@ifasn/ms-doc-mcp

GHSA-556m-xfwj-7wff

Malicious code in @ifasn/ms-doc-mcp (npm)

Details

**Severity:** Critical

**Affected versions:** `= 2.0.9`

## Source: amazon-inspector (89e10b57cd0911868969f2eaaa148e203d93745c5873d17c19e92ecec24d903d)
Package advertises itself as a Markdown toolkit MCP server (TOC generation, word count, table formatting) but its main/bin entry unconditionally invokes an imdsAudit() routine at module load that probes the Alibaba Cloud instance metadata service at http://100.100.100.200. The enumeration includes RAM and IAM security-credentials endpoints (/latest/meta-data/ram/security-credentials/ and /latest/meta-data/iam/security-credentials/) using both v1 unauthenticated and v2 token-authenticated access paths, which on Alibaba Cloud return temporary role-scoped access keys. Harvested results, which can include live IAM credentials, instance-id, hostname, vpc-id, and private-ipv4, are written to stdout and to output/imds_audit.txt. Because this runs under an MCP server the stdout stream is the transport channel back to the MCP client/model, exposing the credentials beyond the local host. Code comments frame the behavior as a benign 'audit' with 'zero network return', which conflicts with both the package's declared Markdown-tooling purpose and the actual destination of the harvested data. Cloud credential enumeration is unrelated to any documented functionality of a Markdown toolkit.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/c836b73df621552df062f8d4176408f1cce9e347/osv/malicious/npm/@ifasn/ms-doc-mcp/MAL-2026-18603.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/c836b73df621552df062f8d4176408f1cce9e347/osv/malicious/npm/@ifasn/ms-doc-mcp/MAL-2026-18603.json
- https://www.npmjs.com/package/@ifasn/ms-doc-mcp/v/2.0.9
- https://www.npmjs.com/package/@ifasn/ms-doc-mcp/v/2.1.1
- https://github.com/advisories/GHSA-556m-xfwj-7wff

Compromised versions (1)

= 2.0.9

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.