BIOS UEFI Setup Stored privileges management

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in BIOS. Impacted is an unknown function of the component UEFI Handler. Executing a manipulation of the argument Setup as part of Variable can lead to privileges management (Stored). This vulnerability is registered as CVE-2014-2961. No exploit is available. This vulnerability has a historic impact due to its background and reception. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in BIOS. It has been declared as critical. This vulnerability affects an unknown code block of the component UEFI Handler. The manipulation of the argument Setup as part of a Variable leads to a privileges management vulnerability (Stored). The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was published 05/27/2014 by Corey Kallenberg, Xeno Kovah, John Butterworth and Sam Cornwell with MITRE as VU#758382 as confirmed vulnerability note (US CERT). The advisory is shared for download at kb.cert.org. This vulnerability was named CVE-2014-2961 since 04/21/2014. The exploitation appears to be difficult. The attack needs to be approached locally. The requirement for exploitation is a single authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/20/2021). The MITRE ATT&CK project declares the attack technique as T1068. This vulnerability has a historic impact due to its background and reception. The advisory points out:

As discussed in recent conference publications (CanSecWest 2014, Syscan 2014, and Hack-in-the-Box 2014) certain UEFI implementations do not correctly protect and validate information contained in the 'Setup' UEFI variable. On some systems, this variable can be overwritten using operating system APIs. Exploitation of this vulnerability could potentially lead to bypass of security features, such as secure boot, and/or denial of service for the platform.

The vulnerability was handled as a non-public zero-day exploit for at least 270 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 76117 (Intel Multiple Products Crafted UEFI Variable Handling Security Bypass), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc..

Upgrading eliminates this vulnerability. The vulnerability note contains the following remark:

Intel has released firmware updates for affected systems.

The vulnerability is also documented in the databases at X-Force (93716), Tenable (76117), SecurityFocus (BID 67947†) and Vulnerability Center (SBV-45231†). Additional details are provided at security-center.intel.com. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Dell Computer Corporation
  • Intel Corporation
  • American Megatrends Incorporated
  • ASUSTeK Computer Inc.
  • Hewlett-Packard Company
  • Insyde Software Corporation
  • Lenovo
  • Phoenix Technologies Ltd.

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.1

VulDB Base Score: 7.0
VulDB Temp Score: 6.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Name: Stored
Class: Privileges management / Stored
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Unproven
Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 76117
Nessus Name: Intel Multiple Products Crafted UEFI Variable Handling Security Bypass
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/30/2013 🔍
04/21/2014 +234 days 🔍
05/27/2014 +36 days 🔍
06/09/2014 +13 days 🔍
06/09/2014 +0 days 🔍
06/09/2014 +0 days 🔍
06/18/2014 +9 days 🔍
07/01/2014 +13 days 🔍
06/20/2021 +2546 days 🔍

Sourcesinfo

Advisory: VU#758382
Researcher: Corey Kallenberg, Xeno Kovah, John Butterworth, Sam Cornwell
Organization: MITRE
Status: Confirmed

CVE: CVE-2014-2961 (🔍)
GCVE (CVE): GCVE-0-2014-2961
GCVE (VulDB): GCVE-100-13480
X-Force: 93716 - Multiple Intel products UEFI security bypass, Low Risk
SecurityFocus: 67947 - Multiple Products UEFI Secure Boot CVE-2014-2961 Local Security Bypass Vulnerability
Vulnerability Center: 45231 - Intel Multiple Products Local Bypass Restrictions or DoS due to Improper UEFI Variables Validation by the BIOS, Low

Misc.: 🔍

Entryinfo

Created: 06/09/2014 23:46
Updated: 06/20/2021 18:17
Changes: 06/09/2014 23:46 (51), 06/01/2017 04:41 (20), 06/20/2021 18:17 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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