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From 8a62fd996cb1c22383ec75b4155d54dec4a1b0ee Mon Sep 17 00:00:00 2001
From: Matt Caswell <matt@openssl.org>
Date: Fri, 7 Jul 2023 14:39:48 +0100
Subject: [PATCH] Add a test for CVE-2023-3446
Confirm that the only errors DH_check() finds with DH parameters with an
excessively long modulus is that the modulus is too large. We should not
be performing time consuming checks using that modulus.
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21451)
(cherry picked from commit ede782b4c8868d1f09c9cd237f82b6f35b7dba8b)
---
test/dhtest.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/test/dhtest.c b/test/dhtest.c
index 7b587f3cfa..f8dd8f3aa7 100644
--- a/test/dhtest.c
+++ b/test/dhtest.c
@@ -73,7 +73,7 @@ static int dh_test(void)
goto err1;
/* check fails, because p is way too small */
- if (!DH_check(dh, &i))
+ if (!TEST_true(DH_check(dh, &i)))
goto err2;
i ^= DH_MODULUS_TOO_SMALL;
if (!TEST_false(i & DH_CHECK_P_NOT_PRIME)
@@ -124,6 +124,17 @@ static int dh_test(void)
/* We'll have a stale error on the queue from the above test so clear it */
ERR_clear_error();
+ /* Modulus of size: dh check max modulus bits + 1 */
+ if (!TEST_true(BN_set_word(p, 1))
+ || !TEST_true(BN_lshift(p, p, OPENSSL_DH_CHECK_MAX_MODULUS_BITS)))
+ goto err3;
+
+ /*
+ * We expect no checks at all for an excessively large modulus
+ */
+ if (!TEST_false(DH_check(dh, &i)))
+ goto err3;
+
/*
* II) key generation
*/
@@ -138,7 +149,7 @@ static int dh_test(void)
goto err3;
/* ... and check whether it is valid */
- if (!DH_check(a, &i))
+ if (!TEST_true(DH_check(a, &i)))
goto err3;
if (!TEST_false(i & DH_CHECK_P_NOT_PRIME)
|| !TEST_false(i & DH_CHECK_P_NOT_SAFE_PRIME)
--
2.27.0
|
