CVE-2022-28806
Description
An issue was discovered on certain Fujitsu LIEFBOOK devices (A3510, U9310, U7511/U7411/U7311, U9311, E5510/E5410, U7510/U7410/U7310, E459/E449) with BIOS versions before v1.09 (A3510), v2.17 (U9310), v2.30 (U7511/U7411/U7311), v2.33 (U9311), v2.23 (E5510), v2.19 (U7510/U7410), v2.13 (U7310), and v1.09 (E459/E449). The FjGabiFlashCoreAbstractionSmm driver registers a Software System Management Interrupt (SWSMI) handler that is not sufficiently validated to ensure that the CommBuffer (or any other communication buffer's nested contents) are not pointing to SMRAM contents. A potential attacker can therefore write fixed data to SMRAM, which could lead to data corruption inside this memory (e.g., change the SMI handler's code or modify SMRAM map structures to break input pointer validation for other SMI handlers). Thus, the attacker could elevate privileges from ring 0 to ring -2 and execute arbitrary code in SMM.
How to fix
- fujitsu lifebook_a3510_firmware1.09 or later
- fujitsu lifebook_u9310_firmware2.17 or later
- fujitsu lifebook_u7511_firmware2.30 or later
- fujitsu lifebook_u7411_firmware2.30 or later
- fujitsu lifebook_u7311_firmware2.30 or later
- fujitsu lifebook_e5510_firmware2.23 or later
- fujitsu lifebook_u7510_firmware2.19 or later
- fujitsu lifebook_u7410_firmware2.19 or later
- fujitsu lifebook_u7310_firmware2.13 or later
- fujitsu lifebook_e459_firmware1.09 or later
- fujitsu lifebook_e449_firmware1.09 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| fujitsu lifebook_a3510_firmware | v < 1.09 | 1.09 |
| fujitsu lifebook_u9310_firmware | v < 2.17 | 2.17 |
| fujitsu lifebook_u7511_firmware | v < 2.30 | 2.30 |
| fujitsu lifebook_u7411_firmware | v < 2.30 | 2.30 |
| fujitsu lifebook_u7311_firmware | v < 2.30 | 2.30 |
| fujitsu lifebook_u9311_firmware | v ≤ 2.33 | — |
| fujitsu lifebook_e5510_firmware | v < 2.23 | 2.23 |
| fujitsu lifebook_u7510_firmware | v < 2.19 | 2.19 |
| fujitsu lifebook_u7410_firmware | v < 2.19 | 2.19 |
| fujitsu lifebook_u7310_firmware | v < 2.13 | 2.13 |
| fujitsu lifebook_e459_firmware | v < 1.09 | 1.09 |
| fujitsu lifebook_e449_firmware | v < 1.09 | 1.09 |
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