PT-2018-4974 · Powerdns+1 · Powerdns+3
Florian Heinz
+1
·
Publicado
2017-01-13
·
Atualizado
2024-06-15
·
CVE-2016-7068
CVSS v2.0
7.8
Alta
| Vetor | AV:N/AC:L/Au:N/C:N/I:N/A:C |
Name of the Vulnerable Software and Affected Versions
PowerDNS versions prior to 3.4.11 and 4.0.2
PowerDNS recursor versions prior to 3.7.4 and 4.0.4
Description
The issue allows a remote, unauthenticated attacker to cause an abnormal CPU usage load on the PowerDNS server by sending crafted DNS queries. This could result in a partial denial of service if the system becomes overloaded. The problem is based on the fact that the PowerDNS server parses all records present in a query regardless of whether they are needed or even legitimate. A specially crafted query containing a large number of records can be used to take advantage of that behavior.
Recommendations
For PowerDNS versions prior to 3.4.11 and 4.0.2, update to version 3.4.11 or 4.0.2 or later to resolve the issue.
For PowerDNS recursor versions prior to 3.7.4 and 4.0.4, update to version 3.7.4 or 4.0.4 or later to resolve the issue.
As a temporary workaround, consider restricting access to the PowerDNS server to minimize the risk of exploitation.
Correção
DoS
RCE
Resource Exhaustion
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Identificadores relacionados
Produtos afetados
Alt Linux
Powerdns
Powerdns Recursor
Powerdns Authoritative Server