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  <div class="kicker">Methodology</div>
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  <h1>sequoia-pgp hunt, iteration 1 (recon)</h1>
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<p>Time: 2026-04-17 ~08:18 UTC
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Target: sequoia-pgp (assumed YWH STF, confirm against intel file when desktop scrape lands)
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Source: gitlab.com/sequoia-pgp/sequoia, shallow clone at source/sequoia/
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Latest commit: c67789b (today, 2026-04-17 09:45 +0200)
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Latest openpgp tag: openpgp/v2.2.0</p>
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<h2>Why this target</h2>
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<ul>
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<li>Active project, fresh upstream activity today.</li>
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<li>Multiple historical RUSTSEC advisories on <code>sequoia-openpgp</code> (DoS class).</li>
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<li>Parser-heavy crate (openpgp/src/parse/, ~7400 LoC of parsers).</li>
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<li>Adjacent to openpgpjs hunt, variant cross-pollination opportunity.</li>
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</ul>
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<h2>Historical RUSTSEC anchors (variant seeds)</h2>
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<h3>RUSTSEC-2024-0345 (CVE-2024-58261)</h3>
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<ul>
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<li><code>cert::raw::RawCertParser</code> infinite loop on unsupported cert version.</li>
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<li>Root cause class: parser does not advance input stream when encountering an
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  unhandled tag/version, so the next iteration sees the same bytes.</li>
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<li><strong>Variant probe</strong>: enumerate all parser dispatch tables (packet body, subpacket,
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  signature subtype, key type) and check each fall-through arm advances <code>cursor</code>.</li>
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</ul>
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<h3>RUSTSEC-2023-0038 (CVE-2023-53160)</h3>
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<ul>
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<li>&ldquo;Several bugs&rdquo; of attacker-controlled OOB array index → panic (DoS).</li>
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<li>Root cause class: unchecked <code>slice[idx]</code> after parsing a length field.</li>
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<li><strong>Variant probe</strong>: grep for <code>\[\w+ as usize\]</code> and indexed access patterns
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  in mpis.rs, packet/<em>, parse/</em>, verify each is preceded by a bounds check
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  derived from the same input.</li>
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</ul>
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<h2>Parser surface map (openpgp/src/parse/)</h2>
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<table>
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<thead>
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<tr>
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<th>File</th>
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<th>LoC</th>
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<th>Role</th>
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<th>Priority</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>stream.rs</td>
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<td>4321</td>
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<td>verification / decryption / streaming primitives</td>
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<td><strong>P1</strong></td>
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</tr>
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<tr>
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<td>mpis.rs</td>
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<td>666</td>
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<td>RSA/DSA/ECDSA/EdDSA MPI parsing</td>
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<td>P2</td>
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</tr>
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<tr>
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<td>hashed_reader.rs</td>
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<td>644</td>
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<td>sig hash input wrapper</td>
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<td>P2</td>
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</tr>
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<tr>
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<td>packet_pile_parser.rs</td>
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<td>551</td>
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<td>packet collection</td>
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<td>P2</td>
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</tr>
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<tr>
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<td>packet_parser_builder.rs</td>
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<td>525</td>
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<td>parser config / dispatch</td>
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<td>P3</td>
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</tr>
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<tr>
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<td>partial_body.rs</td>
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<td>426</td>
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<td>partial body length encoding</td>
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<td><strong>P1</strong> (CVE-history)</td>
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</tr>
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<tr>
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<td>map.rs</td>
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<td>280</td>
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<td>metadata</td>
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<td>P3</td>
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</tr>
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</tbody>
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</table>
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<h2>Cross-project variant, CVE-2025-47934 analog</h2>
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<p>openpgpjs <code>message.verify()</code> mutated the packet list while computing signatures
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against the pre-mutation window, so <code>result.data</code> could come from a different
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window than the verified signature. Same class to look for in
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<code>sequoia/openpgp/src/parse/stream.rs</code> Verifier / DecryptorBuilder paths:
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does the verified-data window equal the data delivered to the caller?</p>
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<h2>Next iteration plan</h2>
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<ol>
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<li>Read parse/stream.rs Verifier::verify and DecryptorWithMDC paths.</li>
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<li>Map data-flow: input bytes → hash context → signature check → data delivered.</li>
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<li>Compare with the openpgpjs anti-pattern.</li>
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<li>If clean, pivot to RawCertParser dispatch tables for variant of -0345.</li>
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</ol>
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<hr><p style="color:var(--faint);font-size:12.5px;font-family:ui-monospace,Menlo,monospace">Source &middot; github.com/zionboggan/security-research-notebook &middot; methodology/sequoia-pgp-variant-hunting-1.md</p>
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  <div class="links"><a href="/">Portfolio</a><a href="https://www.linkedin.com/in/zion-boggan">LinkedIn</a><a href="/security-research-notebook/">Notebook</a><a href="mailto:zionboggan0@gmail.com">Email</a></div>
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  <div class="note">Coordinated-disclosure research. Findings appear here only after the program's disclosure window closed, the patch shipped, or a CVE was published. No customer data was accessed.</div>
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