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Advisories

Phison PS3111-S11 Controller Firmware Signature Verification Bypass

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severity
critical
date
Affecting

  • PS3111-S11 Controller Firmware <= SBFQT1.3

CWE
  • CWE-347 Improper Verification of Cryptographic Signature
CVSS
9.3
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Credit
Michael Herbert
Description
Phison PS3111-S11 controller firmware verifies RSA signatures using a public modulus embedded within the firmware image itself rather than anchored in immutable storage. Attackers can generate arbitrary RSA key pairs, sign modified firmware with the private key, embed the matching modulus in the signature segment, and the controller accepts the tampered firmware as valid.

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