isc bind CVE-2020-8621 vulnerability in ISC and Other Products
Published on August 21, 2020

Attempting QNAME minimization after forwarding can lead to an assertion failure in resolver.c

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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.

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Vulnerability Analysis

CVE-2020-8621 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Products Associated with CVE-2020-8621

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2020-8621 are published in these products:

ISC BIND
 
OpenSuse Leap
 
Canonical Ubuntu Linux
 
Synology Dns Server
 
NetApp Steelstore Cloud Integrated Storage
 

Affected Versions

ISC BIND9:

Exploit Probability

EPSS
4.88%
Percentile
89.45%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.