c165b0e580
To fix: CVE-2013-7041 - use case sensitive comparison in pam_userdb CVE-2014-2583 - potential path traversal issue in pam_timestamp Also add hash file (computed, the hash files upstream cover up to 1.1.7) Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
54 lines
1.7 KiB
Diff
54 lines
1.7 KiB
Diff
From 9dcead87e6d7f66d34e7a56d11a30daca367dffb Mon Sep 17 00:00:00 2001
|
|
From: "Dmitry V. Levin" <ldv@altlinux.org>
|
|
Date: Wed, 26 Mar 2014 22:17:23 +0000
|
|
Subject: pam_timestamp: fix potential directory traversal issue (ticket #27)
|
|
|
|
pam_timestamp uses values of PAM_RUSER and PAM_TTY as components of
|
|
the timestamp pathname it creates, so extra care should be taken to
|
|
avoid potential directory traversal issues.
|
|
|
|
* modules/pam_timestamp/pam_timestamp.c (check_tty): Treat
|
|
"." and ".." tty values as invalid.
|
|
(get_ruser): Treat "." and ".." ruser values, as well as any ruser
|
|
value containing '/', as invalid.
|
|
|
|
Fixes CVE-2014-2583.
|
|
|
|
Reported-by: Sebastian Krahmer <krahmer@suse.de>
|
|
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
|
|
|
|
diff --git a/modules/pam_timestamp/pam_timestamp.c b/modules/pam_timestamp/pam_timestamp.c
|
|
index 5193733..b3f08b1 100644
|
|
--- a/modules/pam_timestamp/pam_timestamp.c
|
|
+++ b/modules/pam_timestamp/pam_timestamp.c
|
|
@@ -158,7 +158,7 @@ check_tty(const char *tty)
|
|
tty = strrchr(tty, '/') + 1;
|
|
}
|
|
/* Make sure the tty wasn't actually a directory (no basename). */
|
|
- if (strlen(tty) == 0) {
|
|
+ if (!strlen(tty) || !strcmp(tty, ".") || !strcmp(tty, "..")) {
|
|
return NULL;
|
|
}
|
|
return tty;
|
|
@@ -243,6 +243,17 @@ get_ruser(pam_handle_t *pamh, char *ruserbuf, size_t ruserbuflen)
|
|
if (pwd != NULL) {
|
|
ruser = pwd->pw_name;
|
|
}
|
|
+ } else {
|
|
+ /*
|
|
+ * This ruser is used by format_timestamp_name as a component
|
|
+ * of constructed timestamp pathname, so ".", "..", and '/'
|
|
+ * are disallowed to avoid potential path traversal issues.
|
|
+ */
|
|
+ if (!strcmp(ruser, ".") ||
|
|
+ !strcmp(ruser, "..") ||
|
|
+ strchr(ruser, '/')) {
|
|
+ ruser = NULL;
|
|
+ }
|
|
}
|
|
if (ruser == NULL || strlen(ruser) >= ruserbuflen) {
|
|
*ruserbuf = '\0';
|
|
--
|
|
cgit v0.10.2
|
|
|