SB2021081931 - Fedora 34 update for bind, bind-dyndb-ldap
Published: August 19, 2021
Security Bulletin ID
SB2021081931
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Reachable Assertion (CVE-ID: CVE-2021-25218)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion when sending large responses over UDP. If named attempts to respond over UDP
with a response that is larger than the current effective interface
maximum transmission unit (MTU), and if response-rate limiting (RRL) is
active, an assertion failure is triggered. A remote attacker can force named to trigger the assertion failure and perform a denial of service attack.
Remediation
Install update from vendor's website.