#VU29184 Reachable Assertion in ISC BIND - CVE-2020-8618

Vulnerability identifier: #VU29184

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-8618

CWE-ID: CWE-617

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 a reachable assertion in rdataset.c when processing large responses during zone transfers. A remote attacker with ability to send zone data to a server via zone transfer can exploit this to intentionally trigger memory corruption and assertion failure with a specially constructed zone, denying service to clients.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ISC BIND: 9.11.0 rc1 - 9.17.1

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External links
https://kb.isc.org/docs/cve-2020-8618

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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