CVE-2018-1992

Severity: medium (CVSS 6.4 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-03-21 · updated 2026-06-17
Weakness: CWE-119

Description

The IBM Power 9 OP910, OP920, and FW910 boot firmware's bootloader is responsible for loading and validating the initial boot firmware image that drives the rest of the system's hardware initialization. The bootloader firmware contains a buffer overflow vulnerability such that, if an attacker were able to replace the initial boot firmware image with a very carefully crafted and sufficiently large, malicious replacement, it could cause the bootloader, during the load of that image, to overwrite its own instruction memory and circumvent secure boot protections, install trojans, etc. IBM X-Force ID: 154345.

Affected products

IBM Power System Ac922 (8335-Gtg) Firmware: before op910.30 — fixed in op910.30
IBM Power System Ac922 (8335-Gth) Firmware: before op920.10 — fixed in op920.10
IBM Power System Ac922 (8335-Gtx) Firmware: before op920.10 — fixed in op920.10
IBM Power System H922 (9223-22H) Firmware: before fw910.10 — fixed in fw910.10
IBM Power System H924 (9223-42H) Firmware: before fw910.10 — fixed in fw910.10
IBM Power System L922 (9008-22L) Firmware: before fw910.10 — fixed in fw910.10
IBM Power System Lc921 (9006-12P) Firmware: before op920.10 — fixed in op920.10
IBM Power System Lc922 (9006-22P) Firmware: before op920.10 — fixed in op920.10
IBM Power System S914 (9009-41A) Firmware: before fw910.10 — fixed in fw910.10
IBM Power System S922 (9009-22A) Firmware: before fw910.10 — fixed in fw910.10
IBM Power System S924 (9009-42A) Firmware: before fw910.10 — fixed in fw910.10

How to fix

Upgrade to a fixed version: IBM Power System Ac922 (8335-Gtg) Firmware op910.30; IBM Power System Ac922 (8335-Gth) Firmware op920.10; IBM Power System Ac922 (8335-Gtx) Firmware op920.10; IBM Power System H922 (9223-22H) Firmware fw910.10; IBM Power System H924 (9223-42H) Firmware fw910.10; IBM Power System L922 (9008-22L) Firmware fw910.10; IBM Power System Lc921 (9006-12P) Firmware op920.10; IBM Power System Lc922 (9006-22P) Firmware op920.10; IBM Power System S914 (9009-41A) Firmware fw910.10; IBM Power System S922 (9009-22A) Firmware fw910.10; IBM Power System S924 (9009-42A) Firmware fw910.10. Check the vendor advisory for mitigations.

References

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