Vulnerability identifier: #VU14291

Vulnerability risk: Medium

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-2018-5740

CWE-ID: CWE-617

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ISC BIND
Server applications / DNS servers

Vendor: ISC

Description

The vulnerability allows an attacker to perform denial of service (DoS) attack.

The vulnerability exists due to INSIST assertion failure in name.c when processing recursive queries. A remote attacker can trigger denial of service conditions if the affected server is configured with enabled "deny-answer-aliases" feature.

Mitigation

Update to version 9.9.13-P1, 9.10.8-P1, 9.11.3-S3, 9.11.4-P1 or 9.12.2-P1

Vulnerable software versions

ISC BIND: 9.7.0 - 9.13.2

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External links
http://kb.isc.org/article/AA-01639/74/CVE-2018-5740%3A-A-flaw-in-the-deny-answer-aliases-feature-ca...

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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.