Reachable Assertion in Kea - CVE-2019-6473
Published: October 16, 2019 / Updated: August 4, 2020
Vulnerability identifier: #VU33367
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-6473
CWE-ID: CWE-617
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
An invalid hostname option can trigger an assertion failure in the Kea DHCPv4 server process (kea-dhcp4), causing the server process to exit. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2.
Affected software
Kea
kea (Alpine package)
isc-kea (Ubuntu package)
kea
Fedora
Ubuntu
kea (Alpine package)
isc-kea (Ubuntu package)
kea
Fedora
Ubuntu
How to mitigate CVE-2019-6473
Install update from vendor's website.
isc-kea (Ubuntu package) - addressed in versions 1.0.0-1ubuntu0.1~esm1, 1.1.0-1ubuntu0.1~esm1
kea - addressed in versions 1.5.0-9.fc30, 1.6.0-4.el7
kea - addressed in versions 1.5.0-9.fc30, 1.6.0-4.el7