[oe-commits] [openembedded-core] 15/60: openssl: fix CVE-2018-0734 for both 1.0.2p and 1.1.1
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Tue Nov 6 11:58:15 UTC 2018
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rpurdie pushed a commit to branch master-next
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commit 9d5c6a87eb72a8b8b8d417126a831565982ca9a6
Author: Kai Kang <kai.kang at windriver.com>
AuthorDate: Fri Nov 2 16:02:13 2018 +0800
openssl: fix CVE-2018-0734 for both 1.0.2p and 1.1.1
Backport patches to fix CVE-2018-0734 for both openssl 1.0.2p and 1.1.1
versions.
Signed-off-by: Kai Kang <kai.kang at windriver.com>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
.../openssl/openssl/0002-fix-CVE-2018-0734.patch | 108 +++++++++++++++++++++
.../openssl/openssl10/0001-fix-CVE-2018-0734.patch | 33 +++++++
.../openssl/openssl10_1.0.2p.bb | 1 +
meta/recipes-connectivity/openssl/openssl_1.1.1.bb | 1 +
4 files changed, 143 insertions(+)
diff --git a/meta/recipes-connectivity/openssl/openssl/0002-fix-CVE-2018-0734.patch b/meta/recipes-connectivity/openssl/openssl/0002-fix-CVE-2018-0734.patch
new file mode 100644
index 0000000..2a3e03f
--- /dev/null
+++ b/meta/recipes-connectivity/openssl/openssl/0002-fix-CVE-2018-0734.patch
@@ -0,0 +1,108 @@
+Backport patch to fix CVE-2018-0734. Remove a section which only remove a
+space. It can't be applied because the context is different.
+
+CVE: CVE-2018-0734
+Upstream-Status: Backport
+
+Signed-off-by: Kai Kang <kai.kang at windriver.com>
+
+From 8abfe72e8c1de1b95f50aa0d9134803b4d00070f Mon Sep 17 00:00:00 2001
+From: Pauli <paul.dale at oracle.com>
+Date: Wed, 24 Oct 2018 07:42:46 +1000
+Subject: [PATCH] Timing vulnerability in DSA signature generation
+ (CVE-2018-0734).
+
+Avoid a timing attack that leaks information via a side channel that
+triggers when a BN is resized. Increasing the size of the BNs
+prior to doing anything with them suppresses the attack.
+
+Thanks due to Samuel Weiser for finding and locating this.
+
+Reviewed-by: Bernd Edlinger <bernd.edlinger at hotmail.de>
+(Merged from https://github.com/openssl/openssl/pull/7486)
+
+(cherry picked from commit a9cfb8c2aa7254a4aa6a1716909e3f8cb78049b6)
+---
+ crypto/dsa/dsa_ossl.c | 28 +++++++++++++++-------------
+ 1 file changed, 15 insertions(+), 13 deletions(-)
+
+diff --git a/crypto/dsa/dsa_ossl.c b/crypto/dsa/dsa_ossl.c
+index ca20811200..2dd2d7489a 100644
+--- a/crypto/dsa/dsa_ossl.c
++++ b/crypto/dsa/dsa_ossl.c
+@@ -9,6 +9,7 @@
+
+ #include <stdio.h>
+ #include "internal/cryptlib.h"
++#include "internal/bn_int.h"
+ #include <openssl/bn.h>
+ #include <openssl/sha.h>
+ #include "dsa_locl.h"
+@@ -180,9 +181,9 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in,
+ {
+ BN_CTX *ctx = NULL;
+ BIGNUM *k, *kinv = NULL, *r = *rp;
+- BIGNUM *l, *m;
++ BIGNUM *l;
+ int ret = 0;
+- int q_bits;
++ int q_bits, q_words;
+
+ if (!dsa->p || !dsa->q || !dsa->g) {
+ DSAerr(DSA_F_DSA_SIGN_SETUP, DSA_R_MISSING_PARAMETERS);
+@@ -191,8 +192,7 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in,
+
+ k = BN_new();
+ l = BN_new();
+- m = BN_new();
+- if (k == NULL || l == NULL || m == NULL)
++ if (k == NULL || l == NULL)
+ goto err;
+
+ if (ctx_in == NULL) {
+@@ -203,9 +203,9 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in,
+
+ /* Preallocate space */
+ q_bits = BN_num_bits(dsa->q);
+- if (!BN_set_bit(k, q_bits)
+- || !BN_set_bit(l, q_bits)
+- || !BN_set_bit(m, q_bits))
++ q_words = bn_get_top(dsa->q);
++ if (!bn_wexpand(k, q_words + 2)
++ || !bn_wexpand(l, q_words + 2))
+ goto err;
+
+ /* Get random k */
+@@ -240,14 +240,17 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in,
+ * small timing information leakage. We then choose the sum that is
+ * one bit longer than the modulus.
+ *
+- * TODO: revisit the BN_copy aiming for a memory access agnostic
+- * conditional copy.
++ * There are some concerns about the efficacy of doing this. More
++ * specificly refer to the discussion starting with:
++ * https://github.com/openssl/openssl/pull/7486#discussion_r228323705
++ * The fix is to rework BN so these gymnastics aren't required.
+ */
+ if (!BN_add(l, k, dsa->q)
+- || !BN_add(m, l, dsa->q)
+- || !BN_copy(k, BN_num_bits(l) > q_bits ? l : m))
++ || !BN_add(k, l, dsa->q))
+ goto err;
+
++ BN_consttime_swap(BN_is_bit_set(l, q_bits), k, l, q_words + 2);
++
+ if ((dsa)->meth->bn_mod_exp != NULL) {
+ if (!dsa->meth->bn_mod_exp(dsa, r, dsa->g, k, dsa->p, ctx,
+ dsa->method_mont_p))
+@@ -275,7 +278,6 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in,
+ BN_CTX_free(ctx);
+ BN_clear_free(k);
+ BN_clear_free(l);
+- BN_clear_free(m);
+ return ret;
+ }
+
+--
+2.17.0
+
diff --git a/meta/recipes-connectivity/openssl/openssl10/0001-fix-CVE-2018-0734.patch b/meta/recipes-connectivity/openssl/openssl10/0001-fix-CVE-2018-0734.patch
new file mode 100644
index 0000000..b9865a6
--- /dev/null
+++ b/meta/recipes-connectivity/openssl/openssl10/0001-fix-CVE-2018-0734.patch
@@ -0,0 +1,33 @@
+CVE: CVE-2018-0734
+
+Upstream-Status: Backport
+
+Signed-off-by: Kai Kang <kai.kang at windriver.com>
+
+From 43e6a58d4991a451daf4891ff05a48735df871ac Mon Sep 17 00:00:00 2001
+From: Pauli <paul.dale at oracle.com>
+Date: Mon, 29 Oct 2018 08:24:22 +1000
+Subject: [PATCH] Merge DSA reallocation timing fix CVE-2018-0734.
+
+Reviewed-by: Richard Levitte <levitte at openssl.org>
+(Merged from https://github.com/openssl/openssl/pull/7513)
+---
+ crypto/dsa/dsa_ossl.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/crypto/dsa/dsa_ossl.c b/crypto/dsa/dsa_ossl.c
+index 2dcfedeeee..100e269268 100644
+--- a/crypto/dsa/dsa_ossl.c
++++ b/crypto/dsa/dsa_ossl.c
+@@ -279,7 +279,7 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
+ goto err;
+
+ /* Preallocate space */
+- q_bits = BN_num_bits(dsa->q);
++ q_bits = BN_num_bits(dsa->q) + sizeof(dsa->q->d[0]) * 16;
+ if (!BN_set_bit(&k, q_bits)
+ || !BN_set_bit(&l, q_bits)
+ || !BN_set_bit(&m, q_bits))
+--
+2.17.0
+
diff --git a/meta/recipes-connectivity/openssl/openssl10_1.0.2p.bb b/meta/recipes-connectivity/openssl/openssl10_1.0.2p.bb
index 7661109..4325940 100644
--- a/meta/recipes-connectivity/openssl/openssl10_1.0.2p.bb
+++ b/meta/recipes-connectivity/openssl/openssl10_1.0.2p.bb
@@ -40,6 +40,7 @@ SRC_URI = "http://www.openssl.org/source/openssl-${PV}.tar.gz \
file://0001-Fix-build-with-clang-using-external-assembler.patch \
file://0001-openssl-force-soft-link-to-avoid-rare-race.patch \
file://0001-allow-manpages-to-be-disabled.patch \
+ file://0001-fix-CVE-2018-0734.patch \
"
SRC_URI_append_class-target = " \
diff --git a/meta/recipes-connectivity/openssl/openssl_1.1.1.bb b/meta/recipes-connectivity/openssl/openssl_1.1.1.bb
index af9038a..052f246 100644
--- a/meta/recipes-connectivity/openssl/openssl_1.1.1.bb
+++ b/meta/recipes-connectivity/openssl/openssl_1.1.1.bb
@@ -15,6 +15,7 @@ SRC_URI = "http://www.openssl.org/source/openssl-${PV}.tar.gz \
file://run-ptest \
file://openssl-c_rehash.sh \
file://0001-skip-test_symbol_presence.patch \
+ file://0002-fix-CVE-2018-0734.patch \
"
SRC_URI_append_class-nativesdk = " \
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