CVE-2020-8618 A buffer boundary check assertion in rdataset.c can fail incorrectly during zone transfer

What is CVE-2020-8618?

CVE-2020-8618 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 17 Jun 2020. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

An attacker who is permitted to send zone data to a server via zone transfer can exploit this to intentionally trigger the assertion failure with a specially constructed zone, denying service to clients.

Weakness: CWE-617

Which versions are affected by CVE-2020-8618?

It affects 4 products.

Products include Canonical Ubuntu Linux, Isc Bind, Netapp Steelstore Cloud Integrated Storage, Opensuse Leap.

How do I fix CVE-2020-8618?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2020-8618 being exploited?

There is no known exploitation of CVE-2020-8618 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2020-8618, DEBIAN-CVE-2020-8618, GHSA-2c3j-p34f-v2cr, UBUNTU-CVE-2020-8618.