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libgcrypt: fix CVE-2017-9526

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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: 04d7a4adafa09f9f3012c355f4f2f9728cb0b166)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Ross Burton
2017-07-18 23:07:34 +01:00
committed by Richard Purdie
parent fd7f2d644a
commit bbe268e060
2 changed files with 40 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta/recipes-support/libgcrypt/files/0001-ecc-Store-EdDSA-session-key-in-secure-memory.patch
+39
View File
@@ -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
meta/recipes-support/libgcrypt/libgcrypt.inc
+1
View File
@@ -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"