isc bind CVE-2020-8622 vulnerability in ISC and Other Products
Published on August 21, 2020

A truncated TSIG response can lead to an assertion failure

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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.

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Vulnerability Analysis

CVE-2020-8622 is exploitable with network access, and requires small amount of user privileges. 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:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Products Associated with CVE-2020-8622

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2020-8622 are published in these products:

ISC BIND
 
Fedora Project Fedora
 
Debian Linux
 
Canonical Ubuntu Linux
 
NetApp Steelstore Cloud Integrated Storage
 
OpenSuse Leap
 
Synology Dns Server
 
Oracle Communications Diameter Signaling Router
 

Affected Versions

ISC BIND9:

Exploit Probability

EPSS
2.63%
Percentile
85.49%

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.