Vulnerability Details

Cisco NX-OS Software TCP Netstack Denial of Service Vulnerability

Published: 2016-05-04 12:16:24
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:C

Detection Type:
Remote Banner

Solution Type:
Vendor Patch

Impact:
An attacker could exploit this vulnerability by sending a specific TCP packet to an affected device on a TCP session that is already in a TIME_WAIT state. An exploit could allow the attacker to cause a reload of the TCP stack on the affected device, resulting in a DoS condition. This vulnerability can be exploited using either IPv4 or IPv6 packets. The vulnerability can be triggered by a crafted sequence of TCP packets destined for TCP ports listening on the device. The packets may use the IPv4 or IPv6 unicast address of any interface configured on the device. This vulnerability can be triggered only by traffic destined to an affected device and cannot be exploited using traffic that transits an affected device.

Detection Method:
Check the NX OS version.

Technical Details:
The vulnerability is due to improper processing of certain TCP packets in the closing sequence of a TCP session while the affected device is in a TIME_WAIT state.

Recommendations:
See the vendor advisory for a solution

Summary:
A vulnerability in the TCP stack of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2015-0718

References:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160302-netstack

Severity
High
CVSS Score
7.8
Published
2016-05-04
Modified
2018-11-13
Category
CISCO

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