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Remove crtl chars from HTTP header

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... which fixes #2337
This commit is contained in:
Dirk
2024-09-03 19:24:46 +02:00
parent e59a0f202f
commit 2b36b33112
1 changed files with 7 additions and 3 deletions
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8
testssl.sh
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@@ -2511,7 +2511,11 @@ 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
# 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
debugme echo -e "---\n $(< $HEADERFILE) \n---"
@@ -2588,7 +2592,7 @@ match_ipv4_httpheader() {
# Exclude some headers as they are mistakenly identified as ipv4 address. Issues #158, #323.
# Also facebook used to have a CSP rule for 127.0.0.1
headers="$(grep -Evai "$excluded_header" $HEADERFILE)"
headers="$(grep -Evai "$excluded_header" $HEADERFILE 2>/dev/null)"
if [[ "$headers" =~ $ipv4address ]]; then
pr_bold " IPv4 address in header "
while read line; do