Vulnerability identifier: #VU12788

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0325

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco 7800 Series IP Phones
Hardware solutions / Office equipment, IP-phones, print servers
Cisco 6800 Series IP Phones
Hardware solutions / Office equipment, IP-phones, print servers

Vendor: Cisco Systems, Inc

Description

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

The weakness exists in the Session Initiation Protocol (SIP) call-handling functionality due to incomplete input validation of SIP Session Description Protocol (SDP) parameters by the SDP parser. A remote attacker can send a specially crafted SIP packet, cause all active phone calls on the affected phone to be dropped while the SIP process on the phone unexpectedly restarts and cause the service to crash.

Mitigation
Update to version 12.1(1)MN130.

Vulnerable software versions

Cisco 7800 Series IP Phones: All versions

Cisco 6800 Series IP Phones: All versions

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180516-ip-phone-dos

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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.