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Crudely detect exponential backoff as a mitigation

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Emmanuel Fusté
2023-11-28 14:41:25 +01:00
parent 1a9a486474
commit 429db592e2
1 changed files with 11 additions and 1 deletions
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12
testssl.sh
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@@ -17068,13 +17068,23 @@ run_renego() {
else
(for ((i=0; i < ssl_reneg_attempts; i++ )); do echo R; sleep 1; done) | \
$OPENSSL s_client $(s_client_options "$proto $legacycmd $STARTTLS $BUGS -connect $NODEIP:$PORT $PROXY $SNI") >$TMPFILE 2>>$ERRFILE
case $? in
tmp_result=$?
# If we are here, we have done two successfull renegotiation (-2) and do the loop
loop_reneg=$(($(grep -a '^RENEGOTIATING' $ERRFILE | wc -l)-2))
# If we got less than 2/3 successfull attemps during the loop with 1s pause, we are in precence of exponential backoff.
if [[ $loop_reneg -le $(($ssl_reneg_attempts*2/3)) ]]; then
tmp_result=2
fi
case $tmp_result in
0) pr_svrty_high "VULNERABLE (NOT ok)"; outln ", DoS threat ($ssl_reneg_attempts attempts)"
fileout "$jsonID" "HIGH" "VULNERABLE, DoS threat" "$cve" "$cwe" "$hint"
;;
1) pr_svrty_good "not vulnerable (OK)"; outln " -- mitigated (disconnect within $ssl_reneg_attempts)"
fileout "$jsonID" "OK" "not vulnerable, mitigated" "$cve" "$cwe"
;;
2) pr_svrty_good "not vulnerable (OK)"; outln " -- mitigated ($loop_reneg successful reneg within ${ssl_reneg_attempts} in ${ssl_reneg_attempts}s)"
fileout "$jsonID" "OK" "not vulnerable, mitigated" "$cve" "$cwe"
;;
*) prln_warning "FIXME (bug): $sec_client_renego ($ssl_reneg_attempts tries)"
fileout "$jsonID" "DEBUG" "FIXME (bug $ssl_reneg_attempts tries) $sec_client_renego" "$cve" "$cwe"
ret=1