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fix(wrapper): replace mktemp with POSIX-compliant temp dir creation in only-mvnw #418

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fix(wrapper): replace mktemp with POSIX-compliant temp dir creation in only-mvnw #418

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6 changes: 4 additions & 2 deletions maven-wrapper-distribution/src/resources/only-mvnw
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Original file line number Diff line number Diff line change
Expand Up @@ -160,8 +160,10 @@ case "${distributionUrl-}" in
*) die "distributionUrl is not valid, must match *-bin.zip or maven-mvnd-*.zip, but found '${distributionUrl-}'" ;;
esac

# prepare tmp dir
if TMP_DOWNLOAD_DIR="$(mktemp -d)" && [ -d "$TMP_DOWNLOAD_DIR" ]; then
# prepare tmp dir (POSIX-compatible: avoid mktemp which is not available in all shells)
_tmp_base="${TMPDIR:-/tmp}"
TMP_DOWNLOAD_DIR="$_tmp_base/maven_wrapper.$$_$(date +%s)"
if mkdir -p -- "$TMP_DOWNLOAD_DIR" && [ -d "$TMP_DOWNLOAD_DIR" ]; then
Comment on lines +164 to +166

Copilot AI Apr 22, 2026

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date +%s is not specified by POSIX and is missing on some platforms (incl. AIX), so this temp dir name generation can fail or produce non-unique names. Use a POSIX format (e.g., date '+%Y%m%d%H%M%S') and/or a small looped suffix counter to guarantee uniqueness without relying on %s.

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clean() { rm -rf -- "$TMP_DOWNLOAD_DIR"; }
Comment on lines +163 to 167

Copilot AI Apr 22, 2026

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The temp directory path is predictable and mkdir -p will succeed if it already exists, which can lead to reusing a pre-existing directory (DoS) and enables TOCTOU/symlink attacks on files created inside it (e.g., Downloader.java, the downloaded archive). Prefer creating a new directory with mkdir (no -p) in a loop until it succeeds, set a restrictive umask/mode, and consider using mktemp -d when available with a POSIX fallback when it isn’t.

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trap clean HUP INT TERM EXIT
else
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