Resource exhaustion in PowerDNS - CVE-2016-7072

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Main Vulnerability Database Vulnerabilities #VU32139

Resource exhaustion in PowerDNS - CVE-2016-7072

Published: September 10, 2018 / Updated: July 28, 2020


Vulnerability identifier: #VU32139
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-2016-7072
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

An issue has been found in PowerDNS Authoritative Server before 3.4.11 and 4.0.2 allowing a remote, unauthenticated attacker to cause a denial of service by opening a large number of TCP connections to the web server. If the web server runs out of file descriptors, it triggers an exception and terminates the whole PowerDNS process. While it's more complicated for an unauthorized attacker to make the web server run out of file descriptors since its connection will be closed just after being accepted, it might still be possible.


Affected software

PowerDNS
Arch Linux
Fedora
Cisco Secure Access Control
pdns (Alpine package)
pdns
pdns-recursor

How to mitigate CVE-2016-7072

Install update from vendor's website.

PowerDNS - update to 3.4.11
pdns (Alpine package) - update to 4.0.3-r0
pdns - addressed in versions 3.4.11-1.el7, 4.0.3-1.fc24, 4.0.3-1.fc25
pdns-recursor - addressed in versions 3.7.4-1.el6, 3.7.4-1.el7, 4.0.4-1.fc24, 4.0.4-1.fc25

External References

Related Security Bulletins