Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2019-1859

Severity CVSS v4.0:
Pending analysis
Type:
CWE-295 Improper Certificate Validation
Publication date:
03/05/2019
Last modified:
13/10/2020

Description

A vulnerability in the Secure Shell (SSH) authentication process of Cisco Small Business Switches software could allow an attacker to bypass client-side certificate authentication and revert to password authentication. The vulnerability exists because OpenSSH mishandles the authentication process. An attacker could exploit this vulnerability by attempting to connect to the device via SSH. A successful exploit could allow the attacker to access the configuration as an administrative user if the default credentials are not changed. There are no workarounds available; however, if client-side certificate authentication is enabled, disable it and use strong password authentication. Client-side certificate authentication is disabled by default.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.20 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
7.20
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:L/Au:S/C:P/I:P/A:P CVSS v2.0 Severity and Metrics:

Base Score: 6.50 MEDIUM
Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): Single
Confidentiality (C): Physical
Integrity (I): Physical
Availability (A): Physical

Base Score 2.0
6.50
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:cisco:sg200-50_firmware:*:*:*:*:*:*:*:* 1.4.10.6 (excluding)
cpe:2.3:h:cisco:sg200-50:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:sg200-50p_firmware:*:*:*:*:*:*:*:* 1.4.10.6 (excluding)
cpe:2.3:h:cisco:sg200-50p:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:sg200-50fp_firmware:*:*:*:*:*:*:*:* 1.4.10.6 (excluding)
cpe:2.3:h:cisco:sg200-50fp:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:sg200-26_firmware:*:*:*:*:*:*:*:* 1.4.10.6 (excluding)
cpe:2.3:h:cisco:sg200-26:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:sg200-26p_firmware:*:*:*:*:*:*:*:* 1.4.10.6 (excluding)
cpe:2.3:h:cisco:sg200-26p:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:sg200-26fp_firmware:*:*:*:*:*:*:*:* 1.4.10.6 (excluding)
cpe:2.3:h:cisco:sg200-26fp:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:sg200-18_firmware:*:*:*:*:*:*:*:* 1.4.10.6 (excluding)
cpe:2.3:h:cisco:sg200-18:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:sg200-10fp_firmware:*:*:*:*:*:*:*:* 1.4.10.6 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools