Remote DoS in ISC BIND

1) NULL pointer dereference

EUVDB-ID: #VU5674

Risk: Low

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-3135

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to NULL pointer dereference error when parsing DNS queries, if ISC BIND is configured with Response Policy Zones (RPZ) and DNS64 to rewrite query responses. A remote unauthenticated attacker can send specially crafted DNS queries, trigger NULL pointer dereference and cause denial of service.

Successful exploitation of the vulnerability will result in DoS attack against affected daemon.

Mitigation

Install the following versions to resolve this issue:

• BIND 9 version 9.9.9-P6
• BIND 9 version 9.10.4-P6
• BIND 9 version 9.11.0-P3
• BIND 9 version 9.9.9-S8

Vulnerable software versions

ISC BIND: 9.8.8 - 9.11.0b1

External links

http://kb.isc.org/article/AA-01453

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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