84 lines
2.9 KiB
Diff
84 lines
2.9 KiB
Diff
From de9400db3f181e059f9ab1bb6a667ae2c29baf03 Mon Sep 17 00:00:00 2001
|
|
From: B Horn <b@horn.uk>
|
|
Date: Fri, 15 Nov 2024 13:12:09 +0000
|
|
Subject: [PATCH 08/20] net: Fix OOB write in grub_net_search_config_file()
|
|
|
|
The function included a call to grub_strcpy() which copied data from an
|
|
environment variable to a buffer allocated in grub_cmd_normal(). The
|
|
grub_cmd_normal() didn't consider the length of the environment variable.
|
|
So, the copy operation could exceed the allocation and lead to an OOB
|
|
write. Fix the issue by replacing grub_strcpy() with grub_strlcpy() and
|
|
pass the underlying buffers size to the grub_net_search_config_file().
|
|
|
|
Fixes: CVE-2025-0624
|
|
|
|
Reported-by: B Horn <b@horn.uk>
|
|
Signed-off-by: B Horn <b@horn.uk>
|
|
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
---
|
|
grub-core/net/net.c | 7 ++++---
|
|
grub-core/normal/main.c | 2 +-
|
|
include/grub/net.h | 2 +-
|
|
3 files changed, 6 insertions(+), 5 deletions(-)
|
|
|
|
diff --git a/grub-core/net/net.c b/grub-core/net/net.c
|
|
index 22221dc6a0..df13c3aaaa 100644
|
|
--- a/grub-core/net/net.c
|
|
+++ b/grub-core/net/net.c
|
|
@@ -1912,14 +1912,15 @@ grub_config_search_through (char *config, char *suffix,
|
|
}
|
|
|
|
grub_err_t
|
|
-grub_net_search_config_file (char *config)
|
|
+grub_net_search_config_file (char *config, grub_size_t config_buf_len)
|
|
{
|
|
- grub_size_t config_len;
|
|
+ grub_size_t config_len, suffix_len;
|
|
char *suffix;
|
|
|
|
config_len = grub_strlen (config);
|
|
config[config_len] = '-';
|
|
suffix = config + config_len + 1;
|
|
+ suffix_len = config_buf_len - (config_len + 1);
|
|
|
|
struct grub_net_network_level_interface *inf;
|
|
FOR_NET_NETWORK_LEVEL_INTERFACES (inf)
|
|
@@ -1945,7 +1946,7 @@ grub_net_search_config_file (char *config)
|
|
|
|
if (client_uuid)
|
|
{
|
|
- grub_strcpy (suffix, client_uuid);
|
|
+ grub_strlcpy (suffix, client_uuid, suffix_len);
|
|
if (grub_config_search_through (config, suffix, 1, 0) == 0)
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
|
|
index b08fd6977d..f2679c4378 100644
|
|
--- a/grub-core/normal/main.c
|
|
+++ b/grub-core/normal/main.c
|
|
@@ -451,7 +451,7 @@ grub_cmd_normal (struct grub_command *cmd __attribute__ ((unused)),
|
|
|
|
if (grub_strncmp (prefix + 1, "tftp", sizeof ("tftp") - 1) == 0 &&
|
|
!disable_net_search)
|
|
- grub_net_search_config_file (config);
|
|
+ grub_net_search_config_file (config, config_len);
|
|
|
|
grub_enter_normal_mode (config);
|
|
grub_free (config);
|
|
diff --git a/include/grub/net.h b/include/grub/net.h
|
|
index dfb089a35c..abb637eaa2 100644
|
|
--- a/include/grub/net.h
|
|
+++ b/include/grub/net.h
|
|
@@ -652,7 +652,7 @@ void
|
|
grub_net_remove_dns_server (const struct grub_net_network_level_address *s);
|
|
|
|
grub_err_t
|
|
-grub_net_search_config_file (char *config);
|
|
+grub_net_search_config_file (char *config, grub_size_t config_buf_len);
|
|
|
|
extern char *grub_net_default_server;
|
|
|
|
--
|
|
2.48.1
|
|
|