Cisco Security Advisory
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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
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A vulnerability in the local interface of Cisco BroadWorks Network Server could allow an unauthenticated, remote attacker to exhaust system resources, causing a denial of service (DoS) condition.
This vulnerability exists because rate limiting does not occur for certain incoming TCP connections. An attacker could exploit this vulnerability by sending a high rate of TCP connections to the server. A successful exploit could allow the attacker to cause TCP connection resources to grow rapidly until the Cisco BroadWorks Network Server becomes unusable.
Note: To recover from this vulnerability, either Cisco BroadWorks Network Server software must be restarted or the Cisco BroadWorks Network Server node must be rebooted. For more information, see the Details section of this advisory.
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-bw-tcp-dos-KEdJCxLs
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Vulnerable Products
This vulnerability affects Cisco BroadWorks Network Server if it is running a vulnerable software release with the default 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:
- BroadWorks Ansible Playbook
- BroadWorks Application Delivery Platform
- BroadWorks Application Server
- BroadWorks Database Server
- BroadWorks Database Troubleshooting Server
- BroadWorks Execution Server
- BroadWorks Media Server
- BroadWorks Messaging Server
- BroadWorks Network Database Server
- BroadWorks Network Function Manager
- BroadWorks Profile Server
- BroadWorks Service Control Function Server
- BroadWorks Service License Report Tool
- BroadWorks Sharing Server
- BroadWorks Software Manager
- BroadWorks Video Server
- BroadWorks WebRTC Server
- BroadWorks Xtended Services Platform
- BroadWorks pre-Install Check
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This vulnerability can cause Cisco BroadWorks Network Server to run out of system resources.
If the node is responsive, administrators can issue the restartbw command to clear the condition as described in Section 7.7, "Restart Server," and in Section 21.18, "restartbw," of the Cisco BroadWorks Maintenance Guide.
If the node is not responsive, it must be rebooted.
These actions can cause the system to be unavailable for a period of time and should be used with care in non-redundant environments. The DoS condition will reoccur unless the attack traffic source is identified and blocked.
If exploitation is suspected, contact the Cisco Technical Assistance Center (TAC) for assistance.
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There are no workarounds that address this vulnerability.
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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.htmlAdditionally, 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 BroadWorks Network Server First Fixed Release 22.0 Migrate to a fixed release. 23.0 AP.ns.23.0.1075.ap385072.Linux-x86_64.zip Release Independent (RI) RI.2023.02 The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.
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To determine if the best security practices are in use for Cisco BroadWorks Network Server, see Section 6.3, "Network Server Ports," in the Cisco BroadWorks Server Security Guide.
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The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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This vulnerability was found during the resolution of a Cisco TAC support case.
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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.
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Show LessVersion Description Section Status Date 1.0 Initial public release. — Final 2023-APR-19
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