Vulnerability identifier: #VU20341

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-6470

CWE-ID: CWE-20

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
DHCP
Server applications / Other server solutions

Vendor: ISC

Description

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

The vulnerability exists due to a double deletion issue of released addresses in the DHCPv6 code. A remote non-authenticated attacker can send specially crafted DHCP message to the affected system and perform denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

DHCP: 4.4.0, 3.0 - 3.0.6, 4.3.0 - 4.3.6-P1, 4.1-esv - 4.1.2, 4.2.0 - 4.2.8, 3.1 - 3.1.3, 4.0 - 4.0.3, 2.0

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External links
http://source.isc.org/cgi-bin/gitweb.cgi?p=dhcp.git;a=commit;h=abacf8ad0d8844685e5cd76645a34ef2b8da...

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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