blob: bd85cfcb91132e667757ec636fd4a9499775ddd5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
commit 0adec29674561034771c13e446069b41ef41e4d4
Author: Michael Chang <mchang@suse.com>
Date: Fri Dec 3 16:13:28 2021 +0800
grub-mkconfig: Restore umask for the grub.cfg
The commit ab2e53c8a (grub-mkconfig: Honor a symlink when generating
configuration by grub-mkconfig) has inadvertently discarded umask for
creating grub.cfg in the process of running grub-mkconfig. The resulting
wrong permission (0644) would allow unprivileged users to read GRUB
configuration file content. This presents a low confidentiality risk
as grub.cfg may contain non-secured plain-text passwords.
This patch restores the missing umask and sets the creation file mode
to 0600 preventing unprivileged access.
Fixes: CVE-2021-3981
Signed-off-by: Michael Chang <mchang@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in
index c3ea7612e..62335d027 100644
--- a/util/grub-mkconfig.in
+++ b/util/grub-mkconfig.in
@@ -301,7 +301,10 @@ and /etc/grub.d/* files or please file a bug report with
exit 1
else
# none of the children aborted with error, install the new grub.cfg
+ oldumask=$(umask)
+ umask 077
cat ${grub_cfg}.new > ${grub_cfg}
+ umask $oldumask
rm -f ${grub_cfg}.new
fi
fi
|
