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commit 48821e53b0d6c367d743bb1f1ea4f4da983b9d08
parent 273615b005ad1c7fd5cac81c30d190dc9a114d76
Author: Francis Rowe <info@gluglug.org.uk>
Date:   Tue, 15 Dec 2015 23:15:52 +0000

GRUB: fix security issue with password auth (integer underflow)

Diffstat:
resources/grub/patch/secfix/0001-Fix-CVE-2015-8370-Grub2-user-pass-vulnerability.patch | 45+++++++++++++++++++++++++++++++++++++++++++++
resources/scripts/helpers/download/grub | 4++++
2 files changed, 49 insertions(+), 0 deletions(-)

diff --git a/resources/grub/patch/secfix/0001-Fix-CVE-2015-8370-Grub2-user-pass-vulnerability.patch b/resources/grub/patch/secfix/0001-Fix-CVE-2015-8370-Grub2-user-pass-vulnerability.patch @@ -0,0 +1,45 @@ +From 88c9657960a6c5d3673a25c266781e876c181add Mon Sep 17 00:00:00 2001 +From: Hector Marco-Gisbert <hecmargi@upv.es> +Date: Fri, 13 Nov 2015 16:21:09 +0100 +Subject: [PATCH] Fix security issue when reading username and password + + This patch fixes two integer underflows at: + * grub-core/lib/crypto.c + * grub-core/normal/auth.c + +Signed-off-by: Hector Marco-Gisbert <hecmargi@upv.es> +Signed-off-by: Ismael Ripoll-Ripoll <iripoll@disca.upv.es> +--- + grub-core/lib/crypto.c | 2 +- + grub-core/normal/auth.c | 2 +- + 2 files changed, 2 insertions(+), 2 deletions(-) + +diff --git a/grub-core/lib/crypto.c b/grub-core/lib/crypto.c +index 010e550..524a3d8 100644 +--- a/grub-core/lib/crypto.c ++++ b/grub-core/lib/crypto.c +@@ -468,7 +468,7 @@ grub_password_get (char buf[], unsigned buf_size) + break; + } + +- if (key == '\b') ++ if (key == '\b' && cur_len) + { + cur_len--; + continue; +diff --git a/grub-core/normal/auth.c b/grub-core/normal/auth.c +index c6bd96e..5782ec5 100644 +--- a/grub-core/normal/auth.c ++++ b/grub-core/normal/auth.c +@@ -172,7 +172,7 @@ grub_username_get (char buf[], unsigned buf_size) + break; + } + +- if (key == '\b') ++ if (key == '\b' && cur_len) + { + cur_len--; + grub_printf ("\b"); +-- +1.9.1 + diff --git a/resources/scripts/helpers/download/grub b/resources/scripts/helpers/download/grub @@ -63,5 +63,9 @@ git am "../resources/grub/patch/reproducible/0001-mkstandalone-add-argument-fixe git am "../resources/grub/patch/reproducible/0002-mkrescue-add-argument-fixed-time-to-get-reproducible.patch" git am "../resources/grub/patch/reproducible/0003-Makefile-use-FIXED_TIMESTAMP-for-mkstandalone-if-set.patch" +# Patch security vulnerability in GRUB +# See: http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html +git am "../resources/grub/patch/secfix/0001-Fix-CVE-2015-8370-Grub2-user-pass-vulnerability.patch" + cd "../" printf "\n\n"