T09 · Insecure Skill Coding Practices
Note
- Location
scripts/warranty_vault.py:60- Finding
Vault File Is Created Without Restrictive Permissions
- Content
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{path}") ``` ### Technical Analysis The `save()` function creates the warranty vault using Python's default `open()` behavior without explicitly setting restrictive file permissions. Consequently, the permissions of a newly created vault depend on the process umask. For example, a typical umask of `022` can result in a mode of `0644`, making the file readable by other local users when its parent directories permit traversal. The vault may contain purchase history, item values, receipt locations, card program names, product serial numbers, registration dates, and free-form notes. Although the application does not inherently collect payment credentials and does not transmit the data externally, this information can disclose a user's possessions and purchasing activity. The function also does not inspect or correct the permissions of an existing vault file. Therefore, a vault that is already accessible to group or other users remains insecure after subsequent updates. ### Attack Path 1. A user runs a modifying command such as `add`, `update`, `remove`, or `meta`. 2. The command invokes `save()` to create or update the JSON vault. 3. The vault is created according to the process umask rather than an explicit owner-only mode. 4. If the resulting permissions and parent-directory permissions permit access, another local account reads the vault. 5. The local account obtains the stored household inventory and purchase metadata. Exploitation requires local system access and sufficient permission to traverse the vault's parent directories. It does not provide remote access or privilege escalation. ### Impact Assessment The issue c ...[truncated 572 chars]- Remediation
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{path}") ``` ]]>