Arch Linux Security Advisory ASA-201504-27 ========================================== Severity: Low Date : 2015-04-24 CVE-ID : CVE-2015-1868 Package : powerdns-recursor Type : denial of service Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE Summary ======= The package powerdns-recursor before version 3.7.2-1 is vulnerable to denial of service. Resolution ========== Upgrade to 3.7.2-1. # pacman -Syu "powerdns-recursor>=3.7.2-1" The problem has been fixed upstream in version 3.7.2. Workaround ========== Exposure can be limited by configuring the allow-from setting so only trusted users can query your nameserver. Description =========== A bug was discovered in our label decompression code, making it possible for names to refer to themselves, thus causing a loop during decompression. This loop is capped at a 1000 iterations by a failsafe, making the issue harmless on most platforms. However, on specific platforms, the recursion involved in these 1000 steps causes memory corruption leading to a quick crash, presumably because the default stack is too small. Impact ====== A remote attacker is able to send queries for specifically configured domains to trigger a flaw that may possibly lead to denial of service. References ========== https://doc.powerdns.com/md/security/powerdns-advisory-2015-01/ https://access.redhat.com/security/cve/CVE-2015-1868 https://bugs.archlinux.org/task/44708