Cisco Security Advisory
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AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:U/RC:C
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A vulnerability in the TCP module of multiple Cisco products could allow an unauthenticated, remote attacker to disable TCP ports and cause an increase in CPU and memory usage, resulting in a denial of service (DoS) condition.
The vulnerability is due to a lack of rate limiting in the TCP listener application. An attacker could exploit this vulnerability by sending a TCP SYN flood or DoS traffic stream to a targeted device. An exploit could allow the attacker to block TCP listening ports and exhaust system resources such as CPU and memory.
Cisco has confirmed the vulnerability; however, software updates are not available.
To exploit this vulnerability, an attacker may need access to trusted, internal networks to send a TCP SYN flood or DoS traffic stream to the affected device. This access requirement may reduce the likelihood of a successful exploit.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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Cisco has released bug IDs CSCus50642, CSCus50662, CSCus50625, CSCus50657, and CSCus68315 for registered users, which contain additional details and up-to-date lists of affected product versions.
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Administrators are advised to contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to have network access.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to monitor affected systems.
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Software updates are not available.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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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 Release NA Final 2015-May-29
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