CVE-2022-28806

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.

• fujitsu lifebook a3510 firmware (< 1.09) • fujitsu lifebook u9310 firmware (< 2.17) • fujitsu lifebook u7511 firmware (< 2.30) • fujitsu lifebook u7411 firmware (< 2.30) • fujitsu lifebook u7311 firmware (< 2.30) • fujitsu lifebook u9311 firmware (<= 2.33) • fujitsu lifebook e5510 firmware (< 2.23) • fujitsu lifebook u7510 firmware (< 2.19) • fujitsu lifebook u7410 firmware (< 2.19) • fujitsu lifebook u7310 firmware (< 2.13) • fujitsu lifebook e459 firmware (< 1.09) • fujitsu lifebook e449 firmware (< 1.09)