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AUSCERT External Security Bulletin Redistribution
ESB-2024.0493.2
Cisco Unified Communications Products Remote Code Execution Vulnerability
29 January 2024
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Unified Communications Products
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2024-20253
Original Bulletin:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-rce-bWNzQcUm
Comment: CVSS (Max): 9.9 CVE-2024-20253 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H
Revision History: January 29 2024: Resolution changed to Patch/Upgrade
January 25 2024: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Unified Communications Products Remote Code Execution Vulnerability
Priority: Critical
Advisory ID: cisco-sa-cucm-rce-bWNzQcUm
First Published: 2024 January 24 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwd64245 CSCwd64276 CSCwd64292 CSCwe18773 CSCwe18830
CSCwe18840
CVE Names: CVE-2024-20253
Summary
o A vulnerability in multiple Cisco Unified Communications and Contact Center
Solutions products could allow an unauthenticated, remote attacker to
execute arbitrary code on an affected device.
This vulnerability is due to the improper processing of user-provided data
that is being read into memory. An attacker could exploit this
vulnerability by sending a crafted message to a listening port of an
affected device. A successful exploit could allow the attacker to execute
arbitrary commands on the underlying operating system with the privileges
of the web services user. With access to the underlying operating system,
the attacker could also establish root access on the affected device.
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-rce-bWNzQcUm
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products in the default
configuration:
Packaged Contact Center Enterprise (PCCE) ( CSCwe18830 )
Unified Communications Manager (Unified CM) ( CSCwd64245 )
Unified Communications Manager IM & Presence Service (Unified CM IM&P)
( CSCwd64276 )
Unified Communications Manager Session Management Edition (Unified CM
SME) ( CSCwd64245 )
Unified Contact Center Enterprise (UCCE) ( CSCwe18830 )
Unified Contact Center Express (UCCX) ( CSCwe18773 )
Unity Connection ( CSCwd64292 )
Virtualized Voice Browser (VVB) ( CSCwe18840 )
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:
Customer Collaboration Portal (CCP), formerly SocialMiner
Customer Voice Portal (CVP)
Emergency Responder (CER)
Finesse
Hosted Collaboration Mediation Fulfillment (HCM-F)
Prime Collaboration Deployment (PCD)
Prime License Manager (PLM)
Remote Expert Mobile
Unified Contact Center Domain Manager (CCDM)
Unified Contact Center Management Portal (Unified CCMP)
Unified Intelligence Center (CUIC)
Workarounds
o There are no workarounds that address this vulnerability. However, a
mitigation is available.
Establish access control lists (ACLs) on intermediary devices that separate
the Cisco Unified Communications or Cisco Contact Center Solutions cluster
from users and the rest of the network to allow access only to the ports of
deployed services.
For more information, see the Cisco Unified Communications Manager TCP and
UDP Port Usage Overview section of the System Configuration Guide for Cisco
Unified Communications Manager, Release 14 and SUs or the version that
corresponds with the deployed release, or the latest Port Utilization Guide
for Cisco Unified Contact Center Solutions .
Additionally, follow the best practices that are described in the latest
Security Guide for Cisco Unified Communications Manager or the latest
Security Guide for Cisco Unified ICM/Contact Center Enterprise .
While this mitigation has been deployed and was proven successful in a test
environment, customers should determine the applicability and effectiveness
in their own environment and under their own use conditions. Customers
should be aware that any workaround or mitigation that is implemented may
negatively impact the functionality or performance of their network based
on intrinsic customer deployment scenarios and limitations. Customers
should not deploy any workarounds or mitigations before first evaluating
the applicability to their own environment and any impact to such
environment.
Fixed Software
o 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 tables, 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.
Unified CM and Unified CM SME: CSCwd64245
Cisco Unified CM and Unified First Fixed Release
CM SME Release
11.5(1) Migrate to a fixed release.
12.5(1) 12.5(1)SU8 or
ciscocm.v1_java_deserial-CSCwd64245.cop.sha512
14 14SU3 or
ciscocm.v1_java_deserial-CSCwd64245.cop.sha512
15 Not vulnerable.
Unified CM IM&P: CSCwd64276
Cisco Unified CM IM&P First Fixed Release
Release
11.5(1) Migrate to a fixed release.
12.5(1) 12.5(1)SU8 or
ciscocm.cup-CSCwd64276_JavaDeserialization.cop.sha512
14 14SU3 or
ciscocm.cup-CSCwd64276_JavaDeserialization.cop.sha512
15 Not vulnerable.
Unity Connection: CSCwd64292
Cisco Unity First Fixed Release
Connection Release
11.5(1) Migrate to a fixed release.
12.5(1) 12.5(1)SU8 or
ciscocm.cuc.v1_java_deserial-CSCwd64292.k4.cop.sha512
14 14SU3 or
ciscocm.cuc.v1_java_deserial-CSCwd64292.k4.cop.sha512
15 Not vulnerable.
PCCE and UCCE: CSCwe18830
Cisco PCCE and UCCE Release First Fixed Release
12.0 and earlier Migrate to a fixed release.
12.5(1) and 12.5(2) ucos.v1_java_deserial-CSCwd64245.cop.sgn
15 Not vulnerable.
UCCX: CSCwe18773
Cisco UCCX Release First Fixed Release
12.0 and earlier Migrate to a fixed release.
12.5(1) ucos.v1_java_deserial-CSCwd64245.cop.sgn
15 Not vulnerable.
VVB: CSCwe18840
Cisco VVB Release First Fixed Release
12.0 and earlier. Migrate to a fixed release.
12.5(1) and 12.5(2) ucos.v1_java_deserial-CSCwd64245.cop.sgn
15 Not vulnerable.
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
o The Cisco PSIRT is not aware of any public announcements or malicious use
of the vulnerability that is described in this advisory.
Source
o Cisco would like to thank Julien Egloff from Synacktiv for reporting this
vulnerability.
Cisco Security Vulnerability Policy
o 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
o Subscribe
Related to This Advisory
o
URL
o https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-rce-bWNzQcUm
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2024-JAN-24 |
+----------+---------------------------+----------+--------+--------------+
Legal Disclaimer
o 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.
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