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grub2: Fix CVE-2015-8370

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This CVE is a culmination of multiple integer overflow issues that cause
multiple issues like Denial of Service and authentication bypass.

More info: https://nvd.nist.gov/vuln/detail/CVE-2015-8370

Taken from Fedora.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
This commit is contained in:
Rosen Penev 2018-08-22 19:07:57 -07:00 committed by Jo-Philipp Wich
parent f9469efbfa
commit 7e73e9128f
2 changed files with 45 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
package/boot/grub2/Makefile
View File

@ -11,7 +11,7 @@ include $(INCLUDE_DIR)/kernel.mk
PKG_NAME:=grub
PKG_CPE_ID:=cpe:/a:gnu:grub2
PKG_VERSION:=2.02
PKG_RELEASE:=1
PKG_RELEASE:=2
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
PKG_SOURCE_URL:=@GNU/grub

44
package/boot/grub2/patches/300-CVE-2015-8370.patch Normal file
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@ -0,0 +1,44 @@
From 0000000000000000000000000000000000000000 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
Resolves: CVE-2015-8370
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 ca334d5a40e..e6c78d16d39 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)
{
if (cur_len)
cur_len--;
diff --git a/grub-core/normal/auth.c b/grub-core/normal/auth.c
index 6be678c0de1..c35ce972473 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 == GRUB_TERM_BACKSPACE)
+ if (key == GRUB_TERM_BACKSPACE && cur_len)
{
if (cur_len)
{