Local privilege escalation via untrusted RSA key
Published Sep 1, 2025 · Updated Sep 1, 2025
Certificate validation in Unisoc BootROM on SC9863A, T310, T610, and T618 allows local users to gain BootROM privileges. The Certificate Type 0 branch hashes the supplied RSA public key but never compares that hash with the eFuse-anchored root-key hash, so an attacker-controlled key reaches signature processing. Exploitation requires local low-privileged access or brief physical access and enables persistent compromise of the secure boot chain.
Summary
What happened
Certificate validation in Unisoc BootROM on SC9863A, T310, T610, and T618 allows local users to gain BootROM privileges. The Certificate Type 0 branch hashes the supplied RSA public key but never compares that hash with the eFuse-anchored root-key hash, so an attacker-controlled key reaches signature processing. Exploitation requires local low-privileged access or brief physical access and enables persistent compromise of the secure boot chain.
The record
- CVE
- CVE-2022-38691
- Published
- Sep 1, 2025
- Updated
- Sep 1, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-250, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 1, 2025CVE publishedPublication date reported by the CVE source.
- Sep 1, 2025Record updatedLatest update available in the CVE record.
Exploitability
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Published CVSS scores
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Attacks
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Technologies
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