Denial of service in Cisco Unified Customer Voice Portal

1) Improper input validation

EUVDB-ID: #VU10694

Risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

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

CPE2.3

• cpe:2.3:a:cisco_systems:cisco_unified_customer_voice_portal:11.5.1:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_unified_customer_voice_portal:11.6:*:*:*:*:*:*:*

External links

https://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.