CVE-2021-3843: Input Validation
First published: Fri Nov 12 2021(Updated: )
A potential vulnerability in the SMI function to access EEPROM in some ThinkPad models may allow an attacker with local access and elevated privileges to execute arbitrary code.
Credit: psirt@lenovo.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| lenovo ThinkPad yoga 11e 3rd gen firmware | <=1.22 | |
| Lenovo ThinkPad Yoga 11e 3rd Gen | ||
| lenovo ThinkPad yoga 11e 3rd gen firmware | <=1.29 | |
| Lenovo ThinkPad 11e 4th Gen Firmware | <=1.22 | |
| Lenovo ThinkPad 11e 4th Gen i3 | ||
| Lenovo ThinkPad 11e 4th Gen Firmware | <=1.22 | |
| Lenovo ThinkPad 11e 4th Gen with Intel i7 | ||
| Lenovo ThinkPad 11e 4th Gen Firmware | <=1.22 | |
| Lenovo ThinkPad 11e | ||
| Lenovo ThinkPad 11e 4th Gen Firmware | <=1.27 | |
| Lenovo ThinkPad 11e 4th Gen Celeron Firmware | ||
| Lenovo ThinkPad 11e Yoga Gen 6 Firmware | <=1.12 | |
| Lenovo ThinkPad 11e Yoga Gen 6 Firmware | ||
| Lenovo ThinkPad 13 2nd Gen Firmware | <=1.29 | |
| Lenovo ThinkPad 13 2nd Gen Firmware | ||
| Lenovo ThinkPad L13 | <=1.31 | |
| Lenovo ThinkPad L13 | ||
| Lenovo ThinkPad L13 Gen 2 | <=1.11 | |
| Lenovo ThinkPad L13 Gen 2 Firmware | ||
| Lenovo ThinkPad L13 Gen 2 | <=1.08 | |
| Lenovo ThinkPad L13 Yoga Gen 4 Firmware | <=1.31 | |
| Lenovo ThinkPad L13 Yoga Gen 1 | ||
| Lenovo ThinkPad L13 Yoga Gen 2 | <=1.11 | |
| Lenovo 13w Yoga Gen 2 Firmware | ||
| Lenovo ThinkPad L13 Yoga Gen 2 | <=1.08 | |
| Lenovo ThinkPad L14 Gen 1 | <1.15 | |
| Lenovo ThinkPad L14 | ||
| Lenovo Thinkpad L14 Firmware | <1.20.1.17 | |
| Lenovo ThinkPad L14 | ||
| Lenovo ThinkPad L15 Gen 1 Firmware | <1.15 | |
| Lenovo ThinkPad L15 Gen 1 Firmware | ||
| Lenovo ThinkPad L15 | <1.20.1.17 | |
| Lenovo ThinkPad L15 | ||
| Lenovo ThinkPad L380 Firmware | <=1.26 | |
| Lenovo ThinkPad L380 | ||
| Lenovo ThinkPad L380 Yoga Firmware | <=1.26 | |
| Lenovo ThinkPad L380 Yoga Firmware | ||
| Lenovo ThinkPad L390 Yoga Firmware | <=1.35 | |
| Lenovo ThinkPad L390 Yoga Firmware | ||
| Lenovo ThinkPad L390 Yoga Firmware | <=1.35 | |
| Lenovo Thinkpad L390 Firmware | ||
| Lenovo ThinkPad S5 2nd Generation Firmware | <=1.28 | |
| Lenovo ThinkPad S5 2nd Gen Firmware | ||
| Lenovo ThinkPad T460 firmware | <=1.43.1.11 | |
| Lenovo ThinkPad T460 firmware | ||
| Lenovo ThinkPad S2 Yoga Gen 6 Firmware | <=2021-09-30 | |
| Lenovo ThinkPad S2 Yoga Gen 6 Firmware | ||
| Lenovo ThinkPad S2 Yoga Gen 6 Firmware | <=2021-09-30 | |
| Lenovo ThinkPad S2 Yoga Gen 6 Firmware | ||
| Lenovo ThinkPad X12 Detachable Gen 1 Firmware | <1.16 | |
| Lenovo ThinkPad X12 Detachable Gen 1 Firmware | ||
| Lenovo ThinkPad x260 firmware | <=1.47\/1.15 | |
| Lenovo ThinkPad x260 | ||
| Lenovo ThinkPad x380 Yoga Firmware | <=1.34 | |
| Lenovo ThinkPad X380 Yoga | ||
| Lenovo ThinkPad X390 Yoga Firmware | <n2let87w | |
| Lenovo ThinkPad X390 Yoga Firmware | ||
| Lenovo ThinkPad 11e (5th Gen) | <=1.13 | |
| Lenovo ThinkPad 11e (5th Gen) | ||
| Lenovo ThinkPad Yoga 370 Firmware | ||
| Lenovo ThinkPad X1 Fold Gen 1 Firmware | <n2pet50w | |
| Lenovo ThinkPad X1 Fold Gen 1 Firmware |
Remedy
Update system firmware to the version (or newer) indicated for your model in the Product Impact section in LEN-72619.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-3843?
The severity of CVE-2021-3843 is classified as high due to its potential for local code execution.
How do I fix CVE-2021-3843?
To fix CVE-2021-3843, you should update the firmware of affected Lenovo ThinkPad models to the latest version provided by Lenovo.
What models are affected by CVE-2021-3843?
The affected models include various Lenovo ThinkPad 11e, 4th Gen i3/i5/i7, 13 Gen 2, L13, L14, S2 Gen 6, T460, and more.
Can remote attackers exploit CVE-2021-3843?
No, CVE-2021-3843 requires local access and elevated privileges for exploitation.
Is there a workaround for CVE-2021-3843?
Currently, the recommended mitigation for CVE-2021-3843 is to apply the firmware update as there are no known workarounds available.
- agent/type
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/severity
- agent/weakness
- agent/author
- agent/remedy
- agent/last-modified-date
- agent/description
- agent/first-publish-date
- agent/event
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/lenovo
- canonical/lenovo thinkpad yoga 11e 3rd gen firmware
- version/lenovo thinkpad yoga 11e 3rd gen firmware/1.22
- canonical/lenovo thinkpad yoga 11e 3rd gen
- version/lenovo thinkpad yoga 11e 3rd gen firmware/1.29
- canonical/lenovo thinkpad 11e 4th gen firmware
- version/lenovo thinkpad 11e 4th gen firmware/1.22
- canonical/lenovo thinkpad 11e 4th gen i3
- canonical/lenovo thinkpad 11e 4th gen with intel i7
- canonical/lenovo thinkpad 11e
- version/lenovo thinkpad 11e 4th gen firmware/1.27
- canonical/lenovo thinkpad 11e 4th gen celeron firmware
- canonical/lenovo thinkpad 11e yoga gen 6 firmware
- version/lenovo thinkpad 11e yoga gen 6 firmware/1.12
- canonical/lenovo thinkpad 13 2nd gen firmware
- version/lenovo thinkpad 13 2nd gen firmware/1.29
- canonical/lenovo thinkpad l13
- version/lenovo thinkpad l13/1.31
- canonical/lenovo thinkpad l13 gen 2
- version/lenovo thinkpad l13 gen 2/1.11
- canonical/lenovo thinkpad l13 gen 2 firmware
- version/lenovo thinkpad l13 gen 2/1.08
- canonical/lenovo thinkpad l13 yoga gen 4 firmware
- version/lenovo thinkpad l13 yoga gen 4 firmware/1.31
- canonical/lenovo thinkpad l13 yoga gen 1
- canonical/lenovo thinkpad l13 yoga gen 2
- version/lenovo thinkpad l13 yoga gen 2/1.11
- canonical/lenovo 13w yoga gen 2 firmware
- version/lenovo thinkpad l13 yoga gen 2/1.08
- canonical/lenovo thinkpad l14 gen 1
- canonical/lenovo thinkpad l14
- canonical/lenovo thinkpad l14 firmware
- canonical/lenovo thinkpad l15 gen 1 firmware
- canonical/lenovo thinkpad l15
- canonical/lenovo thinkpad l380 firmware
- version/lenovo thinkpad l380 firmware/1.26
- canonical/lenovo thinkpad l380
- canonical/lenovo thinkpad l380 yoga firmware
- version/lenovo thinkpad l380 yoga firmware/1.26
- canonical/lenovo thinkpad l390 yoga firmware
- version/lenovo thinkpad l390 yoga firmware/1.35
- canonical/lenovo thinkpad l390 firmware
- canonical/lenovo thinkpad s5 2nd generation firmware
- version/lenovo thinkpad s5 2nd generation firmware/1.28
- canonical/lenovo thinkpad s5 2nd gen firmware
- canonical/lenovo thinkpad t460 firmware
- version/lenovo thinkpad t460 firmware/1.43.1.11
- canonical/lenovo thinkpad s2 yoga gen 6 firmware
- version/lenovo thinkpad s2 yoga gen 6 firmware/2021-09-30
- canonical/lenovo thinkpad x12 detachable gen 1 firmware
- canonical/lenovo thinkpad x260 firmware
- version/lenovo thinkpad x260 firmware/1.47\/1.15
- canonical/lenovo thinkpad x260
- canonical/lenovo thinkpad x380 yoga firmware
- version/lenovo thinkpad x380 yoga firmware/1.34
- canonical/lenovo thinkpad x380 yoga
- canonical/lenovo thinkpad x390 yoga firmware
- canonical/lenovo thinkpad 11e (5th gen)
- version/lenovo thinkpad 11e (5th gen)/1.13
- canonical/lenovo thinkpad yoga 370 firmware
- canonical/lenovo thinkpad x1 fold gen 1 firmware