Vulnerability identifier: #VU25008

Vulnerability risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3111

CWE-ID: CWE-20

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Cisco IP Conference Phone 7832
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Conference Phone 7832 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Conference Phone 8832
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Conference Phone 8832 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 6821 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 6841 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 6851 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 6861 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 6871 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 7811
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 7821
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 7841
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 7861
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 7811 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 7821 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 7841 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 7861 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 8811
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 8841
Hardware solutions / Office equipment, IP-phones, print servers
Cisco Wireless IP Phone 8851
Hardware solutions / Office equipment, IP-phones, print servers
Cisco Wireless IP Phone 8845
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 8811 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 8841 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 8851 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 8861 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 8845 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 8865 with Multiplatform Firmware
Hardware solutions / Office equipment, IP-phones, print servers
Cisco Unified IP Conference Phone 8831
Hardware solutions / Office equipment, IP-phones, print servers
Cisco Unified IP Conference Phone 8831 for Third-Party Call Control
Hardware solutions / Office equipment, IP-phones, print servers
Cisco Wireless IP Phone 8821
Hardware solutions / Office equipment, IP-phones, print servers
Cisco Wireless IP Phone 8821-EX
Hardware solutions / Office equipment, IP-phones, print servers
Cisco IP Phone 8861
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco IP Phone 8865
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to missing checks when processing Cisco Discovery Protocol messages. A remote attacker on the local network can send a specially crafted Cisco Discovery Protocol packet to the targeted IP phone and execute arbitrary code with root privileges or cause a reload of an affected IP phone, resulting in a denial of service (DoS) condition.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco IP Conference Phone 7832: All versions

Cisco IP Conference Phone 7832 with Multiplatform Firmware: All versions

Cisco IP Conference Phone 8832: All versions

Cisco IP Conference Phone 8832 with Multiplatform Firmware: All versions

Cisco IP Phone 6821 with Multiplatform Firmware: All versions

Cisco IP Phone 6841 with Multiplatform Firmware: All versions

Cisco IP Phone 6851 with Multiplatform Firmware: All versions

Cisco IP Phone 6861 with Multiplatform Firmware: All versions

Cisco IP Phone 6871 with Multiplatform Firmware: All versions

Cisco IP Phone 7811: All versions

Cisco IP Phone 7821: All versions

Cisco IP Phone 7841: All versions

Cisco IP Phone 7861: All versions

Cisco IP Phone 7811 with Multiplatform Firmware: All versions

Cisco IP Phone 7821 with Multiplatform Firmware: All versions

Cisco IP Phone 7841 with Multiplatform Firmware: All versions

Cisco IP Phone 7861 with Multiplatform Firmware: All versions

Cisco IP Phone 8811: All versions

Cisco IP Phone 8841: All versions

Cisco Wireless IP Phone 8851: All versions

Cisco IP Phone 8861: All versions

Cisco Wireless IP Phone 8845: All versions

Cisco IP Phone 8865: All versions

Cisco IP Phone 8811 with Multiplatform Firmware: All versions

Cisco IP Phone 8841 with Multiplatform Firmware: All versions

Cisco IP Phone 8851 with Multiplatform Firmware: All versions

Cisco IP Phone 8861 with Multiplatform Firmware: All versions

Cisco IP Phone 8845 with Multiplatform Firmware: All versions

Cisco IP Phone 8865 with Multiplatform Firmware: All versions

Cisco Unified IP Conference Phone 8831: 10.3.1

Cisco Unified IP Conference Phone 8831 for Third-Party Call Control: 9.3.4 SR3

Cisco Wireless IP Phone 8821: 11.0.5 SR1

Cisco Wireless IP Phone 8821-EX: 11.0.5 SR1

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External links
http://packetstormsecurity.com/files/156203/Cisco-Discovery-Protocol-CDP-Remote-Device-Takeover.html
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-voip-phones-rce-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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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