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authorArmin Kuster <akuster@mvista.com>2016-07-16 16:04:12 -0700
committerRichard Purdie <richard.purdie@linuxfoundation.org>2016-09-23 23:21:43 +0100
commit82fe0e8c98244794531f0e24ceb93953fe68dda5 (patch)
tree8d119c8c9325473085b022e8a3d8d087a5b48771
parent5781eb9a6e6bf8984b090a488d2a326bf9fafcf8 (diff)
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openssl: Security fix CVE-2016-2178
affects openssl <= 1.0.2h CVSS v2 Base Score: 2.1 LOW Signed-off-by: Armin Kuster <akuster@mvista.com> Signed-off-by: Ross Burton <ross.burton@intel.com> (cherry picked from commit 5b3df0c5e8885ea34f66b41fcf209a9960fbbf5e) Signed-off-by: Armin Kuster <akuster808@gmail.com>
-rw-r--r--meta/recipes-connectivity/openssl/openssl/CVE-2016-2178.patch51
-rw-r--r--meta/recipes-connectivity/openssl/openssl_1.0.2h.bb1
2 files changed, 52 insertions, 0 deletions
diff --git a/meta/recipes-connectivity/openssl/openssl/CVE-2016-2178.patch b/meta/recipes-connectivity/openssl/openssl/CVE-2016-2178.patch
new file mode 100644
index 0000000..27ade4e
--- /dev/null
+++ b/meta/recipes-connectivity/openssl/openssl/CVE-2016-2178.patch
@@ -0,0 +1,51 @@
+From 399944622df7bd81af62e67ea967c470534090e2 Mon Sep 17 00:00:00 2001
+From: Cesar Pereida <cesar.pereida@aalto.fi>
+Date: Mon, 23 May 2016 12:45:25 +0300
+Subject: [PATCH] Fix DSA, preserve BN_FLG_CONSTTIME
+
+Operations in the DSA signing algorithm should run in constant time in
+order to avoid side channel attacks. A flaw in the OpenSSL DSA
+implementation means that a non-constant time codepath is followed for
+certain operations. This has been demonstrated through a cache-timing
+attack to be sufficient for an attacker to recover the private DSA key.
+
+CVE-2016-2178
+
+Reviewed-by: Richard Levitte <levitte@openssl.org>
+Reviewed-by: Matt Caswell <matt@openssl.org>
+
+Upstream-Status: Backport
+CVE: CVE-2016-2178
+
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ crypto/dsa/dsa_ossl.c | 9 +++++----
+ 1 file changed, 5 insertions(+), 4 deletions(-)
+
+Index: openssl-1.0.2h/crypto/dsa/dsa_ossl.c
+===================================================================
+--- openssl-1.0.2h.orig/crypto/dsa/dsa_ossl.c
++++ openssl-1.0.2h/crypto/dsa/dsa_ossl.c
+@@ -248,9 +248,6 @@ static int dsa_sign_setup(DSA *dsa, BN_C
+ if (!BN_rand_range(&k, dsa->q))
+ goto err;
+ while (BN_is_zero(&k)) ;
+- if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) {
+- BN_set_flags(&k, BN_FLG_CONSTTIME);
+- }
+
+ if (dsa->flags & DSA_FLAG_CACHE_MONT_P) {
+ if (!BN_MONT_CTX_set_locked(&dsa->method_mont_p,
+@@ -282,6 +279,11 @@ static int dsa_sign_setup(DSA *dsa, BN_C
+ } else {
+ K = &k;
+ }
++
++ if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) {
++ BN_set_flags(K, BN_FLG_CONSTTIME);
++ }
++
+ DSA_BN_MOD_EXP(goto err, dsa, r, dsa->g, K, dsa->p, ctx,
+ dsa->method_mont_p);
+ if (!BN_mod(r, r, dsa->q, ctx))
diff --git a/meta/recipes-connectivity/openssl/openssl_1.0.2h.bb b/meta/recipes-connectivity/openssl/openssl_1.0.2h.bb
index 4135a31..07cb0f9 100644
--- a/meta/recipes-connectivity/openssl/openssl_1.0.2h.bb
+++ b/meta/recipes-connectivity/openssl/openssl_1.0.2h.bb
@@ -39,6 +39,7 @@ SRC_URI += "file://configure-targets.patch \
file://ptest_makefile_deps.patch \
file://parallel.patch \
file://CVE-2016-2177.patch \
+ file://CVE-2016-2178.patch \
"
SRC_URI[md5sum] = "9392e65072ce4b614c1392eefc1f23d0"