314
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-36754
CWE-ID: CWE-125
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 due to a boundary condition when processing DNS queries. A remote attacker can send a specially crafted query with QTYPE 65535, trigger an out-of-bounds read error and perform a denial of service (DoS) attack.
Affected software
PowerDNS Authoritative
Arch Linux
Fedora
pdns
Arch Linux
Fedora
pdns
How to mitigate CVE-2021-36754
Install updates from vendor's website.
PowerDNS Authoritative - update to 4.5.1
pdns - update to 4.5.1-1.el8
pdns - update to 4.5.1-1.el8