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Add the comments to address security problems in the Pkcs7Verify Protocol per UEFI 2.7 updates. The Pkcs7Verifier function VerifySignature() has problematic use cases where it might be used to unwittingly bypass security checks. The specific problem is that if the supplied hash is a different algorithm from the blacklist hash, the hash will be approved even if it should have been denied. The added comments place a strong warning about the problem. It is possible to use the protocol reliably, either by agreeing a hash to use for all time (like sha256) or by looping over all supported hashes when using the protocol. Cc: Chao Zhang <chao.b.zhang@intel.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Qin Long <qin.long@intel.com> Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>
EDK II Project
A modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications from www.uefi.org.
Contributions to the EDK II open source project are covered by the TianoCore Contribution Agreement 1.1
The majority of the content in the EDK II open source project uses a BSD 2-Clause License. The EDK II open source project contains the following components that are covered by additional licenses:
- AppPkg/Applications/Python/Python-2.7.2/Tools/pybench
- AppPkg/Applications/Python/Python-2.7.2
- AppPkg/Applications/Python/Python-2.7.10
- BaseTools/Source/C/BrotliCompress
- MdeModulePkg/Library/BrotliCustomDecompressLib
- OvmfPkg
- CryptoPkg/Library/OpensslLib/openssl
The EDK II Project is composed of packages. The maintainers for each package are listed in Maintainers.txt.