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128 lines
5.1 KiB
128 lines
5.1 KiB
From 8780a896543a654e757db1b9396383f9d8095528 Mon Sep 17 00:00:00 2001
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From: Matt Caswell <matt@openssl.org>
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Date: Thu, 6 Jul 2023 16:36:35 +0100
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Subject: [PATCH] Fix DH_check() excessive time with over sized modulus
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The DH_check() function checks numerous aspects of the key or parameters
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that have been supplied. Some of those checks use the supplied modulus
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value even if it is excessively large.
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There is already a maximum DH modulus size (10,000 bits) over which
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OpenSSL will not generate or derive keys. DH_check() will however still
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perform various tests for validity on such a large modulus. We introduce a
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new maximum (32,768) over which DH_check() will just fail.
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An application that calls DH_check() and supplies a key or parameters
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obtained from an untrusted source could be vulnerable to a Denial of
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Service attack.
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The function DH_check() is itself called by a number of other OpenSSL
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functions. An application calling any of those other functions may
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similarly be affected. The other functions affected by this are
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DH_check_ex() and EVP_PKEY_param_check().
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CVE-2023-3446
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Reviewed-by: Paul Dale <pauli@openssl.org>
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Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
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Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
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Reviewed-by: Tomas Mraz <tomas@openssl.org>
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(Merged from https://github.com/openssl/openssl/pull/21452)
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Upstream-Status: Backport [8780a896543a654e757db1b9396383f9d8095528]
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---
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crypto/dh/dh_check.c | 6 ++++++
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crypto/dh/dh_err.c | 3 ++-
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crypto/err/openssl.txt | 3 ++-
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include/openssl/dh.h | 3 +++
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include/openssl/dherr.h | 3 ++-
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5 files changed, 15 insertions(+), 3 deletions(-)
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diff --git a/crypto/dh/dh_check.c b/crypto/dh/dh_check.c
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index 4ac169e75c..e5f9dd5030 100644
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--- a/crypto/dh/dh_check.c
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+++ b/crypto/dh/dh_check.c
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@@ -101,6 +101,12 @@ int DH_check(const DH *dh, int *ret)
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BN_CTX *ctx = NULL;
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BIGNUM *t1 = NULL, *t2 = NULL;
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+ /* Don't do any checks at all with an excessively large modulus */
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+ if (BN_num_bits(dh->p) > OPENSSL_DH_CHECK_MAX_MODULUS_BITS) {
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+ DHerr(DH_F_DH_CHECK, DH_R_MODULUS_TOO_LARGE);
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+ return 0;
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+ }
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+
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if (!DH_check_params(dh, ret))
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return 0;
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diff --git a/crypto/dh/dh_err.c b/crypto/dh/dh_err.c
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index 7285587b4a..92800d3fcc 100644
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--- a/crypto/dh/dh_err.c
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+++ b/crypto/dh/dh_err.c
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@@ -1,6 +1,6 @@
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/*
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* Generated by util/mkerr.pl DO NOT EDIT
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- * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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+ * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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@@ -18,6 +18,7 @@ static const ERR_STRING_DATA DH_str_functs[] = {
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{ERR_PACK(ERR_LIB_DH, DH_F_DHPARAMS_PRINT_FP, 0), "DHparams_print_fp"},
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{ERR_PACK(ERR_LIB_DH, DH_F_DH_BUILTIN_GENPARAMS, 0),
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"dh_builtin_genparams"},
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+ {ERR_PACK(ERR_LIB_DH, DH_F_DH_CHECK, 0), "DH_check"},
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{ERR_PACK(ERR_LIB_DH, DH_F_DH_CHECK_EX, 0), "DH_check_ex"},
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{ERR_PACK(ERR_LIB_DH, DH_F_DH_CHECK_PARAMS_EX, 0), "DH_check_params_ex"},
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{ERR_PACK(ERR_LIB_DH, DH_F_DH_CHECK_PUB_KEY_EX, 0), "DH_check_pub_key_ex"},
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diff --git a/crypto/err/openssl.txt b/crypto/err/openssl.txt
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index 9f91a4a811..c0a3cd720b 100644
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--- a/crypto/err/openssl.txt
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+++ b/crypto/err/openssl.txt
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@@ -402,6 +402,7 @@ CT_F_SCT_SET_VERSION:104:SCT_set_version
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DH_F_COMPUTE_KEY:102:compute_key
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DH_F_DHPARAMS_PRINT_FP:101:DHparams_print_fp
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DH_F_DH_BUILTIN_GENPARAMS:106:dh_builtin_genparams
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+DH_F_DH_CHECK:126:DH_check
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DH_F_DH_CHECK_EX:121:DH_check_ex
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DH_F_DH_CHECK_PARAMS_EX:122:DH_check_params_ex
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DH_F_DH_CHECK_PUB_KEY_EX:123:DH_check_pub_key_ex
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diff --git a/include/openssl/dh.h b/include/openssl/dh.h
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index 3527540cdd..892e31559d 100644
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--- a/include/openssl/dh.h
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+++ b/include/openssl/dh.h
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@@ -29,6 +29,9 @@ extern "C" {
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# ifndef OPENSSL_DH_MAX_MODULUS_BITS
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# define OPENSSL_DH_MAX_MODULUS_BITS 10000
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# endif
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+# ifndef OPENSSL_DH_CHECK_MAX_MODULUS_BITS
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+# define OPENSSL_DH_CHECK_MAX_MODULUS_BITS 32768
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+# endif
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# define OPENSSL_DH_FIPS_MIN_MODULUS_BITS 1024
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# define OPENSSL_DH_FIPS_MIN_MODULUS_BITS_GEN 2048
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diff --git a/include/openssl/dherr.h b/include/openssl/dherr.h
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index 916b3bed0b..528c819856 100644
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--- a/include/openssl/dherr.h
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+++ b/include/openssl/dherr.h
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@@ -1,6 +1,6 @@
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/*
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* Generated by util/mkerr.pl DO NOT EDIT
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- * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
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+ * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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@@ -30,6 +30,7 @@ int ERR_load_DH_strings(void);
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# define DH_F_COMPUTE_KEY 102
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# define DH_F_DHPARAMS_PRINT_FP 101
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# define DH_F_DH_BUILTIN_GENPARAMS 106
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+# define DH_F_DH_CHECK 126
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# define DH_F_DH_CHECK_EX 121
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# define DH_F_DH_CHECK_PARAMS_EX 122
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# define DH_F_DH_CHECK_PUB_KEY_EX 123
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--
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2.41.0
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