Arch Linux Security Advisory ASA-202010-6 ========================================= Severity: High Date : 2020-10-18 CVE-ID : CVE-2020-25829 Package : powerdns-recursor Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-1243 Summary ======= The package powerdns-recursor before version 4.3.5-1 is vulnerable to denial of service. Resolution ========== Upgrade to 4.3.5-1. # pacman -Syu "powerdns-recursor>=4.3.5-1" The problem has been fixed upstream in version 4.3.5. Workaround ========== None. Description =========== An issue has been found in PowerDNS Recursor before 4.3.5 where a remote attacker can cause the cached records for a given name to be updated to the ‘Bogus’ DNSSEC validation state, instead of their actual DNSSEC ‘Secure’ state, via a DNS ANY query. This results in a denial of service for installations that always validate (dnssec=validate) and for clients requesting validation when on-demand validation is enabled (dnssec=process). Impact ====== A remote attacker can deny DNSSEC validation by updating the state of cached entries. References ========== https://www.openwall.com/lists/oss-security/2020/10/13/3 https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-202... https://downloads.powerdns.com/patches/2020-07/any-cache-update-4.3.4.diff https://github.com/PowerDNS/pdns/commit/ae33c53e68a32189e0a2fd3df24821d3edce... https://security.archlinux.org/CVE-2020-25829