Vulnerability · Published Aug 21, 2020 · Assigned by isc
CVE-2020-8621Attempting QNAME minimization after forwarding can lead to an assertion failure in resolver.c
High 7.5
In plain English
A high-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 3.1% (higher than 88% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)3.1%top 12.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
In BIND 9.14.0 -> 9.16.5, 9.17.0 -> 9.17.3, If a server is configured with both QNAME minimization and 'forward first' then an attacker who can send queries to it may be able to trigger the condition that will cause the server to crash. Servers that 'forward only' are not affected.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | bind | 9.16.6-r0 | ALPINE-CVE-2020-8621 |
| Alpine:v3.21 | bind | 9.16.6-r0 | ALPINE-CVE-2020-8621 |
| Alpine:v3.22 | bind | 9.16.6-r0 | ALPINE-CVE-2020-8621 |
| Alpine:v3.23 | bind | 9.16.6-r0 | ALPINE-CVE-2020-8621 |
| Alpine:v3.24 | bind | 9.16.6-r0 | ALPINE-CVE-2020-8621 |
| Debian:12 | bind9 | 1:9.16.6-1 | DEBIAN-CVE-2020-8621 |
| Debian:13 | bind9 | 1:9.16.6-1 | DEBIAN-CVE-2020-8621 |
| Debian:14 | bind9 | 1:9.16.6-1 | DEBIAN-CVE-2020-8621 |
Affected products (as reported)
References
- https://kb.isc.org/docs/cve-2020-8621 x_refsource_CONFIRM
- https://security.netapp.com/advisory/ntap-20200827-0003/ x_refsource_CONFIRM
- USN-4468-1 vendor-advisory, x_refsource_UBUNTU
- GLSA-202008-19 vendor-advisory, x_refsource_GENTOO
- https://www.synology.com/security/advisory/Synology_SA_20_19 x_refsource_CONFIRM
- openSUSE-SU-2020:1699 vendor-advisory, x_refsource_SUSE
- openSUSE-SU-2020:1701 vendor-advisory, x_refsource_SUSE