Cisco Unified Communications Manager IM Authentication Service Authentication Request input validation

Summaryinfo

A vulnerability identified as problematic has been detected in Cisco Unified Communications Manager IM, Presence, TelePresence Video Communication Server and Expressway Series. The impacted element is an unknown function of the component Authentication Service. This manipulation as part of Authentication Request causes input validation. This vulnerability appears as CVE-2019-1845. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Cisco Unified Communications Manager IM, Presence, TelePresence Video Communication Server and Expressway Series (Unified Communication Software) (affected version not known). It has been declared as problematic. Affected by this vulnerability is some unknown functionality of the component Authentication Service. The manipulation as part of a Authentication 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 authentication service of the Cisco Unified Communications Manager IM and Presence (Unified CM IM&P) Service, Cisco TelePresence Video Communication Server (VCS), and Cisco Expressway Series could allow an unauthenticated, remote attacker to cause a service outage for users attempting to authenticate, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient controls for specific memory operations. An attacker could exploit this vulnerability by sending a malformed Extensible Messaging and Presence Protocol (XMPP) authentication request to an affected system. A successful exploit could allow the attacker to cause an unexpected restart of the authentication service, preventing users from successfully authenticating. Exploitation of this vulnerability does not impact users who were authenticated prior to an attack.

The weakness was presented 06/05/2019 as cisco-sa-20190605-cucm-imp-dos as confirmed advisory (Website). The advisory is shared at tools.cisco.com. This vulnerability is known as CVE-2019-1845 since 12/06/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/28/2023).

The commercial vulnerability scanner Qualys is able to test this issue with plugin 38768 (Cisco TelePresence VCS, and Cisco Expressway Series Denial of Service Vulnerability(cisco-sa-20190605-cucm-imp-dos)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Unified Communication Software

Vendor

• Cisco

Name

• Expressway Series
• Presence
• TelePresence Video Communication Server
• Unified Communications Manager IM

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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