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AUSCERT External Security Bulletin Redistribution
ESB-2020.1801
Cisco Prime Network Registrar DHCP Denial of Service Vulnerability
21 May 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Prime Network Registrar
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3272
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cpnr-dhcp-dos-BkEZfhLP
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Cisco Prime Network Registrar DHCP Denial of Service Vulnerability
Priority: High
Advisory ID: cisco-sa-cpnr-dhcp-dos-BkEZfhLP
First Published: 2020 May 20 16:00 GMT
Version 1.0: Final
Workarounds: YesCisco Bug IDs: CSCvs77733
CVE-2020-3272
CWE-20
CVSS Score:
7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the DHCP server of Cisco Prime Network Registrar could
allow an unauthenticated, remote attacker to cause a denial of service
(DoS) condition on an affected device.
The vulnerability is due to insufficient input validation of incoming DHCP
traffic. An attacker could exploit this vulnerability by sending a crafted
DHCP request to an affected device. A successful exploit could allow the
attacker to cause a restart of the DHCP server process, causing a DoS
condition.
Cisco has released software updates that address this vulnerability. There
are workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-cpnr-dhcp-dos-BkEZfhLP
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Prime Network Registrar.
For more information about which Cisco Prime Network Registrar releases are
vulnerable, see the Fixed Software section of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Workarounds
o There is a workaround available for customers who cannot upgrade to a fixed
release. To coordinate implementation of the workaround, contact the Cisco
Technical Assistance Center (TAC) .
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license: https://www.cisco.com/c/en/us/products/
end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page , to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
Cisco Prime Network Registrar Major Release First Fixed Version
Prior to 8.3 Not vulnerable.
8.3 8.3.7.1
9.0 9.1.3
9.1 9.1.3
10.0 10.1.0.1
10.1 10.1.0.1
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during the resolution of a Cisco TAC support
case.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-cpnr-dhcp-dos-BkEZfhLP
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-MAY-20 |
+----------+---------------------------+----------+--------+--------------+
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