Cisco Security Advisory
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AV:L/AC:L/Au:S/C:N/I:N/A:C/E:H/RL:U/RC:C
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Cisco IOS XR Software is affected by a denial of service (DoS) vulnerability that could allow an authenticated, local attacker to trigger a reload of the affected device by locally generating certain Internet Control Message Protocol (ICMP) messages.
The vulnerability is due to a combination of Silicon Packet Processor (SPP) buffer corruption and a mutex issue when an extended ping with timeout=0 and a large packet size is terminated with Control-C. An attacker could exploit this vulnerability by sending large ICMP packets from an affected device.
Cisco has confirmed this vulnerability in a security notice; however, software updates are not available.
To exploit this vulnerability, the attacker would need to authenticate locally to the targeted system. This access requirement decreases the likelihood of a successful exploit.
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Customers are advised to consult Cisco bug ID CSCui60347 for the most complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco IOS XR Software versions 4.3 and prior were vulnerable. Later releases of Cisco IOS XR Software may also be affected.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 access local systems.
Administrators are advised to allow only trusted users to have network access.
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 2013-Aug-13
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