PowerDNS Security Advisory 2018-02: Buffer overflow in dnsreplay

• CVE: CVE-2018-1046
• Date: May 8th 2018
• Credit: Wei Hao
• Affects: dnsreplay from 4.0.0 up to and including 4.1.1
• Not affected: dnsreplay 3.4.11, 4.1.2
• Severity: High
• Impact: Arbitrary code execution
• Exploit: This problem can be triggered via a crafted PCAP file
• Risk of system compromise: Yes
• Solution: Upgrade to a non-affected version

An issue has been found in the dnsreplay tool provided with PowerDNS Authoritative, where replaying a specially crafted PCAP file can trigger a stack-based buffer overflow, leading to a crash and potentially arbitrary code execution. This buffer overflow only occurs when the –ecs-stamp option of dnsreplay is used. Regardless of this issue, the use of dnsreplay with untrusted PCAP files is not advised. This issue has been assigned CVE-2018-1046 by Red Hat.

PowerDNS Authoritative from 4.0.0 up to and including 4.1.1 is affected.

We would like to thank Wei Hao for finding and subsequently reporting this issue.