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Remove crtl chars from HTTP header (3.0)

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... which fixes #2337
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Dirk 2024-09-03 19:33:09 +02:00
parent 6d714d6b99
commit 27f996d99f
1 changed files with 7 additions and 2 deletions
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testssl.sh
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@ -2252,9 +2252,14 @@ run_http_header() {
# Quit on first empty line to catch 98% of the cases. Next pattern is there because the SEDs tested
# so far seem not to be fine with header containing x0d x0a (CRLF) which is the usual case.
# So we also trigger also on any sign on a single line which is not alphanumeric (plus _)
sed -e '/^$/q' -e '/^[^a-zA-Z_0-9]$/q' $HEADERFILE >$HEADERFILE.tmp
#
# Also we use tr here to remove any crtl chars which the server side offers --> possible security problem
# Only allowed now is LF + CR. See #2337
# awk, see above, doesn't seem to care
sed -e '/^$/q' -e '/^[^a-zA-Z_0-9]$/q' $HEADERFILE | tr -d '\000-\011\013\014\016-\037' >$HEADERFILE.tmp
sed -e '/^$/q' -e '/^[^a-zA-Z_0-9]$/q' $HEADERFILE | tr -d '\000-\010\013\014\016-\037' >$HEADERFILE.tmp
# Now to be more sure we delete from '<' or '{' maybe with a leading blank until the end
sed -e '/^ *<.*$/d' -e '/^ *{.*$/d' $HEADERFILE.tmp >$HEADERFILE
sed -e '/^ *<.*$/d' -e '/^ *{.*$/d' $HEADERFILE.tmp >$HEADERFILE
debugme echo -e "---\n $(< $HEADERFILE) \n---"
HTTP_STATUS_CODE=$(awk '/^HTTP\// { print $2 }' $HEADERFILE 2>>$ERRFILE)