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- Fix CVE-2014-2583: pam_timestamp path injection (bnc#870433)

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bug-870433_pam_timestamp-fix-directory-traversal.patch

OBS-URL: https://build.opensuse.org/package/show/Linux-PAM/pam?expand=0&rev=139
This commit is contained in:
Christian Kornacker 2014-04-09 16:56:48 +00:00 committed by Git OBS Bridge
parent 00a548aec5
commit 9b92f7495c
3 changed files with 61 additions and 0 deletions
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53
bug-870433_pam_timestamp-fix-directory-traversal.patch Normal file
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@ -0,0 +1,53 @@
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: [PATCH] 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>
---
modules/pam_timestamp/pam_timestamp.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
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';

6
pam.changes
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@ -1,3 +1,9 @@
-------------------------------------------------------------------
Wed Apr 9 16:02:17 UTC 2014 - ckornacker@suse.com
- Fix CVE-2014-2583: pam_timestamp path injection (bnc#870433)
bug-870433_pam_timestamp-fix-directory-traversal.patch
-------------------------------------------------------------------
Tue Apr 1 15:35:56 UTC 2014 - ckornacker@suse.com

2
pam.spec
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@ -55,6 +55,7 @@ Patch0: fix-man-links.dif
Patch1: Linux-PAM-git-20140127.diff
Patch2: pam_loginuid-log_write_errors.diff
Patch3: pam_xauth-sigpipe.diff
Patch4: bug-870433_pam_timestamp-fix-directory-traversal.patch
BuildRoot: %{_tmppath}/%{name}-%{version}-build
%description
@ -102,6 +103,7 @@ building both PAM-aware applications and modules for use with PAM.
%patch1 -p2
%patch2 -p1
%patch3 -p1
%patch4 -p1
%build
export CFLAGS="%optflags -DNDEBUG"