PT-2017-2016 · Cisco · Cisco Asr 920 Series Aggregation Services Routers+1

Published 2017-03-22 · Updated 2017-07-12 · CVE-2017-3859

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Cisco ASR 920 Series Aggregation Services Routers versions 3.13 through 3.18

Description A vulnerability in the DHCP code for the Zero Touch Provisioning feature could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a format string vulnerability when processing a crafted DHCP packet for Zero Touch Provisioning. An attacker could exploit this vulnerability by sending a specially crafted DHCP packet to an affected device, resulting in a denial of service (DoS) condition.

Recommendations For versions 3.13 through 3.18, update to a newer version of Cisco IOS XE Software that addresses this vulnerability. As a temporary workaround, consider disabling the DHCP server port to minimize the risk of exploitation.

Fix

DoS

Use of Externally-Controlled Format String

Weakness Enumeration

CWE-134

Related Identifiers

BDU:2017-01183

CVE-2017-3859

Affected Products

Cisco Asr 920 Series Aggregation Services Routers

Cisco Ios Xe

References · 6

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170322-ztp · Vendor Advisory
• https://bdu.fstec.ru/vul/2017-01183 · Security Note
• https://osv.dev/vulnerability/CVE-2017-3859 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-3859 · Security Note
• http://securitytracker.com/id/1038104 · Note
• http://securityfocus.com/bid/97008 · Note