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From 5bb5b2a901db4c6441fc451f21408be2a9463058 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 9 May 2022 10:07:15 +0200
Subject: [PATCH] nss: return error if seemingly stuck in a cert loop
CVE-2022-27781
Reported-by: Florian Kohnhäuser
Bug: https://curl.se/docs/CVE-2022-27781.html
Closes #8822
Upstream-Status: Backport [https://github.com/curl/curl/commit/5c7da89d404bf59c8dd82a001119a16d18365917]
Signed-off-by: Robert Joslyn <robert.joslyn@redrectangle.org>
---
lib/vtls/nss.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/lib/vtls/nss.c b/lib/vtls/nss.c
index 558e3be..52f2060 100644
--- a/lib/vtls/nss.c
+++ b/lib/vtls/nss.c
@@ -983,6 +983,9 @@ static void display_cert_info(struct Curl_easy *data,
PR_Free(common_name);
}
+/* A number of certs that will never occur in a real server handshake */
+#define TOO_MANY_CERTS 300
+
static CURLcode display_conn_info(struct Curl_easy *data, PRFileDesc *sock)
{
CURLcode result = CURLE_OK;
@@ -1018,6 +1021,11 @@ static CURLcode display_conn_info(struct Curl_easy *data, PRFileDesc *sock)
cert2 = CERT_FindCertIssuer(cert, now, certUsageSSLCA);
while(cert2) {
i++;
+ if(i >= TOO_MANY_CERTS) {
+ CERT_DestroyCertificate(cert2);
+ failf(data, "certificate loop");
+ return CURLE_SSL_CERTPROBLEM;
+ }
if(cert2->isRoot) {
CERT_DestroyCertificate(cert2);
break;
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