CVE-2019-1840 Cisco Prime Network Registrar Denial of Service Vulnerability
Remote attackers can cause a denial of service by sending malformed DHCPv6 packets if custom extensions are installed to modify packets before sanitization.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-1840?
CVE-2019-1840 is a high-severity denial of service vulnerability in Cisco Prime Network Registrar, published on 18 Apr 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-665
Which versions are affected by CVE-2019-1840?
It affects 1 product.
Products include Cisco Prime Network Registrar.
How do I fix CVE-2019-1840?
No fix has been published for CVE-2019-1840 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-1840 being exploited?
There is no known exploitation of CVE-2019-1840 in the wild and no public exploit code.
Other vulnerabilities in Cisco Prime Network Registrar
- CVE-2020-3272 Cisco Prime Network Registrar DHCP Denial of Service Vulnerability
- CVE-2016-1427 Information disclosure in n/a
- CVE-2015-6296 Hardcoded credentials in n/a
- CVE-2020-3148 Cisco Prime Network Registrar Cross-Site Request Forgery Vulnerability
- CVE-2017-6613 Denial of service in Cisco Prime Network Registrar
Sources
Also known as GHSA-788r-rf8c-vgj3.