NULL pointer dereference in ISC BIND - #VU48663
Published: November 26, 2020
Vulnerability identifier: #VU48663
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error. After a Negative Trust Anchor (NTA) is added, BIND performs periodic checks to see if it is still necessary. If BIND encountered a failure while creating a query to perform such a check, it attempted to dereference a NULL pointer, resulting in a crash. A remote user can pass specially crafted data to the application and perform a denial of service (DoS) attack.
Affected software
ISC BIND
Slackware Linux
Slackware Linux
Remediation
Install update from vendor's website.
ISC BIND - addressed in versions 9.11.25, 9.11.25-S1