T09 · Insecure Skill Coding Practices
- Location
scripts/script.sh:3- Finding
Plaintext Financial Records Created Without Enforced Access Controls
- Content
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Vulnerability Details
File Location:
scripts/script.sh, lines 3-8
Vulnerability Type: Insecure storage permissions for sensitive local data
Risk Level: MediumVulnerable Code:
bash # Powered by BytesAgain | bytesagain.com | hello@bytesagain.com set -euo pipefail DATA_DIR="${HOME}/.local/share/crypto-defi" mkdir -p "$DATA_DIR" _log() { echo "$(date '+%m-%d %H:%M') $1: $2" >> "$DATA_DIR/history.log"; }Technical Analysis
The Skill stores portfolio balances, DeFi positions, alerts, price observations, whale activity, and operation history in plaintext files beneath
~/.local/share/crypto-defi/. It creates the storage directory withmkdir -pand creates log files through shell redirection, but it neither establishes a restrictiveumasknor explicitly applies secure permission modes.Consequently, permissions depend on the invoking process's environment. Under a commonly used
022umask, newly created directories are typically mode755and log files are typically mode644. This may permit other local accounts to traverse the directory and read the files. Existing directories and files are also not checked or repaired if their permissions are insecure.The vulnerability does not independently provide remote access, code execution, privilege escalation, or access beyond the invoking user's files. Exploitation requires a separate local account or process that can access files according to their effective permissions.
Attack Path
- A user invokes commands such as
crypto-defi portfolio,track,alert, orwhale-watchand supplies sensitive financial information. - The script creates
~/.local/share/crypto-defiand its log files using the caller's current umask. - If that umask permits group or world access, the resulting directory and files receive overly broad permissions.
- Another local user or process enumerates or directly reads
~/.local/share/crypto-defi/*.log...[truncated 764 chars]
- A user invokes commands such as
- Remediation
View remediation
Remediation Suggestions
-
Establish a restrictive file-creation mask before creating any data:
bash umask 077 -
Create the data directory with an explicit owner-only mode:
bash DATA_DIR="${HOME}/.local/share/crypto-defi" mkdir -p -m 700 -- "$DATA_DIR" chmod 700 -- "$DATA_DIR" -
Ensure all existing and newly generated logs and exports are owner-readable and owner-writable only:
bash find "$DATA_DIR" -maxdepth 1 -type f -exec chmod 600 -- {} + -
Validate that
DATA_DIRis owned by the invoking user and reject unsafe ownership or symbolic-link configurations before writing sensitive information. -
Clearly warn users that records are stored locally in plaintext. If the data is expected to include highly sensitive holdings or transaction details, consider optional encryption at rest using a well-reviewed platform key store or encryption utility.
-
Add automated tests that execute the script under permissive umasks and verify that the resulting directory is mode
700and all data files are mode600.
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