Vulnerability identifier: #VU15218

Vulnerability risk: Low

CVSSv3.1: 3.6 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-15396

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Unity Connection
Client/Desktop applications / Messaging software

Vendor: Cisco Systems, Inc

Description

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

The vulnerability exists due to improper restriction of the maximum size of certain files that can be written to disk. A remote attacker who has valid administrator credentials for an affected system can send a specially crafted, remote connection request, write a file that consumes most of the available disk space on the system and cause application functions to operate abnormally and lead to a DoS condition. 

Mitigation
The vulnerability has been fixed in the version 12.5(0.97000.301), 12.0(1.22900.7), 12.5(0.202), 12.0(1.53).

Vulnerable software versions

Cisco Unity Connection: 12.5

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181003-unity-dos

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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