Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2019-1736

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
23/09/2020
Last modified:
23/10/2020

Description

A vulnerability in the firmware of the Cisco UCS C-Series Rack Servers could allow an authenticated, physical attacker to bypass Unified Extensible Firmware Interface (UEFI) Secure Boot validation checks and load a compromised software image on an affected device. The vulnerability is due to improper validation of the server firmware upgrade images. An attacker could exploit this vulnerability by installing a server firmware version that would allow the attacker to disable UEFI Secure Boot. A successful exploit could allow the attacker to bypass the signature validation checks that are done by UEFI Secure Boot technology and load a compromised software image on the affected device. A compromised software image is any software image that has not been digitally signed by Cisco.

Impact

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

Base Score: 6.60 MEDIUM
Vector: CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

Base Score 3.x
6.60
Severity 3.x
MEDIUM
Vector 2.0
AV:L/AC:M/Au:N/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 6.90 MEDIUM
Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C

Attack Vector (AV): Local
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete

Base Score 2.0
6.90
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:cisco:fmc1000-k9_bios:*:*:*:*:*:*:*:* 4.0.1f.0 (excluding)
cpe:2.3:o:cisco:fmc1000-k9_firmware:*:*:*:*:*:*:*:* 4.0.2h (excluding)
cpe:2.3:o:cisco:fmc2500-k9_bios:*:*:*:*:*:*:*:* 4.0.1f.0 (excluding)
cpe:2.3:o:cisco:fmc2500-k9_firmware:*:*:*:*:*:*:*:* 4.0.2h (excluding)
cpe:2.3:o:cisco:fmc4500-k9_bios:*:*:*:*:*:*:*:* 4.0.1f.0 (excluding)
cpe:2.3:o:cisco:fmc4500-k9_firmware:*:*:*:*:*:*:*:* 4.0.2h (excluding)
cpe:2.3:o:cisco:sns-3515-k9_bios:*:*:*:*:*:*:*:* 4.0.2d (excluding)
cpe:2.3:o:cisco:sns-3515-k9_firmware:*:*:*:*:*:*:*:* 4.0.2h (excluding)
cpe:2.3:o:cisco:sns-3595-k9_bios:*:*:*:*:*:*:*:* 4.0.2d (excluding)
cpe:2.3:o:cisco:sns-3595-k9_firmware:*:*:*:*:*:*:*:* 4.0.2h (excluding)
cpe:2.3:o:cisco:sns-3615-k9_bios:*:*:*:*:*:*:*:* 4.0.1i (excluding)
cpe:2.3:o:cisco:sns-3615-k9_firmware:*:*:*:*:*:*:*:* 4.0.1g (excluding)
cpe:2.3:o:cisco:sns-3655-k9_bios:*:*:*:*:*:*:*:* 4.0.1i (excluding)
cpe:2.3:o:cisco:sns-3655-k9_firmware:*:*:*:*:*:*:*:* 4.0.1g (excluding)
cpe:2.3:o:cisco:sns-3695-k9_bios:*:*:*:*:*:*:*:* 4.0.1i (excluding)

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


References to Advisories, Solutions, and Tools