SB2019011622 - Input validation error in ISC kea

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Main Vulnerability Database SB2019011622

SB2019011622 - Input validation error in ISC kea

Published: January 16, 2019 Updated: August 8, 2020

Security Bulletin ID SB2019011622
Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Input validation error (CVE-ID: CVE-2018-5739)

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

An extension to hooks capabilities which debuted in Kea 1.4.0 introduced a memory leak for operators who are using certain hooks library facilities. In order to support multiple requests simultaneously, Kea 1.4 added a callout handle store but unfortunately the initial implementation of this store does not properly free memory in every case. Hooks which make use of query4 or query6 parameters in their callouts can leak memory, resulting in the eventual exhaustion of available memory and subsequent failure of the server process. Affects Kea DHCP 1.4.0.


Remediation

Install update from vendor's website.

References