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Home / Cisco Security / Security Advisories





CISCO SECURITY ADVISORY


CISCO UNIFIED COMMUNICATIONS MANAGER DENIAL OF SERVICE VULNERABILITY

High
Advisory ID:
cisco-sa-cucm-dos-kkHq43We
First Published:
2024 August 21 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCwi68892

CVE-2024-20375

CWE-787

CVSS Score:
Base 8.6Click Icon to Copy Verbose Score
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
CVE-2024-20375

CWE-787


Download CSAF

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SUMMARY

 * A vulnerability in the SIP call processing function of Cisco Unified
   Communications Manager (Unified CM) and Cisco Unified Communications Manager
   Session Management Edition (Unified CM SME) could allow an unauthenticated,
   remote attacker to cause a denial of service (DoS) condition on an affected
   device.
   
   This vulnerability is due to improper parsing of SIP messages. An attacker
   could exploit this vulnerability by sending a crafted SIP message to an
   affected Cisco Unified CM or Cisco Unified CM SME device. A successful
   exploit could allow the attacker to cause the device to reload, resulting in
   a DoS condition that interrupts the communications of reliant voice and video
   devices.
   
   Cisco has released software updates that address this vulnerability. There
   are no workarounds that address this vulnerability.
   
   This advisory is available at the following link:
   https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-dos-kkHq43We

AFFECTED PRODUCTS


 * VULNERABLE PRODUCTS
   
   This vulnerability affects Cisco Unified CM and Cisco Unified CM SME,
   regardless of device configuration.
   
   For information about which Cisco software releases are vulnerable, see the
   Fixed Software section of this advisory.
   
   
   PRODUCTS CONFIRMED NOT VULNERABLE
   
   Only products listed in the Vulnerable Products section of this advisory are
   known to be affected by this vulnerability.
   
   Cisco has confirmed that this vulnerability does not affect the following
   Cisco products:
   
    * CallManager Express (CME)
    * Emergency Responder
    * IOS Software
    * IOS XE Software
    * Jabber Client
    * Packaged Contact Center Enterprise (PCCE) (including Outbound Dialer)
    * Prime Collaboration Deployment (PCD)
    * Prime License Manager (PLM)
    * Unified Border Element (CUBE)
    * Unified Communications Manager IM & Presence Service (Unified CM IM&P)
    * Unified Contact Center Enterprise (UCCE) (including Outbound Dialer)
    * Unified Contact Center Express (UCCX)
    * Unified Customer Voice Portal (CVP)
    * Unity Connection
    * Virtualized Voice Browser (VVB)
    * Voice Extensible Markup Language (VXML) Gateway

WORKAROUNDS

 * There are no workarounds that address this vulnerability.

FIXED SOFTWARE

 * Cisco has released free software updates that address the vulnerability
   described in this advisory. Customers with service contracts that entitle
   them to regular software updates should obtain security fixes through their
   usual update channels.
   
   Customers may only install and expect support for software versions and
   feature sets for which they have purchased a license. By installing,
   downloading, accessing, or otherwise using such software upgrades, customers
   agree to follow the terms of the Cisco software license:
   https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
   
   Additionally, customers may only download software for which they have a
   valid license, procured from Cisco directly, or through a Cisco authorized
   reseller or partner. In most cases this will be a maintenance upgrade to
   software that was previously purchased. Free security software updates do not
   entitle customers to a new software license, additional software feature
   sets, or major revision upgrades.
   
   The Cisco Support and Downloads page on Cisco.com provides information about
   licensing and downloads. This page can also display customer device support
   coverage for customers who use the My Devices tool.
   
   When considering software upgrades, customers are advised to regularly
   consult the advisories for Cisco products, which are available from the Cisco
   Security Advisories page, to determine exposure and a complete upgrade
   solution.
   
   In all cases, customers should ensure that the devices to be upgraded contain
   sufficient memory and confirm that current hardware and software
   configurations will continue to be supported properly by the new release. If
   the information is not clear, customers are advised to contact the Cisco
   Technical Assistance Center (TAC) or their contracted maintenance providers.
   
   
   CUSTOMERS WITHOUT SERVICE CONTRACTS
   
   Customers who purchase directly from Cisco but do not hold a Cisco service
   contract and customers who make purchases through third-party vendors but are
   unsuccessful in obtaining fixed software through their point of sale should
   obtain upgrades by contacting the Cisco TAC:
   https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html
   
   Customers should have the product serial number available and be prepared to
   provide the URL of this advisory as evidence of entitlement to a free
   upgrade.
   
   
   FIXED RELEASES
   
   In the following table, the left column lists Cisco software releases. The
   right column indicates whether a release is affected by the vulnerability
   that is described in this advisory and the first release that includes the
   fix for this vulnerability. Customers are advised to upgrade to an
   appropriate fixed software release as indicated in this section.
   
   Cisco Unified CM and Unified CM SME Release First Fixed Release 12.5(1)
   12.5(1)SU9 14 14SU4 15 15SU1
   
   The Cisco Product Security Incident Response Team (PSIRT) validates only the
   affected and fixed release information that is documented in this advisory.

EXPLOITATION AND PUBLIC ANNOUNCEMENTS

 * The Cisco PSIRT is not aware of any public announcements or malicious use of
   the vulnerability that is described in this advisory.

SOURCE

 * Cisco would like to thank the U.S. National Security Agency (NSA) for
   reporting this vulnerability.

CISCO SECURITY VULNERABILITY POLICY

 * To learn about Cisco security vulnerability disclosure policies and
   publications, see the Security Vulnerability Policy. This document also
   contains instructions for obtaining fixed software and receiving security
   vulnerability information from Cisco.

SUBSCRIBE TO CISCO SECURITY NOTIFICATIONS

 * Subscribe

RELATED TO THIS ADVISORY

 * 

URL

 * https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-dos-kkHq43We

REVISION HISTORY

 * Version Description Section Status Date 1.0 Initial public release. - Final
   2024-AUG-21
   
   Show Less

--------------------------------------------------------------------------------

LEGAL DISCLAIMER

 * THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF
   GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
   FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR
   MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE
   RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
   
   A standalone copy or paraphrase of the text of this document that omits the
   distribution URL is an uncontrolled copy and may lack important information
   or contain factual errors. The information in this document is intended for
   end users of Cisco products.

FEEDBACK

 * 
   Leave additional feedback

CISCO SECURITY VULNERABILITY POLICY

 * To learn about Cisco security vulnerability disclosure policies and
   publications, see the Security Vulnerability Policy. This document also
   contains instructions for obtaining fixed software and receiving security
   vulnerability information from Cisco.

SUBSCRIBE TO CISCO SECURITY NOTIFICATIONS

 * Subscribe

RELATED TO THIS ADVISORY

 * 


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