Cisco Security Advisory
Cisco IOS Software DLSw Information Disclosure Vulnerability
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AV:N/AC:L/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C
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A vulnerability in the DLSw feature of Cisco IOS could allow an unauthenticated, remote attacker to extract information from previously processed packets.
The vulnerability is due to the lack of initialization of packet buffers. An attacker could exploit this vulnerability by connecting to the DLSw port (TCP/2067). An exploit could allow the attacker to extract potentially sensitive information, including clear-text passwords and SNMP community strings from previously processed packets.
This vulnerability was reported to Cisco by Tate Hansen and John McLeod of FishNet Security, and Kyle Rainey.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker need to be able to connect to the DLSw port on a targeted device which may require access to trusted, internal networks. In addition, the attacker may need to acquire additional information about the device such as whether or not DLSw is enabled. These requirements 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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Customers are advised to consult Cisco bug ID CSCur14014 for the most complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco IOS Software version 15.4(2)T3 and prior were vulnerable. Later releases of Cisco IOS Software 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 apply the appropriate updates.
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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Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
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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 2014-Nov-18
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