Denial of service in Cisco IP Phone 7800 and 8800 Series

1) Input validation error

EUVDB-ID: #VU17842

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1684

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows an adjacent attacker to perform a denial of service (DoS) attack.

The vulnerability exists in the Cisco Discovery Protocol or Link Layer Discovery Protocol (LLDP) implementation due to missing length validation of certain Cisco Discovery Protocol or LLDP packet header fields. An adjacent attacker can send a malicious Cisco Discovery Protocol or LLDP packet and cause the affected phone to reload unexpectedly, resulting in a temporary DoS condition.

Mitigation

The vulnerability has been addressed in the versions 12.6(1)MN80, 12.5(1)SR2, 12.5(1)ES1, 12.1(1)SR2.1.

Vulnerable software versions

Cisco 8800 Series IP Phones: 12.1.1

Cisco 7800 Series IP Phones: 12.1.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190220-cdp-lldp-dos

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).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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