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grub 2.00: Bugfix for CVE-2015-8370

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See: http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html

"A vulnerability in Grub2 has been found. Versions from 1.98 (December, 2009)
to 2.02 (December, 2015) are affected. The vulnerability can be exploited
under certain circumstances, allowing local attackers to bypass any kind of
authentication (plain or hashed passwords). And so, the attacker may take
control of the computer."

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
This commit is contained in:
Matthias Fischer
2015-12-18 21:28:52 +01:00
committed by Michael Tremer
parent 1e1b03d581
commit 44fb4620ee
2 changed files with 47 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
lfs/grub
View File

@@ -1,7 +1,7 @@
###############################################################################
# #
# IPFire.org - A linux based firewall #
# Copyright (C) 2007-2014 IPFire Team <info@ipfire.org> #
# Copyright (C) 2007-2015 IPFire Team <info@ipfire.org> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
@@ -78,6 +78,7 @@ $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
@$(PREBUILD)
@rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar axf $(DIR_DL)/$(DL_FILE)
cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/grub-2.00_disable_vga_fallback.patch
cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/0001-Fix-CVE-2015-8370-Grub2-user-pass-vulnerability.patch
cd $(DIR_APP) && \
./configure \
--prefix=/usr \

45
src/patches/0001-Fix-CVE-2015-8370-Grub2-user-pass-vulnerability.patch Normal file
View File

@@ -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
@@ -456,7 +456,7 @@ 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