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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. (From OE-Core rev: fb28c54347fcf4957b9b8ee7dee423d859eb7820) Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
40 lines
1.3 KiB
Diff
40 lines
1.3 KiB
Diff
CVE: CVE-2017-9526
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Upstream-Status: Backport
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Signed-off-by: Ross Burton <ross.burton@intel.com>
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From b3cab278eb9c2ceda79f980bc26460d97f260041 Mon Sep 17 00:00:00 2001
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From: Jo Van Bulck <jo.vanbulck@cs.kuleuven.be>
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Date: Thu, 19 Jan 2017 17:00:15 +0100
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Subject: [PATCH] ecc: Store EdDSA session key in secure memory.
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* cipher/ecc-eddsa.c (_gcry_ecc_eddsa_sign): use mpi_snew to allocate
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session key.
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--
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An attacker who learns the EdDSA session key from side-channel
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observation during the signing process, can easily revover the long-
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term secret key. Storing the session key in secure memory ensures that
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constant time point operations are used in the MPI library.
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Signed-off-by: Jo Van Bulck <jo.vanbulck@cs.kuleuven.be>
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---
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cipher/ecc-eddsa.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/cipher/ecc-eddsa.c b/cipher/ecc-eddsa.c
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index f91f8489..813e030d 100644
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--- a/cipher/ecc-eddsa.c
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+++ b/cipher/ecc-eddsa.c
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@@ -603,7 +603,7 @@ _gcry_ecc_eddsa_sign (gcry_mpi_t input, ECC_secret_key *skey,
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a = mpi_snew (0);
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x = mpi_new (0);
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y = mpi_new (0);
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- r = mpi_new (0);
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+ r = mpi_snew (0);
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ctx = _gcry_mpi_ec_p_internal_new (skey->E.model, skey->E.dialect, 0,
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skey->E.p, skey->E.a, skey->E.b);
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b = (ctx->nbits+7)/8;
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--
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2.11.0
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