#VU7091 Improper input validation in ISC BIND - CVE-2017-3140

Vulnerability identifier: #VU7091

Vulnerability risk: Medium

CVSSv4.0: 6.6 [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/E:U/U:Green]

CVE-ID: CVE-2017-3140

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ISC BIND
Server applications / DNS servers

Vendor: ISC

Description

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

The vulnerability exists due to an error when processing Response Policy Zones (RPZ) rules, when NSDNAME or NSIP policy rules are used. A remote attacker can trigger the affected server to enter an endless loop and repeatedly query a set of authoritative nameservers.

Successful exploitation of the vulnerability may allow an attacker to perform a denial of service attack.

Mitigation
Update to version 9.9.10-P1, 9.10.5-P1 or 9.11.1-P1.

Vulnerable software versions

ISC BIND: 9.9.10-S1 - 9.11.1

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External links
https://kb.isc.org/article/AA-01495/74/CVE-2017-3140%3A-An-error-processing-RPZ-rules-can-cause-name...

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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.