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Vulnerability · Published Aug 21, 2020 · Assigned by isc

CVE-2020-8622A truncated TSIG response can lead to an assertion failure

Medium 6.5

In plain English

A medium-severity security flaw in BIND9 from ISC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 5.9% (higher than 93% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)5.9%top 6.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20bind9.16.6-r0ALPINE-CVE-2020-8622
Alpine:v3.21bind9.16.6-r0ALPINE-CVE-2020-8622
Alpine:v3.22bind9.16.6-r0ALPINE-CVE-2020-8622
Alpine:v3.23bind9.16.6-r0ALPINE-CVE-2020-8622
Alpine:v3.24bind9.16.6-r0ALPINE-CVE-2020-8622
Debian:12bind91:9.16.6-1DEBIAN-CVE-2020-8622
Debian:13bind91:9.16.6-1DEBIAN-CVE-2020-8622
Debian:14bind91:9.16.6-1DEBIAN-CVE-2020-8622

Affected products (as reported)

VendorProductVersions
ISC BIND9 9.0.0 – before unspecifiedunspecified – before 9.11.229.12.0 – before unspecifiedunspecified – before 9.16.69.17.0 – before unspecifiedunspecified – before 9.17.49.9.3-S1 – before Supported Preview*

References