Excessive time spent in DH check/generation with large Q parameter value (CVE-2023-5678)
Resolves: RHEL-15954
This commit is contained in:
Dmitry Belyavskiy
parent
72772f737e
commit
f1d5ccdb6e
143
0130-CVE-2023-5678.patch
Normal file
143
0130-CVE-2023-5678.patch
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@ -0,0 +1,143 @@
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diff --git a/crypto/dh/dh_check.c b/crypto/dh/dh_check.c
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index 7ba2beae7f..e20eb62081 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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@@ -249,6 +249,18 @@ int DH_check_pub_key_ex(const DH *dh, const BIGNUM *pub_key)
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*/
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int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *ret)
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{
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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->params.p) > OPENSSL_DH_CHECK_MAX_MODULUS_BITS) {
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+ ERR_raise(ERR_LIB_DH, DH_R_MODULUS_TOO_LARGE);
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+ *ret = DH_MODULUS_TOO_LARGE | DH_CHECK_PUBKEY_INVALID;
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+ return 0;
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+ }
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+
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+ if (dh->params.q != NULL && BN_ucmp(dh->params.p, dh->params.q) < 0) {
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+ *ret |= DH_CHECK_INVALID_Q_VALUE | DH_CHECK_PUBKEY_INVALID;
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+ return 1;
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+ }
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+
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return ossl_ffc_validate_public_key(&dh->params, pub_key, ret);
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}
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diff --git a/crypto/dh/dh_err.c b/crypto/dh/dh_err.c
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index 4152397426..f76ac0dd14 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 1995-2021 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 Apache License 2.0 (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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@@ -54,6 +54,7 @@ static const ERR_STRING_DATA DH_str_reasons[] = {
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{ERR_PACK(ERR_LIB_DH, 0, DH_R_PARAMETER_ENCODING_ERROR),
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"parameter encoding error"},
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{ERR_PACK(ERR_LIB_DH, 0, DH_R_PEER_KEY_ERROR), "peer key error"},
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+ {ERR_PACK(ERR_LIB_DH, 0, DH_R_Q_TOO_LARGE), "q too large"},
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{ERR_PACK(ERR_LIB_DH, 0, DH_R_SHARED_INFO_ERROR), "shared info error"},
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{ERR_PACK(ERR_LIB_DH, 0, DH_R_UNABLE_TO_CHECK_GENERATOR),
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"unable to check generator"},
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diff --git a/crypto/dh/dh_key.c b/crypto/dh/dh_key.c
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index d84ea99241..afc49f5cdc 100644
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--- a/crypto/dh/dh_key.c
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+++ b/crypto/dh/dh_key.c
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@@ -49,6 +49,12 @@ int ossl_dh_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
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goto err;
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}
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+ if (dh->params.q != NULL
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+ && BN_num_bits(dh->params.q) > OPENSSL_DH_MAX_MODULUS_BITS) {
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+ ERR_raise(ERR_LIB_DH, DH_R_Q_TOO_LARGE);
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+ goto err;
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+ }
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+
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if (BN_num_bits(dh->params.p) < DH_MIN_MODULUS_BITS) {
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ERR_raise(ERR_LIB_DH, DH_R_MODULUS_TOO_SMALL);
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return 0;
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@@ -267,6 +273,12 @@ static int generate_key(DH *dh)
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return 0;
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}
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+ if (dh->params.q != NULL
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+ && BN_num_bits(dh->params.q) > OPENSSL_DH_MAX_MODULUS_BITS) {
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+ ERR_raise(ERR_LIB_DH, DH_R_Q_TOO_LARGE);
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+ return 0;
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+ }
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+
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if (BN_num_bits(dh->params.p) < DH_MIN_MODULUS_BITS) {
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ERR_raise(ERR_LIB_DH, DH_R_MODULUS_TOO_SMALL);
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return 0;
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diff --git a/crypto/err/openssl.txt b/crypto/err/openssl.txt
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index e51504b7ab..36de321b74 100644
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--- a/crypto/err/openssl.txt
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+++ b/crypto/err/openssl.txt
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@@ -500,6 +500,7 @@ DH_R_NO_PARAMETERS_SET:107:no parameters set
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DH_R_NO_PRIVATE_VALUE:100:no private value
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DH_R_PARAMETER_ENCODING_ERROR:105:parameter encoding error
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DH_R_PEER_KEY_ERROR:111:peer key error
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+DH_R_Q_TOO_LARGE:130:q too large
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DH_R_SHARED_INFO_ERROR:113:shared info error
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DH_R_UNABLE_TO_CHECK_GENERATOR:121:unable to check generator
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DSA_R_BAD_FFC_PARAMETERS:114:bad ffc parameters
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diff --git a/include/crypto/dherr.h b/include/crypto/dherr.h
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index bb24d131eb..519327f795 100644
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--- a/include/crypto/dherr.h
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+++ b/include/crypto/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 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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+ * Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (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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diff --git a/include/openssl/dh.h b/include/openssl/dh.h
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index 6533260f20..50e0cf54be 100644
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--- a/include/openssl/dh.h
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+++ b/include/openssl/dh.h
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@@ -141,7 +141,7 @@ DECLARE_ASN1_ITEM(DHparams)
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# define DH_GENERATOR_3 3
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# define DH_GENERATOR_5 5
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-/* DH_check error codes */
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+/* DH_check error codes, some of them shared with DH_check_pub_key */
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/*
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* NB: These values must align with the equivalently named macros in
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* internal/ffc.h.
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@@ -151,10 +151,10 @@ DECLARE_ASN1_ITEM(DHparams)
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# define DH_UNABLE_TO_CHECK_GENERATOR 0x04
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# define DH_NOT_SUITABLE_GENERATOR 0x08
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# define DH_CHECK_Q_NOT_PRIME 0x10
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-# define DH_CHECK_INVALID_Q_VALUE 0x20
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+# define DH_CHECK_INVALID_Q_VALUE 0x20 /* +DH_check_pub_key */
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# define DH_CHECK_INVALID_J_VALUE 0x40
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# define DH_MODULUS_TOO_SMALL 0x80
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-# define DH_MODULUS_TOO_LARGE 0x100
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+# define DH_MODULUS_TOO_LARGE 0x100 /* +DH_check_pub_key */
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/* DH_check_pub_key error codes */
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# define DH_CHECK_PUBKEY_TOO_SMALL 0x01
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diff --git a/include/openssl/dherr.h b/include/openssl/dherr.h
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index 5d2a762a96..074a70145f 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 1995-2021 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 Apache License 2.0 (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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@@ -50,6 +50,7 @@
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# define DH_R_NO_PRIVATE_VALUE 100
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# define DH_R_PARAMETER_ENCODING_ERROR 105
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# define DH_R_PEER_KEY_ERROR 111
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+# define DH_R_Q_TOO_LARGE 130
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# define DH_R_SHARED_INFO_ERROR 113
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# define DH_R_UNABLE_TO_CHECK_GENERATOR 121
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@ -203,6 +203,7 @@ Patch127: 0127-CVE-2023-3817.patch
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Patch128: 0128-CVE-2023-5363.patch
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# https://github.com/openssl/openssl/pull/22403
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Patch129: 0129-rsa-Add-SP800-56Br2-6.4.1.2.1-3.c-check.patch
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Patch130: 0130-CVE-2023-5678.patch
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License: ASL 2.0
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URL: http://www.openssl.org/
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@ -555,6 +556,8 @@ ln -s /etc/crypto-policies/back-ends/openssl_fips.config $RPM_BUILD_ROOT%{_sysco
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Resolves: RHEL-14083
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- Add missing ECDH Public Key Check in FIPS mode
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Resolves: RHEL-15990
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- Excessive time spent in DH check/generation with large Q parameter value (CVE-2023-5678)
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Resolves: RHEL-15954
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* Wed Jul 12 2023 Dmitry Belyavskiy <dbelyavs@redhat.com> - 1:3.0.7-24
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- Make FIPS module configuration more crypto-policies friendly
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