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From 2e94b6ec10f1d15e24867bab3063bb85f173406a Mon Sep 17 00:00:00 2001
From: Jeremy Allison <jra@samba.org>
Date: Thu, 9 Jul 2015 10:58:11 -0700
Subject: [PATCH] CVE-2015-5252: s3: smbd: Fix symlink verification (file
access outside the share).
Ensure matching component ends in '/' or '\0'.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11395
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
---
source3/smbd/vfs.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/source3/smbd/vfs.c
+++ b/source3/smbd/vfs.c
@@ -982,6 +982,7 @@ NTSTATUS check_reduced_name(connection_s
if (!allow_widelinks || !allow_symlinks) {
const char *conn_rootdir;
size_t rootdir_len;
+ bool matched;
conn_rootdir = SMB_VFS_CONNECTPATH(conn, fname);
if (conn_rootdir == NULL) {
@@ -992,8 +993,10 @@ NTSTATUS check_reduced_name(connection_s
}
rootdir_len = strlen(conn_rootdir);
- if (strncmp(conn_rootdir, resolved_name,
- rootdir_len) != 0) {
+ matched = (strncmp(conn_rootdir, resolved_name,
+ rootdir_len) == 0);
+ if (!matched || (resolved_name[rootdir_len] != '/' &&
+ resolved_name[rootdir_len] != '\0')) {
DEBUG(2, ("check_reduced_name: Bad access "
"attempt: %s is a symlink outside the "
"share path\n", fname));
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