Repmix Arbitrary File Read Vulnerability Fix in read/grep_repmix_output

Vulnerability Overview This vulnerability involves an incorrect execution of the boundary check in the and functions, allowing attackers to bypass this boundary and read arbitrary files from the local file system. Specifically, when content is served (in and ), the boundary check remains effective not only at the time of attachment but also even if the file changes after attachment (due to TOCTOU / symbolic link swapping), and it is always applied until the actual return. Scope of Impact Affected Functions: and Impact Scenario: Incorrect execution of the boundary check when content is served Potential Risk: Attackers can read arbitrary files from the local file system, potentially leading to the leakage of sensitive information Remediation Plan 1. Decision (registry/flag): Mark the attached source registry entry as , so that only untrusted attachment outputs are scanned, keeping trusted package combinations/package remote repository outputs (already filtered during packaging) unaffected. 2. Decision (Validity at attachment time): Reject inputs unrelated to zero extractable files. Legitimate output can contain zero files (empty repository, all filtered output files are falsy), and forging 200k with file keys passed the check, so it was abandoned to match the boundary of . 3. Testing (grep): Cover scanning when serving in and (prevent scanning flag content, skip non-attachment outputs) and attach tags their outputs as serving-time scanning. POC Code ```typescript // tests/mcp/tools/attachPackedOutputTool.test.ts +25 -0 @@ -97,12 +97,14 @@ describe('AttachPackedOutputTool', () => { testFilePath, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, undefined, und

Goal Reached Thanks to every supporter — we hit 100%!

Repmix Arbitrary File Read Vulnerability Fix in read/grep_repmix_output

More from this source