diff options
Diffstat (limited to 'gnu/packages/patches/openssl-CVE-2016-2178.patch')
| -rw-r--r-- | gnu/packages/patches/openssl-CVE-2016-2178.patch | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/gnu/packages/patches/openssl-CVE-2016-2178.patch b/gnu/packages/patches/openssl-CVE-2016-2178.patch deleted file mode 100644 index 37cf2763af..0000000000 --- a/gnu/packages/patches/openssl-CVE-2016-2178.patch +++ /dev/null @@ -1,112 +0,0 @@ -Fix CVE-2016-2178. - -<https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2178> - -Source: -<https://git.openssl.org/?p=openssl.git;a=commit;h=621eaf49a289bfac26d4cbcdb7396e796784c534> -<https://git.openssl.org/?p=openssl.git;a=commit;h=b7d0f2834e139a20560d64c73e2565e93715ce2b> - -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 1/2] 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> ---- - 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)) --- -2.8.4 - -From b7d0f2834e139a20560d64c73e2565e93715ce2b Mon Sep 17 00:00:00 2001 -From: Matt Caswell <matt@openssl.org> -Date: Tue, 7 Jun 2016 09:12:51 +0100 -Subject: [PATCH 2/2] More fix DSA, preserve BN_FLG_CONSTTIME - -The previous "fix" still left "k" exposed to constant time problems in -the later BN_mod_inverse() call. Ensure both k and kq have the -BN_FLG_CONSTTIME flag set at the earliest opportunity after creation. - -CVE-2016-2178 - -Reviewed-by: Rich Salz <rsalz@openssl.org> ---- - crypto/dsa/dsa_ossl.c | 11 ++++++++--- - 1 file changed, 8 insertions(+), 3 deletions(-) - -diff --git a/crypto/dsa/dsa_ossl.c b/crypto/dsa/dsa_ossl.c -index b29eb4b..58013a4 100644 ---- a/crypto/dsa/dsa_ossl.c -+++ b/crypto/dsa/dsa_ossl.c -@@ -247,7 +247,12 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, - do - if (!BN_rand_range(&k, dsa->q)) - goto err; -- while (BN_is_zero(&k)) ; -+ 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, -@@ -261,6 +266,8 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, - if (!BN_copy(&kq, &k)) - goto err; - -+ BN_set_flags(&kq, BN_FLG_CONSTTIME); -+ - /* - * We do not want timing information to leak the length of k, so we - * compute g^k using an equivalent exponent of fixed length. (This -@@ -276,8 +283,6 @@ 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; - } --- -2.8.4 - |