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openssl: Security fix CVE-2016-2178

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affects openssl < 1.0.2i

(From OE-Core rev: 2752dba61da730ccd914b7720490754a476d1024)

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Armin Kuster
2016-09-23 23:00:38 -07:00
committed by Richard Purdie
parent 9fd6b093a4
commit 9995a7a144
2 changed files with 55 additions and 0 deletions
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54
meta/recipes-connectivity/openssl/openssl/CVE-2016-2178.patch Normal file
View File

@@ -0,0 +1,54 @@
From 621eaf49a289bfac26d4cbcdb7396e796784c534 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 | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/crypto/dsa/dsa_ossl.c b/crypto/dsa/dsa_ossl.c
index efc4f1b..b29eb4b 100644
--- a/crypto/dsa/dsa_ossl.c
+++ b/crypto/dsa/dsa_ossl.c
@@ -248,9 +248,6 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
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,
@@ -279,9 +276,12 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
}
K = &kq;
+
+ BN_set_flags(K, BN_FLG_CONSTTIME);
} else {
K = &k;
}
+
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))
--
2.7.4

1
meta/recipes-connectivity/openssl/openssl_1.0.2h.bb
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@@ -38,6 +38,7 @@ SRC_URI += "file://find.pl;subdir=${BP}/util/ \
file://ptest_makefile_deps.patch \
file://configure-musl-target.patch \
file://parallel.patch \
file://CVE-2016-2178.patch \
"
SRC_URI[md5sum] = "9392e65072ce4b614c1392eefc1f23d0"
SRC_URI[sha256sum] = "1d4007e53aad94a5b2002fe045ee7bb0b3d98f1a47f8b2bc851dcd1c74332919"