PT-2019-4319 · Cisco · Cisco Ios Xr

Published 2019-11-20 · Updated 2020-10-16 · CVE-2019-15998

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Cisco IOS XR Software (affected versions not specified)

Description A vulnerability in the access-control logic of the NETCONF over Secure Shell (SSH) of Cisco IOS XR Software may allow connections despite an access control list (ACL) that is configured to deny access to the NETCONF over SSH of an affected device. The vulnerability is due to a missing check in the NETCONF over SSH access control list (ACL). An attacker could exploit this vulnerability by connecting to an affected device using NETCONF over SSH. A successful exploit could allow the attacker to connect to the device on the NETCONF port. Valid credentials are required to access the device. This vulnerability does not affect connections to the default SSH process on the device.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Access Control

Missing Authorization

Weakness Enumeration

CWE-284

CWE-862

Related Identifiers

BDU:2020-00034

CVE-2019-15998

Affected Products

Cisco Ios Xr

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2019-15998 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191120-iosxr-ssh-bypass · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2019-15998 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-00034 · Security Note