claude-botandClaude Opus 4.8
f333dfd606
ci/woodpecker/pr/pr-review Pipeline is running
The pr-review triage agent reads the attacker-controlled PR diff and writes
triage.json; its Write tool is not path-scoped, so a prompt-injected diff can
make it emit any `model` string. The catalog validation used
`grep -qxF -- "$MODEL"`, and grep -F treats a MULTI-LINE operand as
newline-separated patterns: a value like
"claude-sonnet-5\n--dangerously-skip-permissions" matches on its first line,
passes validation, and -- via the unquoted `${MODEL:+--model $MODEL}` expansion
-- word-splits into an extra argv entry, injecting a CLI flag into the review
agent's own `claude` invocation (defeating its --allowedTools allowlist and Read
sandbox, with CLAUDE_CODE_OAUTH_TOKEN in that process's env).
Removing map_model() (which returned one of three literal ids) is what opened
this; restore the invariant with a single-token guard before the expansion:
`case "$MODEL" in ""|*[!A-Za-z0-9._-]*) MODEL= ;; esac`. Verified it turns the
newline/space/hallucinated payloads into a plain `claude -p` (CLI default) while
still passing real ids. Mirrored the guard in pick-model.sh as defence in depth
(its grep -oE already keeps CHOICE single-line, so it was not exploitable).
Also from the review:
- pr-review.yml: correct the HOMELAB comment -- the fetch-models.sh call is
env -u REVIEW_TOKEN'd, so CLAUDE_CODE_OAUTH_TOKEN (not REVIEW_TOKEN) is what
branch-supplied shell there can see.
- pick-model.sh / triage-prompt.md: stop asking the picker to weigh "cost" the
catalog does not expose; reason from the visible capability signals (context /
max_output / effort|thinking|code_exec) as the scale proxy instead.
- fetch-models.sh: drop 2>/dev/null on curl so its -S error reaches the log.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>