BIND 9 9.18.018: DNSTLS Assertion Crash
CVE-2023-4236 Published on September 20, 2023

named may terminate unexpectedly under high DNS-over-TLS query load
A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load. This issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2023-4236 is exploitable 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-2023-4236

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-4236 are published in these products:

Canonical Ubuntu Linux
 
ISC BIND
 
Fedora Project Fedora
 
Debian Linux
 

Affected Versions

ISC BIND 9:

Exploit Probability

EPSS
0.18%
Percentile
39.12%

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.