From f1d5ccdb6e67102a96b1efe1ae5e5c33d6f887a8 Mon Sep 17 00:00:00 2001 From: Dmitry Belyavskiy Date: Wed, 8 Nov 2023 12:08:38 +0100 Subject: [PATCH] Excessive time spent in DH check/generation with large Q parameter value (CVE-2023-5678) Resolves: RHEL-15954 --- 0130-CVE-2023-5678.patch | 143 +++++++++++++++++++++++++++++++++++++++ openssl.spec | 3 + 2 files changed, 146 insertions(+) create mode 100644 0130-CVE-2023-5678.patch diff --git a/0130-CVE-2023-5678.patch b/0130-CVE-2023-5678.patch new file mode 100644 index 0000000..aa98d3b --- /dev/null +++ b/0130-CVE-2023-5678.patch @@ -0,0 +1,143 @@ +diff --git a/crypto/dh/dh_check.c b/crypto/dh/dh_check.c +index 7ba2beae7f..e20eb62081 100644 +--- a/crypto/dh/dh_check.c ++++ b/crypto/dh/dh_check.c +@@ -249,6 +249,18 @@ int DH_check_pub_key_ex(const DH *dh, const BIGNUM *pub_key) + */ + int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *ret) + { ++ /* Don't do any checks at all with an excessively large modulus */ ++ if (BN_num_bits(dh->params.p) > OPENSSL_DH_CHECK_MAX_MODULUS_BITS) { ++ ERR_raise(ERR_LIB_DH, DH_R_MODULUS_TOO_LARGE); ++ *ret = DH_MODULUS_TOO_LARGE | DH_CHECK_PUBKEY_INVALID; ++ return 0; ++ } ++ ++ if (dh->params.q != NULL && BN_ucmp(dh->params.p, dh->params.q) < 0) { ++ *ret |= DH_CHECK_INVALID_Q_VALUE | DH_CHECK_PUBKEY_INVALID; ++ return 1; ++ } ++ + return ossl_ffc_validate_public_key(&dh->params, pub_key, ret); + } + +diff --git a/crypto/dh/dh_err.c b/crypto/dh/dh_err.c +index 4152397426..f76ac0dd14 100644 +--- a/crypto/dh/dh_err.c ++++ b/crypto/dh/dh_err.c +@@ -1,6 +1,6 @@ + /* + * Generated by util/mkerr.pl DO NOT EDIT +- * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved. ++ * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the Apache License 2.0 (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy +@@ -54,6 +54,7 @@ static const ERR_STRING_DATA DH_str_reasons[] = { + {ERR_PACK(ERR_LIB_DH, 0, DH_R_PARAMETER_ENCODING_ERROR), + "parameter encoding error"}, + {ERR_PACK(ERR_LIB_DH, 0, DH_R_PEER_KEY_ERROR), "peer key error"}, ++ {ERR_PACK(ERR_LIB_DH, 0, DH_R_Q_TOO_LARGE), "q too large"}, + {ERR_PACK(ERR_LIB_DH, 0, DH_R_SHARED_INFO_ERROR), "shared info error"}, + {ERR_PACK(ERR_LIB_DH, 0, DH_R_UNABLE_TO_CHECK_GENERATOR), + "unable to check generator"}, +diff --git a/crypto/dh/dh_key.c b/crypto/dh/dh_key.c +index d84ea99241..afc49f5cdc 100644 +--- a/crypto/dh/dh_key.c ++++ b/crypto/dh/dh_key.c +@@ -49,6 +49,12 @@ int ossl_dh_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh) + goto err; + } + ++ if (dh->params.q != NULL ++ && BN_num_bits(dh->params.q) > OPENSSL_DH_MAX_MODULUS_BITS) { ++ ERR_raise(ERR_LIB_DH, DH_R_Q_TOO_LARGE); ++ goto err; ++ } ++ + if (BN_num_bits(dh->params.p) < DH_MIN_MODULUS_BITS) { + ERR_raise(ERR_LIB_DH, DH_R_MODULUS_TOO_SMALL); + return 0; +@@ -267,6 +273,12 @@ static int generate_key(DH *dh) + return 0; + } + ++ if (dh->params.q != NULL ++ && BN_num_bits(dh->params.q) > OPENSSL_DH_MAX_MODULUS_BITS) { ++ ERR_raise(ERR_LIB_DH, DH_R_Q_TOO_LARGE); ++ return 0; ++ } ++ + if (BN_num_bits(dh->params.p) < DH_MIN_MODULUS_BITS) { + ERR_raise(ERR_LIB_DH, DH_R_MODULUS_TOO_SMALL); + return 0; +diff --git a/crypto/err/openssl.txt b/crypto/err/openssl.txt +index e51504b7ab..36de321b74 100644 +--- a/crypto/err/openssl.txt ++++ b/crypto/err/openssl.txt +@@ -500,6 +500,7 @@ DH_R_NO_PARAMETERS_SET:107:no parameters set + DH_R_NO_PRIVATE_VALUE:100:no private value + DH_R_PARAMETER_ENCODING_ERROR:105:parameter encoding error + DH_R_PEER_KEY_ERROR:111:peer key error ++DH_R_Q_TOO_LARGE:130:q too large + DH_R_SHARED_INFO_ERROR:113:shared info error + DH_R_UNABLE_TO_CHECK_GENERATOR:121:unable to check generator + DSA_R_BAD_FFC_PARAMETERS:114:bad ffc parameters +diff --git a/include/crypto/dherr.h b/include/crypto/dherr.h +index bb24d131eb..519327f795 100644 +--- a/include/crypto/dherr.h ++++ b/include/crypto/dherr.h +@@ -1,6 +1,6 @@ + /* + * Generated by util/mkerr.pl DO NOT EDIT +- * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved. ++ * Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the Apache License 2.0 (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy +diff --git a/include/openssl/dh.h b/include/openssl/dh.h +index 6533260f20..50e0cf54be 100644 +--- a/include/openssl/dh.h ++++ b/include/openssl/dh.h +@@ -141,7 +141,7 @@ DECLARE_ASN1_ITEM(DHparams) + # define DH_GENERATOR_3 3 + # define DH_GENERATOR_5 5 + +-/* DH_check error codes */ ++/* DH_check error codes, some of them shared with DH_check_pub_key */ + /* + * NB: These values must align with the equivalently named macros in + * internal/ffc.h. +@@ -151,10 +151,10 @@ DECLARE_ASN1_ITEM(DHparams) + # define DH_UNABLE_TO_CHECK_GENERATOR 0x04 + # define DH_NOT_SUITABLE_GENERATOR 0x08 + # define DH_CHECK_Q_NOT_PRIME 0x10 +-# define DH_CHECK_INVALID_Q_VALUE 0x20 ++# define DH_CHECK_INVALID_Q_VALUE 0x20 /* +DH_check_pub_key */ + # define DH_CHECK_INVALID_J_VALUE 0x40 + # define DH_MODULUS_TOO_SMALL 0x80 +-# define DH_MODULUS_TOO_LARGE 0x100 ++# define DH_MODULUS_TOO_LARGE 0x100 /* +DH_check_pub_key */ + + /* DH_check_pub_key error codes */ + # define DH_CHECK_PUBKEY_TOO_SMALL 0x01 +diff --git a/include/openssl/dherr.h b/include/openssl/dherr.h +index 5d2a762a96..074a70145f 100644 +--- a/include/openssl/dherr.h ++++ b/include/openssl/dherr.h +@@ -1,6 +1,6 @@ + /* + * Generated by util/mkerr.pl DO NOT EDIT +- * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved. ++ * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the Apache License 2.0 (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy +@@ -50,6 +50,7 @@ + # define DH_R_NO_PRIVATE_VALUE 100 + # define DH_R_PARAMETER_ENCODING_ERROR 105 + # define DH_R_PEER_KEY_ERROR 111 ++# define DH_R_Q_TOO_LARGE 130 + # define DH_R_SHARED_INFO_ERROR 113 + # define DH_R_UNABLE_TO_CHECK_GENERATOR 121 + diff --git a/openssl.spec b/openssl.spec index a22b793..b3b5ac6 100644 --- a/openssl.spec +++ b/openssl.spec @@ -203,6 +203,7 @@ Patch127: 0127-CVE-2023-3817.patch Patch128: 0128-CVE-2023-5363.patch # https://github.com/openssl/openssl/pull/22403 Patch129: 0129-rsa-Add-SP800-56Br2-6.4.1.2.1-3.c-check.patch +Patch130: 0130-CVE-2023-5678.patch License: ASL 2.0 URL: http://www.openssl.org/ @@ -555,6 +556,8 @@ ln -s /etc/crypto-policies/back-ends/openssl_fips.config $RPM_BUILD_ROOT%{_sysco Resolves: RHEL-14083 - Add missing ECDH Public Key Check in FIPS mode Resolves: RHEL-15990 +- Excessive time spent in DH check/generation with large Q parameter value (CVE-2023-5678) + Resolves: RHEL-15954 * Wed Jul 12 2023 Dmitry Belyavskiy - 1:3.0.7-24 - Make FIPS module configuration more crypto-policies friendly