Denial of service in Cisco Unified Customer Voice Portal

1) Improper input validation

EUVDB-ID: #VU10694

Risk: Low

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0139

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the Interactive Voice Response (IVR) management connection interface due to improper handling of a TCP connection request when the IVR connection is already established. A remote attacker can initiate a specially crafted connection to the IP address, disconnect the IVR to CVP connection and prevent the CVP from accepting new, incoming calls while the IVR automatically attempts to re-establish the connection to the CVP.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Cisco Unified Customer Voice Portal: 11.5.1 - 11.6

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180221-cvp

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.