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 RADIUS implementation of the Cisco Wireless LAN Controller (WLC) could allow an unauthenticated, remote attacker to cause a partial denial of service (DoS) condition by disconnecting user sessions.
The vulnerability is due to a lack of proper input validation of the RADIUS Disconnect-Request packet. An attacker could exploit this vulnerability by sending crafted RADIUS UDP Disconnect-Request packets to the affected device. An exploit could allow the attacker to cause a partial DoS condition due to the disconnect of random user sessions.
Cisco has confirmed the vulnerability; however, software updates are not available.
To exploit this vulnerability, the attacker must send crafted RADIUS Disconnect-Request packets to the targeted system, making exploitation more difficult in environments that restrict network access from untrusted sources.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
Cisco would like to thank security researcher Casper Joost Eyckelhof from Quarantainenet BV for reporting this vulnerability.
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Cisco has released bug ID CSCuw29419 for registered users, which contains additional details and an up-to-date list 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-Sep-21
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