CVE-2019-1736

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.

CVSS v3.0 6.6 MEDIUM
CVSS v2.0 6.9 MEDIUM

6.6^/10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 0.7 / Impact : 5.9

Attack Vector PHYSICAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

6.9^/10

CVSS v2.0 : MEDIUM

V2 Legend

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

Exploitability : 3.4 / Impact : 10.0

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200219-ucs-boot-bypass	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

Configuration 2 (hide)

Configuration 3 (hide)

Configuration 4 (hide)

Configuration 5 (hide)

Configuration 6 (hide)

Configuration 7 (hide)

Configuration 8 (hide)

Configuration 9 (hide)

Configuration 10 (hide)

Configuration 11 (hide)

OR	cpe:2.3:a:cisco:identity_services_engine:2.4\(0.357\):::::::*
	cpe:2.3:a:cisco:identity_services_engine:2.6\(0.156\):::::::*
	cpe:2.3:a:cisco:unified_computing_system:3.2\(3h\)c:::::::*

Information

Published : 2020-09-22 18:15

Updated : 2020-10-23 11:21

NVD link : CVE-2019-1736

Mitre link : CVE-2019-1736

JSON object : View

CWE

CWE-347

Improper Verification of Cryptographic Signature

Products Affected

cisco

sns-3515-k9_bios
sns-3655-k9_bios
fmc1000-k9_firmware
tg5004-k9-rf_bios
sns-3595-k9_firmware
fmc4500-k9_firmware
fmc1000-k9_bios
identity_services_engine
sns-3615-k9_bios
sns-3695-k9_bios
sns-3595-k9_bios
sns-3615-k9_firmware
tg5004-k9_bios
sns-3655-k9_firmware
fmc4500-k9_bios
tg5004-k9_firmware
sns-3515-k9_firmware
tg5004-k9-rf_firmware
fmc2500-k9_bios
fmc2500-k9_firmware
sns-3695-k9_firmware
unified_computing_system

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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."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-347"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2019-1736", "ASSIGNER": "psirt@cisco.com"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 6.9, "accessVector": "LOCAL", "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C", "authentication": "NONE", "integrityImpact": "COMPLETE", "accessComplexity": "MEDIUM", "availabilityImpact": "COMPLETE", "confidentialityImpact": "COMPLETE"}, "severity": "MEDIUM", "acInsufInfo": false, "impactScore": 10.0, "obtainAllPrivilege": false, "exploitabilityScore": 3.4, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.6, "attackVector": "PHYSICAL", "baseSeverity": "MEDIUM", "vectorString": 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6.6 /10