National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2019-1840 Detail

Current Description

A vulnerability in the DHCPv6 input packet processor of Cisco Prime Network Registrar could allow an unauthenticated, remote attacker to restart the server and cause a denial of service (DoS) condition on the affected system. The vulnerability is due to incomplete user-supplied input validation when a custom extension attempts to change a DHCPv6 packet received by the application. An attacker could exploit this vulnerability by sending malformed DHCPv6 packets to the application. An exploit could allow the attacker to trigger a restart of the service which, if exploited repeatedly, might lead to a DoS condition. This vulnerability can only be exploited if the administrator of the server has previously installed custom extensions that attempt to modify the packet details before the packet has been processed. Note: Although the CVSS score matches a High SIR, this has been lowered to Medium because this condition will only affect an application that has customer-developed extensions that will attempt to modify packet parameters before the packet has been completely sanitized. If packet modification in a custom extension happens after the packet has been sanitized, the application will not be affected by this vulnerability. Software versions prior to 8.3(7) and 9.1(2) are affected.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 7.5 HIGH
Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (V3 legend)
Impact Score: 3.6
Exploitability Score: 3.9


Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 7.8 HIGH
Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:C) (V2 legend)
Impact Subscore: 6.9
Exploitability Subscore: 10.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Complete
Additional Information:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.securityfocus.com/bid/108033 Third Party Advisory VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-pnr-dos Vendor Advisory

Technical Details

Vulnerability Type (View All)

  • Improper Initialization (CWE-665)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:cisco:prime_network_registrar:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
8.3.7
 cpe:2.3:a:cisco:prime_network_registrar:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
9.0
Up to (excluding)
9.1.2


Change History

3 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-1840
NVD Published Date:
04/17/2019
NVD Last Modified:
04/23/2019