Unauthorized Modification of UEFI Variables in UEFI Systems
Unauthorized Modification of UEFI Variables in UEFI Systems
Unauthorized Modification of UEFI Variables in UEFI Systems
Lenovo Security Advisory: LEN-2014-002
Potential Impact: Modifications of UEFI variables
Severity: Medium
Summary:
Certain firmware implementations may not correctly protect and validate information contained in certain UEFI variables. Exploitation of such vulnerabilities could potentially lead to bypass of security features and/or denial of service for the platform.
Description:
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.
Affected Products:
Please click to expand for more info:
ThinkPad
ThinkCentre
ThinkStation
ThinkServer & Storage
Lenovo Notebook
| System | Status | Minimum version including Fix |
Release |
|---|---|---|---|
| B40-30/B50-30/E40-30 | Not Affected | − | − |
| B40-45/B50-45 | Not Affected | − | − |
| B40-70/B50-70/E40-70/E50-70 | Not Affected | − | − |
| B4400 | Not Affected | − | − |
| B490 | Affected | H9ET75WW | http://support.lenovo.com/us/en/downloads/DS032260 |
| B5400 | Not Affected | − | − |
| E10-30 | Affected | A5CN36WW(V3.7) | http://support.lenovo.com/us/en/products/laptops-and-netbooks/lenovo-e-series-laptops/lenovo-e10-30/downloads/DS100550 |
| E4430 | Not Affected | − | − |
| Flex 10 | Affected | 93CN57WW(V9.7) | Win8: http://support.lenovo.com/us/en/products/laptops-and-netbooks/flex-series/flex-10-notebook-lenovo/downloads/DS101001 Win8.1: http://support.lenovo.com/us/en/products/laptops-and-netbooks/flex-series/flex-10-notebook-lenovo/downloads/DS100999 |
| Flex 2 14/Flex 2 15 (Baytrail-M) | Affected | A3CN32WW | http://support.lenovo.com/us/en/products/laptops-and-netbooks/flex-series/flex-2-14-notebook-lenovo/downloads/DS101207 |
| Flex 2 14/Flex 2 15 (Broadwell) | Not Affected | − | − |
| Flex 2 14/Flex 2 15 (Haswell) | Affected | A0CN26WW | http://support.lenovo.com/us/en/products/laptops-and-netbooks/flex-series/flex-2-14-notebook-lenovo/downloads/DS101193 |
| Flex 2 14D/Flex 2 15D | Affected | 9FCN22WW | http://support.lenovo.com/us/en/products/laptops-and-netbooks/flex-series/flex-2-14d-notebook-lenovo/downloads/DS101002 |
| Flex 2 Pro-15 (Broadwell) | Not Affected | − | − |
| Flex 2 Pro-15 (Haswell) | Affected | B9CN16WW | http://support.lenovo.com/us/en/products/laptops-and-netbooks/flex-series/flex-2-pro-15-laptop-lenovo/downloads/DS101359 |
| Flex 3 11 | Not Affected | − | − |
| Flex3 1470/1570 HSW/BDW | Not Affected | − | − |
| G40-30/G50-30 | Affected | A7CN43WW | http://support.lenovo.com/us/en/products/laptops-and-netbooks/lenovo-g-series-laptops/g40-30-notebook-lenovo/downloads/DS100921 |
| G40-45/G50-45 | Not Affected | − | − |
| G40-70/G50-70/G70-70 | Affected | 9ACN29WW | G40/50-70: http://support.lenovo.com/us/en/products/laptops-and-netbooks/lenovo-g-series-laptops/g40-70-notebook-lenovo/downloads/DS100522 G70-70: http://support.lenovo.com/us/en/products/laptops-and-netbooks/lenovo-g-series-laptops/g70-70-laptop/downloads/DS101620 |
| G40-75/G50-75 | Not Affected | − | − |
| G40-80/G50-80/G70-80 | Not Affected | − | − |
| G410/G510 | Not Affected | − | − |
| G410s/G510s | Not Affected | − | − |
| K20-80 | Not Affected | − | − |
| K2450 | Not Affected | − | − |
| K4450 | Not Affected | − | − |
| M50-70 | Affected | B3CN15WW | http://support.lenovo.com/us/en/downloads/ds101348 |
| M50-80 | Not Affected | − | − |
| Miix 2 11 | Affected | 97CN37WW | http://support.lenovo.com/us/en/products/tablets/miix-series/miix-2-11-tablet-lenovo/downloads/DS101276 |
| Miix 2 8 | Not Affected | − | − |
| Miix 3-1030 | Not Affected | − | − |
| S20-30 | Affected | ACCN22WW(V2.0) | http://support.lenovo.com/kr/ko/products/laptops-and-netbooks/lenovo-s-series-laptops/lenovo-s20-30-notebook/downloads/ds100552 |
| S310/S410 | Not Affected | − | − |
| S41-70 HSW/BDW | Not Affected | − | − |
| S435/M40-35(YC) Beema | Not Affected | − | − |
| Y40-70 | Not Affected | − | − |
| Y410/510 | Not Affected | − | − |
| Y410P/510P (IdeaPad) | Not Affected | − | − |
| Y430P (IdeaPad) | Not Affected | − | − |
| Y50-70/Y70-70 | Not Affected | − | − |
| Yoga 2 11 (Baytrail-M) | Not Affected | − | − |
| Yoga 2 11 (Haswell) | Not Affected | − | − |
| Yoga 2 13 | Not Affected | − | − |
| Yoga 2 Pro | Not Affected | − | − |
| Yoga 3 14 | Not Affected | − | − |
| Yoga 3 Pro | Not Affected | − | − |
| Z40-70/Z50-70/Z70-70 | Affected | 9BCN29WW | http://support.lenovo.com/us/en/products/laptops-and-netbooks/lenovo-z-series-laptops/lenovo-z40-70/downloads/DS100528 |
| Z40-75/Z50-75 | Not Affected | − | − |
| Z40-80/Z50-80/Z70-80 | Not Affected | − | − |
Lenovo Desktop
Acknowledgements:
Lenovo would like to thank Corey Kallenberg, Xeno Kovah, John Butterworth, and Sam Cornwell of the MITRE Corporation for reporting this vulnerability.
Other information and references:
- CERT Vulnerability Note: VU#758382
- CVE ID: CVE-2014-2961
- http://www.mitre.org/capabilities/cybersecurity/overview/cybersecurity-blog/copernicus-question-your-assumptions-about
Revision History:
|
Revision |
Date |
Description |
| 1.7 | 2015-04-14 | Publish additional fixes |
| 1.6 | 2015-03-17 | Publish additional fixes |
| 1.5 | 2015-03-03 | Publish additional fixes |
| 1.4 | 2014-11-18 | Publish additional fixes |
| 1.3 | 2014-11-07 | Publish additional fixes |
| 1.2 | 2014-11-06 | Publish additional fixes |
| 1.1 | 2014-10-22 | Publish additional fixes |
| 1.0 | 2014-09-27 | Initial release |
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