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Security update for keyboard input vulnerability.
- Fix security issue when reading username and password Related: CVE-2015-8370 - Do a better job of handling GRUB2_PASSWORD Related: rhbz#1284370 Signed-off-by: Peter Jones <pjones@redhat.com>
This commit is contained in:
Peter Jones
Björn Esser
parent
d979a79ed2
commit
bf8e18bc1d
4 changed files with 130 additions and 1 deletions
2
.gitignore
vendored
2
.gitignore
vendored
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@ -4,3 +4,5 @@ clog
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/unifont-5.1.20080820.pcf.gz
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/theme.tar.bz2
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kojilogs
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/grub-*/
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.build*.log
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@ -0,0 +1,47 @@
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From b059b6f9c7d236e83829689a1615f180f230baaa Mon Sep 17 00:00:00 2001
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From: Hector Marco-Gisbert <hecmargi@upv.es>
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Date: Fri, 13 Nov 2015 16:21:09 +0100
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Subject: [PATCH 75/76] Fix security issue when reading username and password
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This patch fixes two integer underflows at:
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* grub-core/lib/crypto.c
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* grub-core/normal/auth.c
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Resolves: CVE-2015-8370
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Signed-off-by: Hector Marco-Gisbert <hecmargi@upv.es>
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Signed-off-by: Ismael Ripoll-Ripoll <iripoll@disca.upv.es>
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---
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grub-core/lib/crypto.c | 2 +-
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grub-core/normal/auth.c | 2 +-
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2 files changed, 2 insertions(+), 2 deletions(-)
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diff --git a/grub-core/lib/crypto.c b/grub-core/lib/crypto.c
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index 010e550..524a3d8 100644
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--- a/grub-core/lib/crypto.c
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+++ b/grub-core/lib/crypto.c
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@@ -468,7 +468,7 @@ grub_password_get (char buf[], unsigned buf_size)
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break;
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}
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- if (key == '\b')
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+ if (key == '\b' && cur_len)
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{
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cur_len--;
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continue;
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diff --git a/grub-core/normal/auth.c b/grub-core/normal/auth.c
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index c6bd96e..5782ec5 100644
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--- a/grub-core/normal/auth.c
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+++ b/grub-core/normal/auth.c
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@@ -172,7 +172,7 @@ grub_username_get (char buf[], unsigned buf_size)
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break;
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}
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- if (key == '\b')
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+ if (key == '\b' && cur_len)
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{
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cur_len--;
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grub_printf ("\b");
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--
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2.5.0
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44
0076-01_users-Handle-GRUB_PASSWORD-better.patch
Normal file
44
0076-01_users-Handle-GRUB_PASSWORD-better.patch
Normal file
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@ -0,0 +1,44 @@
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From e5e933f4fd449301fc1856db31ef1167b4867cd1 Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Fri, 4 Dec 2015 09:28:38 -0500
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Subject: [PATCH 76/76] 01_users: Handle GRUB_PASSWORD better.
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Only handle GRUB2_PASSWORD not GRUB_PASSWORD.
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Related: rhbz#1284370
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Signed-off-by: Peter Jones <pjones@redhat.com>
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---
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util/grub-setpassword.8 | 2 +-
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util/grub.d/01_users.in | 2 +-
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2 files changed, 2 insertions(+), 2 deletions(-)
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diff --git a/util/grub-setpassword.8 b/util/grub-setpassword.8
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index 5973abe..49200a8 100644
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--- a/util/grub-setpassword.8
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+++ b/util/grub-setpassword.8
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@@ -9,7 +9,7 @@
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\fBgrub-setpassword\fR outputs the user.cfg file which contains the hashed GRUB bootloader password. This utility only supports configurations where there is a single root user.
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The file has the format:
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-GRUB_2PASSWORD=<\fIhashed password\fR>.
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+GRUB2_PASSWORD=<\fIhashed password\fR>.
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.SH OPTIONS
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.TP
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diff --git a/util/grub.d/01_users.in b/util/grub.d/01_users.in
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index facd409..db2f44b 100644
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--- a/util/grub.d/01_users.in
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+++ b/util/grub.d/01_users.in
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@@ -2,7 +2,7 @@
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cat << EOF
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if [ -f \${prefix}/user.cfg ]; then
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source \${prefix}/user.cfg
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- if [ -n \${GRUB2_PASSWORD} ]; then
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+ if [ -n "\${GRUB2_PASSWORD}" ]; then
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set superusers="root"
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export superusers
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password_pbkdf2 root \${GRUB2_PASSWORD}
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--
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2.5.0
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38
grub2.spec
38
grub2.spec
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@ -45,7 +45,7 @@
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Name: grub2
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Epoch: 1
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Version: 2.02
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Release: 0.24%{?dist}
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Release: 0.25%{?dist}
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Summary: Bootloader with support for Linux, Multiboot and more
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Group: System Environment/Base
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@ -138,6 +138,8 @@ Patch0071: 0071-Make-exit-take-a-return-code.patch
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Patch0072: 0072-Add-some-__unused__-where-gcc-5.x-is-more-picky-abou.patch
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Patch0073: 0073-Fix-race-in-EFI-validation.patch
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Patch0074: 0074-Mark-po-exclude.pot-as-binary-so-git-won-t-try-to-di.patch
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Patch0075: 0075-Fix-security-issue-when-reading-username-and-passwor.patch
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Patch0076: 0076-01_users-Handle-GRUB_PASSWORD-better.patch
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@ -467,6 +469,34 @@ cp -a ${RPM_BUILD_ROOT}/usr/sbin %{finddebugroot}/usr/sbin
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%clean
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rm -rf $RPM_BUILD_ROOT
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%pre tools
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if [ -f /boot/grub2/user.cfg ]; then
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if grep -q '^GRUB_PASSWORD=' /boot/grub2/user.cfg ; then
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sed -i 's/^GRUB_PASSWORD=/GRUB2_PASSWORD=/' /boot/grub2/user.cfg
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fi
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elif [ -f /boot/efi/EFI/%{efidir}/user.cfg ]; then
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if grep -q '^GRUB_PASSWORD=' /boot/efi/EFI/%{efidir}/user.cfg ; then
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sed -i 's/^GRUB_PASSWORD=/GRUB2_PASSWORD=/' \
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/boot/efi/EFI/%{efidir}/user.cfg
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fi
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elif [ -f /etc/grub.d/01_users ] && \
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grep -q '^password_pbkdf2 root' /etc/grub.d/01_users ; then
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if [ -f /boot/efi/EFI/%{efidir}/grub.cfg ]; then
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# on EFI we don't get permissions on the file, but
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# the directory is protected.
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grep '^password_pbkdf2 root' /etc/grub.d/01_users | \
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sed 's/^password_pbkdf2 root \(.*\)$/GRUB2_PASSWORD=\1/' \
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> /boot/efi/EFI/%{efidir}/user.cfg
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fi
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if [ -f /boot/grub2/grub.cfg ]; then
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install -m 0600 /dev/null /boot/grub2/user.cfg
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chmod 0600 /boot/grub2/user.cfg
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grep '^password_pbkdf2 root' /etc/grub.d/01_users | \
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sed 's/^password_pbkdf2 root \(.*\)$/GRUB2_PASSWORD=\1/' \
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> /boot/grub2/user.cfg
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fi
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fi
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%post tools
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if [ "$1" = 1 ]; then
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/sbin/install-info --info-dir=%{_infodir} %{_infodir}/%{name}.info.gz || :
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@ -596,6 +626,12 @@ fi
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%{_datarootdir}/grub/themes/starfield
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%changelog
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* Thu Dec 10 2015 Peter Jones <pjones@redhat.com> - 2.02-0.25
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- Fix security issue when reading username and password
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Related: CVE-2015-8370
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- Do a better job of handling GRUB2_PASSWORD
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Related: rhbz#1284370
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* Fri Nov 20 2015 Peter Jones <pjones@redhat.com> - 2.02-0.24
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- Rebuild without multiboot* modules in the EFI image.
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Related: rhbz#1264103
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