Improper input validation in pdns (Alpine package)

Published: 2018-11-09

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2018-14626
CWE-ID	CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	pdns (Alpine package) Operating systems & Components / Operating system package or component
Vendor	Alpine Linux Development Team

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Improper input validation

EUVDB-ID: #VU15961

Risk: Low

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

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

Install update from vendor's website.

Vulnerable software versions

pdns (Alpine package): 4.0.3-r0 - 4.1.3-r0

External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.