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| author |   Ross Burton <ross.burton@intel.com> | 2017-07-18 23:07:34 +0100 |
|---|---|---|
| committer |   Richard Purdie <richard.purdie@linuxfoundation.org> | 2017-07-19 11:29:54 +0100 |
| commit | 04d7a4adafa09f9f3012c355f4f2f9728cb0b166 (patch) | |
| tree | b496bab7ad1fe3c9b5254d3331867dd53890bdd3 | |
| parent | befda6ce3fd916ab04c035d1d82ed173759f7f09 (diff) | |
| download | openembedded-core-04d7a4adafa09f9f3012c355f4f2f9728cb0b166.tar.gz | |
libgcrypt: fix CVE-2017-9526
In libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from
side-channel observation during the signing process) can easily recover the
long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this
session key in secure memory, to ensure that constant-time point operations are
used in the MPI library.
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
| -rw-r--r-- | meta/recipes-support/libgcrypt/files/0001-ecc-Store-EdDSA-session-key-in-secure-memory.patch | 39 | ||||
| -rw-r--r-- | meta/recipes-support/libgcrypt/libgcrypt.inc | 1 |
2 files changed, 40 insertions, 0 deletions
diff --git a/meta/recipes-support/libgcrypt/files/0001-ecc-Store-EdDSA-session-key-in-secure-memory.patch b/meta/recipes-support/libgcrypt/files/0001-ecc-Store-EdDSA-session-key-in-secure-memory.patch new file mode 100644 index 0000000000..f6c4ca76f3 --- /dev/null +++ b/meta/recipes-support/libgcrypt/files/0001-ecc-Store-EdDSA-session-key-in-secure-memory.patch @@ -0,0 +1,39 @@ +CVE: CVE-2017-9526 +Upstream-Status: Backport +Signed-off-by: Ross Burton <ross.burton@intel.com> + +From b3cab278eb9c2ceda79f980bc26460d97f260041 Mon Sep 17 00:00:00 2001 +From: Jo Van Bulck <jo.vanbulck@cs.kuleuven.be> +Date: Thu, 19 Jan 2017 17:00:15 +0100 +Subject: [PATCH] ecc: Store EdDSA session key in secure memory. + +* cipher/ecc-eddsa.c (_gcry_ecc_eddsa_sign): use mpi_snew to allocate +session key. +-- + +An attacker who learns the EdDSA session key from side-channel +observation during the signing process, can easily revover the long- +term secret key. Storing the session key in secure memory ensures that +constant time point operations are used in the MPI library. + +Signed-off-by: Jo Van Bulck <jo.vanbulck@cs.kuleuven.be> +--- + cipher/ecc-eddsa.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/cipher/ecc-eddsa.c b/cipher/ecc-eddsa.c +index f91f8489..813e030d 100644 +--- a/cipher/ecc-eddsa.c ++++ b/cipher/ecc-eddsa.c +@@ -603,7 +603,7 @@ _gcry_ecc_eddsa_sign (gcry_mpi_t input, ECC_secret_key *skey, + a = mpi_snew (0); + x = mpi_new (0); + y = mpi_new (0); +- r = mpi_new (0); ++ r = mpi_snew (0); + ctx = _gcry_mpi_ec_p_internal_new (skey->E.model, skey->E.dialect, 0, + skey->E.p, skey->E.a, skey->E.b); + b = (ctx->nbits+7)/8; +-- +2.11.0 + diff --git a/meta/recipes-support/libgcrypt/libgcrypt.inc b/meta/recipes-support/libgcrypt/libgcrypt.inc index 15805cd436..7c4c0e83b5 100644 --- a/meta/recipes-support/libgcrypt/libgcrypt.inc +++ b/meta/recipes-support/libgcrypt/libgcrypt.inc @@ -20,6 +20,7 @@ SRC_URI = "${GNUPG_MIRROR}/libgcrypt/libgcrypt-${PV}.tar.gz \ file://libgcrypt-fix-building-error-with-O2-in-sysroot-path.patch \ file://fix-ICE-failure-on-mips-with-option-O-and-g.patch \ file://fix-undefined-reference-to-pthread.patch \ + file://0001-ecc-Store-EdDSA-session-key-in-secure-memory.patch \ " BINCONFIG = "${bindir}/libgcrypt-config" |