Denial of service vulnerabilities in PowerDNS Recursor and Authoritative



Published: 2018-11-19
Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2018-10851
CVE-2018-14626
CVE-2018-14644
CWE-ID CWE-401
CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
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PowerDNS Recursor
Server applications / DNS servers

PowerDNS Authoritative
Server applications / DNS servers

Vendor PowerDNS.COM B.V.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Memory leak

EUVDB-ID: #VU15960

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2018-10851

CWE-ID: CWE-401 - Improper Release of Memory Before Removing Last Reference ('Memory Leak')

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The vulnerability exists due to memory leak when handling malicious input. A remote attacker can insert a specially crafted record in a zone under his control, send a DNS query for that record, trigger memory leak and cause the service to crash.

Mitigation

The vulnerability has been fixed in the versions 4.1.5.

Vulnerable software versions

PowerDNS Recursor: 4.1.0 - 4.1.4, 4.0.0 - 4.0.9

PowerDNS Authoritative: 4.1.0 - 4.1.4, 4.0.0 - 4.0.9


CPE2.3 External links

http://bugzilla.redhat.com/show_bug.cgi?id=1649032

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

2) Improper input validation

EUVDB-ID: #VU15961

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2018-14626

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to DNSSEC validating clients consider the answer to be bogus until it expires from the packet cache. A remote attacker can craft a DNS query, cause an answer without DNSSEC records to be inserted into the packet cache and be returned to clients asking for DNSSEC records, thus hiding the presence of DNSSEC signatures for a specific qname and qtype.

Mitigation

The vulnerability has been fixed in the versions 4.1.5.

Vulnerable software versions

PowerDNS Recursor: 4.1.0 - 4.1.4, 4.0.0 - 4.0.9

PowerDNS Authoritative: 4.1.0 - 4.1.4, 4.0.0 - 4.0.9


CPE2.3 External links

http://bugzilla.redhat.com/show_bug.cgi?id=1649028

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

3) Improper input validation

EUVDB-ID: #VU15962

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2018-14644

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to an error if the parent zone is signed, and all the authoritative servers for that parent zone answer with FORMERR to a query for at least one of the meta-types. A remote attacker can send a DNS query for a meta-type like OPT, lead to a zone being wrongly cached as failing DNSSEC validation and cause subsequent queries from clients to request DNSSEC validation answered with a ServFail.

Mitigation

The vulnerability has been fixed in the versions 4.1.5.

Vulnerable software versions

PowerDNS Recursor: 4.1.0 - 4.1.4, 4.0.0 - 4.0.9


CPE2.3 External links

http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14644

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



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