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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: A critical authorization flaw in LibreChat's MCP stdio transport. ๐ **Consequences**: Allows arbitrary command execution with **root privileges** inside the container via a single API request.โฆ
๐ก๏ธ **CWE**: CWE-285 (Improper Authorization). ๐ **Flaw**: The MCP stdio transport accepts **arbitrary commands** without proper validation. โ **Root Cause**: Lack of input verification on command execution pathways.
Q3Who is affected? (Versions/Components)
๐ฆ **Product**: LibreChat (by danny-avila). ๐ **Affected Versions**: **v0.8.2-rc2 and earlier**. โ **Fixed**: Versions after v0.8.2-rc2.
Q4What can hackers do? (Privileges/Data)
๐ป **Privileges**: **Root** access within the container. ๐๏ธ **Data**: Full read/write access to container filesystem and processes. ๐ **Scope**: Any authenticated user can exploit this to escalate privileges.
Q5Is exploitation threshold high? (Auth/Config)
๐ **Auth Required**: **Yes**. The attacker must be an **authenticated user**. ๐ถ **Network**: Network-accessible (AV:N). ๐ฏ **Complexity**: Low (AC:L).โฆ
๐ซ **Public Exploit**: No public PoC or wild exploitation code available in the provided data. ๐ **Status**: Referenced via GitHub commit and security advisory (GHSA-cxhj-j78r-p88f).
Q7How to self-check? (Features/Scanning)
๐ **Check**: Verify your LibreChat version. ๐ **Action**: If version < **v0.8.2-rc2**, you are vulnerable. ๐ ๏ธ **Scan**: Look for MCP stdio transport configurations in your deployment.โฆ
โ **Fixed**: Yes. ๐ฆ **Patch**: Upgrade to **LibreChat v0.8.2-rc2 or later**. ๐ **Reference**: See GitHub commit `211b39f` and GHSA advisory for details.
Q9What if no patch? (Workaround)
๐ง **Workaround**: If patching is impossible, **restrict network access** to the API. ๐ **Mitigation**: Ensure only trusted users have authenticated access.โฆ
๐ฅ **Priority**: **CRITICAL**. ๐จ **Urgency**: Immediate action required. ๐ **CVSS**: High severity (H/H/H). โณ **Time**: Patch as soon as possible to prevent root container takeover.