Cisco Security Advisory
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AV:A/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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A vulnerability in the Integrated Services Digital Network (ISDN) processing code of Cisco IOS could allow an unauthenticated, adjacent attacker to cause a reload of the affected device.
The vulnerability is due to improper processing of malformed ISDN Q931 SETUP messages. An attacker could exploit this vulnerability by sending malformed Q931 SETUP messages to be processed by a targeted device. An exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition.
Cisco has confirmed the vulnerability and software updates are available.
To exploit this vulnerability, an attacker must be on the same broadcast or collision domain as the targeted device. This access requirement decreases 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 CSCut37890 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 apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
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Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.
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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-14
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