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.
problem types: Gain Privileges
affected:
{
product: Power 9 Systems
vendor: IBM
versions:
status: affected, version: FW910
status: affected, version: OP910
status: affected, version: OP920
}
metrics:
cvssV3_0: [
attackComplexity: HIGH
attackVector: LOCAL
availabilityImpact: HIGH
baseScore: 6.4
baseSeverity: MEDIUM
confidentialityImpact: HIGH
exploitCodeMaturity: UNPROVEN
integrityImpact: HIGH
privilegesRequired: HIGH
remediationLevel: OFFICIAL_FIX
reportConfidence: CONFIRMED
scope: UNCHANGED
temporalScore: 5.6
temporalSeverity: MEDIUM
userInteraction: NONE
vectorString: CVSS:3.0/PR:H/AV:L/S:U/I:H/UI:N/AC:H/A:H/C:H/RC:C/E:U/RL:O
version: 3.0
]