🛡️ Sentinel: [HIGH] Validate audio file uploads using magic bytes#75
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- Modifies `detectAudioFormat` in `server/replit_integrations/audio/client.ts` to support FLAC. - Adds `detectAudioFormat` validation to `/api/audio/generate-with-reference` in `server/routes.ts` to reject unknown file types based on content inspection. - Prevents processing of potentially malicious files disguised as audio. Co-authored-by: Krosebrook <214532761+Krosebrook@users.noreply.github.com>
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Summary of ChangesHello @Krosebrook, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly improves the security posture of audio file uploads by moving from header-based validation to content-based validation using magic bytes. This change ensures that only legitimate audio files are processed, effectively closing a potential vector for malicious content injection and enhancing the overall robustness of the application's file handling mechanisms. Highlights
Changelog
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Code Review
This pull request significantly enhances the security of audio file uploads by implementing magic byte validation, effectively mitigating the risk of malicious file uploads. The addition of FLAC support to the audio format detection is also a valuable improvement. The changes are well-implemented and directly address the described vulnerability.
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| if (detectedFormat === "unknown") { | ||
| return res.status(400).json({ message: "Invalid or unsupported audio format" }); |
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This route still allows audio/aac in the multer filter, but the new detectedFormat === "unknown" check rejects raw AAC/ADTS files because detectAudioFormat does not recognize AAC headers. In practice, clients that were previously able to upload AAC now get a 400 "Invalid or unsupported audio format", so this change introduces a functional regression for a currently whitelisted format.
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| if (detectedFormat === "unknown") { | ||
| return res.status(400).json({ message: "Invalid or unsupported audio format" }); |
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The new guard only rejects unknown, so any file that matches a loose header pattern is now accepted as safe; for example, detectAudioFormat returns "wav" for any RIFF file and "mp4" for any ....ftyp file, which includes non-audio containers. An attacker can still upload non-audio payloads by spoofing an allowed MIME type, so the intended magic-byte hardening is bypassable in this path.
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Pull request overview
This PR enhances file upload security by implementing magic byte validation to prevent malicious file uploads disguised as audio files. The change adds FLAC format support to the audio format detection system and applies this validation to the reference audio upload endpoint.
Changes:
- Added FLAC magic byte detection (0x66 0x4C 0x61 0x43) to the audio format recognition system
- Integrated magic byte validation into the
/api/audio/generate-with-referenceupload handler to verify file content - Updated Sentinel documentation to record this security vulnerability and its mitigation
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| server/routes.ts | Added detectAudioFormat import and magic byte validation check in the reference audio upload handler |
| server/replit_integrations/audio/client.ts | Extended AudioFormat type and detectAudioFormat function to include FLAC format detection |
| .jules/sentinel.md | Documented the insecure file upload vulnerability and prevention strategy |
| return res.status(400).json({ message: "Reference audio file is required" }); | ||
| } | ||
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| // Sentinel: Validate file content using magic bytes to prevent malicious uploads |
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Remove the "Sentinel:" prefix from this comment. The codebase convention is to use simple descriptive comments without branded prefixes. Change to: "Validate file content using magic bytes to prevent malicious uploads"
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1 issue found across 3 files
Prompt for AI agents (all issues)
Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.
<file name="server/routes.ts">
<violation number="1" location="server/routes.ts:1152">
P2: AAC uploads will now fail because the magic-byte detector doesn’t support AAC even though the MIME filter allows audio/aac. Either add AAC detection or remove audio/aac from the allowed list to avoid a regression.</violation>
</file>
Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.
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| // Sentinel: Validate file content using magic bytes to prevent malicious uploads | ||
| const detectedFormat = detectAudioFormat(file.buffer); |
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P2: AAC uploads will now fail because the magic-byte detector doesn’t support AAC even though the MIME filter allows audio/aac. Either add AAC detection or remove audio/aac from the allowed list to avoid a regression.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At server/routes.ts, line 1152:
<comment>AAC uploads will now fail because the magic-byte detector doesn’t support AAC even though the MIME filter allows audio/aac. Either add AAC detection or remove audio/aac from the allowed list to avoid a regression.</comment>
<file context>
@@ -1147,6 +1148,12 @@ Also suggest a fitting title for the song.`;
}
+ // Sentinel: Validate file content using magic bytes to prevent malicious uploads
+ const detectedFormat = detectAudioFormat(file.buffer);
+ if (detectedFormat === "unknown") {
+ return res.status(400).json({ message: "Invalid or unsupported audio format" });
</file context>
Impact: Prevents users from uploading malicious files (e.g., executables, scripts) by verifying the file content matches known audio formats (WAV, MP3, OGG, WebM, MP4, FLAC). This mitigates the risk of Stored XSS or RCE if these files were to be served back or processed incorrectly.
Verification: Added a temporary verification script
verify_flac.ts(deleted after use) which confirmed thatdetectAudioFormatcorrectly identifies FLAC files and rejects random data. Ranpnpm checkto ensure no TypeScript regressions.Changes:
server/replit_integrations/audio/client.tsto include FLAC inAudioFormatand detection logic.server/routes.tsto usedetectAudioFormatin the upload handler.PR created automatically by Jules for task 16234500495571240936 started by @Krosebrook
Summary by cubic
Validates uploaded audio by inspecting file content (magic bytes) to block malicious files disguised as audio. Also adds FLAC detection support.
Bug Fixes
New Features
Written for commit bff4d94. Summary will update on new commits.