Merge #13479: contrib: Fix CVE-2018-12356 by hardening the regex

9e2e562 Fix CVE-2018-12356 by hardening the regex. (Loganaden Velvindron)

Pull request description:

  Detailed write-up here:
  https://neopg.io/blog/pass-signature-spoof/

Tree-SHA512: 2020474ff4c7b5e7f1bea932c63da62aca48d3dc6dcd04507afefad6c40f2977ed2d2916defe2e8e7936a2d498125c578077870147954a7af9b29b823cbb0b10

Author: laanwj

contrib/verify-commits/gpg.sh

@@ -57,7 +57,7 @@ if ! $VALID; then
 	exit 1
 fi
 if $VALID && $REVSIG; then
-	printf '%s\n' "$INPUT" | gpg --trust-model always "$@" 2>/dev/null | grep "\[GNUPG:\] \(NEWSIG\|SIG_ID\|VALIDSIG\)"
+	printf '%s\n' "$INPUT" | gpg --trust-model always "$@" 2>/dev/null | grep "^\[GNUPG:\] \(NEWSIG\|SIG_ID\|VALIDSIG\)"
 	echo "$GOODREVSIG"
 else
 	printf '%s\n' "$INPUT" | gpg --trust-model always "$@" 2>/dev/null