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Fix timing side-channel in ECDSA signature computation (CVE-2024-13176)

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Resolves: RHEL-70879
This commit is contained in:
Dmitry Belyavskiy 2025-01-29 18:34:26 +01:00
parent 34e41ff200
commit d6a9e4cbb6
2 changed files with 100 additions and 1 deletions

93
0142-CVE-2024-13176-Minerva.patch Normal file
View File

@ -0,0 +1,93 @@
diff --git a/crypto/bn/bn_exp.c b/crypto/bn/bn_exp.c
index b876edbfac36e..af52e2ced6914 100644
--- a/crypto/bn/bn_exp.c
+++ b/crypto/bn/bn_exp.c
@@ -606,7 +606,7 @@ static int MOD_EXP_CTIME_COPY_FROM_PREBUF(BIGNUM *b, int top,
* out by Colin Percival,
* http://www.daemonology.net/hyperthreading-considered-harmful/)
*/
-int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
+int bn_mod_exp_mont_fixed_top(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx,
BN_MONT_CTX *in_mont)
{
@@ -623,10 +623,6 @@ int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
unsigned int t4 = 0;
#endif
- bn_check_top(a);
- bn_check_top(p);
- bn_check_top(m);
-
if (!BN_is_odd(m)) {
ERR_raise(ERR_LIB_BN, BN_R_CALLED_WITH_EVEN_MODULUS);
return 0;
@@ -1146,7 +1142,7 @@ int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
goto err;
} else
#endif
- if (!BN_from_montgomery(rr, &tmp, mont, ctx))
+ if (!bn_from_mont_fixed_top(rr, &tmp, mont, ctx))
goto err;
ret = 1;
err:
@@ -1160,6 +1156,19 @@ int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
return ret;
}
+int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
+ const BIGNUM *m, BN_CTX *ctx,
+ BN_MONT_CTX *in_mont)
+{
+ bn_check_top(a);
+ bn_check_top(p);
+ bn_check_top(m);
+ if (!bn_mod_exp_mont_fixed_top(rr, a, p, m, ctx, in_mont))
+ return 0;
+ bn_correct_top(rr);
+ return 1;
+}
+
int BN_mod_exp_mont_word(BIGNUM *rr, BN_ULONG a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)
{
diff --git a/crypto/ec/ec_lib.c b/crypto/ec/ec_lib.c
index 19384eba186b5..3f8d65c1bf1a1 100644
--- a/crypto/ec/ec_lib.c
+++ b/crypto/ec/ec_lib.c
@@ -21,6 +21,7 @@
#include <openssl/opensslv.h>
#include <openssl/param_build.h>
#include "crypto/ec.h"
+#include "crypto/bn.h"
#include "internal/nelem.h"
#include "ec_local.h"
@@ -1265,10 +1266,10 @@ static int ec_field_inverse_mod_ord(const EC_GROUP *group, BIGNUM *r,
if (!BN_sub(e, group->order, e))
goto err;
/*-
- * Exponent e is public.
- * No need for scatter-gather or BN_FLG_CONSTTIME.
+ * Although the exponent is public we want the result to be
+ * fixed top.
*/
- if (!BN_mod_exp_mont(r, x, e, group->order, ctx, group->mont_data))
+ if (!bn_mod_exp_mont_fixed_top(r, x, e, group->order, ctx, group->mont_data))
goto err;
ret = 1;
diff --git a/include/crypto/bn.h b/include/crypto/bn.h
index 47d9b44f879f0..bdee28625ce60 100644
--- a/include/crypto/bn.h
+++ b/include/crypto/bn.h
@@ -73,6 +73,9 @@ int bn_set_words(BIGNUM *a, const BN_ULONG *words, int num_words);
*/
int bn_mul_mont_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
BN_MONT_CTX *mont, BN_CTX *ctx);
+int bn_mod_exp_mont_fixed_top(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
+ const BIGNUM *m, BN_CTX *ctx,
+ BN_MONT_CTX *in_mont);
int bn_to_mont_fixed_top(BIGNUM *r, const BIGNUM *a, BN_MONT_CTX *mont,
BN_CTX *ctx);
int bn_from_mont_fixed_top(BIGNUM *r, const BIGNUM *a, BN_MONT_CTX *mont,

8
openssl.spec
View File

@ -29,7 +29,7 @@ print(string.sub(hash, 0, 16))
Summary: Utilities from the general purpose cryptography library with TLS implementation
Name: openssl
Version: 3.2.2
Release: 15%{?dist}
Release: 16%{?dist}
Epoch: 1
Source: openssl-%{version}.tar.gz
Source2: Makefile.certificate
@ -185,6 +185,8 @@ Patch139: 0139-CVE-2024-6119.patch
Patch140: 0140-prov_no-cache.patch
# https://github.com/openssl/openssl/pull/25959
Patch141: 0141-print-pq-group.patch
# https://github.com/openssl/openssl/pull/26429
Patch142: 0142-CVE-2024-13176-Minerva.patch
License: Apache-2.0
URL: http://www.openssl.org/
@ -539,6 +541,10 @@ touch $RPM_BUILD_ROOT/%{_prefix}/include/openssl/engine.h
%ldconfig_scriptlets libs
%changelog
* Wed Jan 29 2025 Dmitry Belyavskiy <dbelyavs@redhat.com> - 1:3.2.2-16
- Fix timing side-channel in ECDSA signature computation (CVE-2024-13176)
Resolves: RHEL-70879
* Thu Jan 02 2025 Dmitry Belyavskiy <dbelyavs@redhat.com> - 1:3.2.2-15
- Fix providers no_cache behavior
Resolves: RHEL-71903