Cisco Security Advisory
Cisco Secure Access Control Server SSH Login Denial of Service Vulnerability
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AV:N/AC:L/Au:S/C:N/I:N/A:P/E:F/RL:U/RC:C
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A vulnerability in the Secure Shell (SSH) feature of the Cisco Secure Access Control Server (ACS) could allow an authenticated, remote attacker to cause a partial denial of service (DoS) condition due to the SSH screen process unexpectedly terminating.
The vulnerability is due to improper input validation of user commands entered at the command line interface (CLI) or GUI. An attacker could exploit this vulnerability by logging into the affected device and executing crafted user commands. An exploit could allow the attacker to cause a partial DoS due to the SSH screen processes unexpectedly terminating. That SSH connection is then lost and the user must log in and authenticate again.
Cisco has confirmed the vulnerability; however, software updates are not available.
To exploit this vulnerability, an attacker must authenticate to the targeted 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 ID CSCuw24694 for registered users, which contains additional details and an up-to-date list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco Secure ACS Solution Engine release 5.7(0.15) was vulnerable. Later releases of Cisco Secure ACS Solution Engine may also be vulnerable.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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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 are advised to allow only privileged users to access administration or management 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-Sep-18
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