Vulnerability Name:

CVE-2019-6474 (CCN-166131)

Assigned:2019-08-28
Published:2019-08-28
Updated:2020-08-24
Summary:A missing check on incoming client requests can be exploited to cause a situation where the Kea server's lease storage contains leases which are rejected as invalid when the server tries to load leases from storage on restart. If the number of such leases exceeds a hard-coded limit in the Kea code, a server trying to restart will conclude that there is a problem with its lease store and give up. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
5.7 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
5.0 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:6.1 Medium (CVSS v2 Vector: AV:A/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
5.5 Medium (CCN CVSS v2 Vector: AV:A/AC:L/Au:S/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-772
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2019-6474

Source: XF
Type: UNKNOWN
isc-kea-cve20196474-dos(166131)

Source: CCN
Type: ISC Web site
CVE-2019-6474: An oversight when validating incoming client requests can lead to a situation where the Kea server will exit when trying to restart

Source: CONFIRM
Type: Vendor Advisory
https://kb.isc.org/docs/cve-2019-6474

Source: CCN
Type: oss-sec Mailing List, Wed, 28 Aug 2019 23:46:31 -0800
Three vulnerabilities in Kea DHCP disclosed by ISC, 28 August 2019

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2019-6474

Vulnerable Configuration:Configuration 1:
  • cpe:/a:isc:kea:*:*:*:*:*:*:*:* (Version >= 1.4.0 and <= 1.5.0)
  • OR cpe:/a:isc:kea:1.6.0:beta1:*:*:*:*:*:*
  • OR cpe:/a:isc:kea:1.6.0:beta2:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:isc:kea:1.4.0:*:*:*:*:*:*:*
  • OR cpe:/a:isc:kea:1.5.0:*:*:*:*:*:*:*
  • OR cpe:/a:isc:kea:1.6.0:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.disco:def:201964740000000
    V
    		CVE-2019-6474 on Ubuntu 19.04 (disco) - medium.
    2019-10-16
    oval:com.ubuntu.bionic:def:201964740000000
    V
    		CVE-2019-6474 on Ubuntu 18.04 LTS (bionic) - medium.
    2019-10-16
    oval:com.ubuntu.xenial:def:201964740000000
    V
    		CVE-2019-6474 on Ubuntu 16.04 LTS (xenial) - medium.
    2019-10-16
    BACK
    isc kea *
    isc kea 1.6.0 beta1
    isc kea 1.6.0 beta2
    isc kea 1.4.0
    isc kea 1.5.0
    isc kea 1.6.0 -