fix: restrict decrypt output file permissions to 0600#108
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Cure53 audit finding TUR-02-002: the writeFile() helper used by the decrypt command created output files with 0644 permissions, making decrypted plaintext (private keys, mnemonics) readable by other users on the system. Change the permission mode from 0644 to 0600 (owner read/write only) so that sensitive output files are not world- or group-readable.
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zkharit
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Jul 1, 2026
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Summary
Fixes Cure53 audit finding TUR-02-002 (ENG-2291).
Problem
The
writeFile()helper insrc/cmd/turnkey/pkg/root.gowrote output files with0644permissions. This means any user on the system can read files written by thedecryptcommand, including decrypted private keys and mnemonics.Fix
Change the permission mode from
0644to0600(owner read/write only). This is the only file-write call site in the CLI; no other permissive modes were found.References