Denial of service in Cisco IOS XE

Published: 2017-11-08 11:23:39
Severity Low
Patch available YES
Number of vulnerabilities 1
CVSSv2 3.7 (AV:N/AC:L/Au:N/C:N/I:N/A:P/E:U/RL:OF/RC:C)
CVSSv3 6.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE ID CVE-2017-12319
CWE ID CWE-20
Exploitation vector Network
Public exploit Not available
Vulnerable software Cisco IOS XE
Vulnerable software versions Cisco IOS XE 16.1
Cisco IOS XE 16.2(1.9)
Cisco IOS XE 16.2.1
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Vendor URL Cisco Systems, Inc
Advisory type Public

Security Advisory

1) Improper input validation

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software due to changes in the implementation of the BGP MPLS-Based Ethernet VPN RFC (RFC 7432) draft. A remote attacker can send a specially crafted BGP Inclusive Multicast Ethernet Tag Route or BGP EVPN MAC/IP Advertisement Route update packet, corrupt the BGP routing table and cause the device to reload.

Successful exploitation of the vulnerability results in denial of service.

Remediation

Update to version 16.3 or later.

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171103-bgp

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