From 2752dba61da730ccd914b7720490754a476d1024 Mon Sep 17 00:00:00 2001 From: Armin Kuster Date: Fri, 23 Sep 2016 23:00:38 -0700 Subject: openssl: Security fix CVE-2016-2178 affects openssl < 1.0.2i Signed-off-by: Armin Kuster --- .../openssl/openssl/CVE-2016-2178.patch | 54 ++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 meta/recipes-connectivity/openssl/openssl/CVE-2016-2178.patch (limited to 'meta/recipes-connectivity/openssl/openssl/CVE-2016-2178.patch') 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 0000000000..07b131082e --- /dev/null +++ b/meta/recipes-connectivity/openssl/openssl/CVE-2016-2178.patch @@ -0,0 +1,54 @@ +From 621eaf49a289bfac26d4cbcdb7396e796784c534 Mon Sep 17 00:00:00 2001 +From: Cesar Pereida +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 +Reviewed-by: Matt Caswell + +Upstream-Status: Backport +CVE: CVE-2016-2178 +Signed-off-by: Armin Kuster + +--- + 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 + -- cgit 1.2.3-korg