Cisco IP Phone 8800 prior 12.5(1)SR1 Web-based Management Interface Connection Request input validation

Summaryinfo

A vulnerability classified as problematic has been found in Cisco IP Phone 8800. This issue affects some unknown processing of the component Web-based Management Interface. This manipulation as part of Connection Request causes input validation. This vulnerability appears as CVE-2019-1766. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Cisco IP Phone 8800 (IP Phone Software). Affected by this vulnerability is some unknown processing of the component Web-based Management Interface. The manipulation as part of a Connection Request leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

A vulnerability in the web-based management interface of Session Initiation Protocol (SIP) Software for Cisco IP Phone 8800 Series could allow an unauthenticated, remote attacker to cause high disk utilization, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software does not restrict the maximum size of certain files that can be written to disk. An attacker who has valid administrator credentials for an affected system could exploit this vulnerability by sending a crafted, remote connection request to an affected system. A successful exploit could allow the attacker to write a file that consumes most of the available disk space on the system, causing application functions to operate abnormally and leading to a DoS condition. This vulnerability affects Cisco IP Phone 8800 Series products running a SIP Software release prior to 12.5(1)SR1.

The bug was discovered 03/20/2019. The weakness was presented 03/22/2019 as cisco-sa-20190320-ipfudos as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. This vulnerability is known as CVE-2019-1766 since 12/06/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $5k-$25k.

Upgrading to version 12.5(1)SR1 eliminates this vulnerability.

See VDB-132102, VDB-132101 and VDB-132100 for similar entries. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• IP Phone Software

Vendor

• Cisco

Name

• IP Phone 8800

License

• commercial

Website

• Vendor: https://www.cisco.com/

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