[OE-core] [PATCH] Security Advisory - pam - CVE-2014-2583
wenzong.fan at windriver.com
wenzong.fan at windriver.com
Mon Jun 16 03:29:48 UTC 2014
From: Yue Tao <Yue.Tao at windriver.com>
Multiple directory traversal vulnerabilities in pam_timestamp.c in the
pam_timestamp module for Linux-PAM (aka pam) 1.1.8 allow local users to
create aribitrary files or possibly bypass authentication via a .. (dot
dot) in the (1) PAM_RUSER value to the get_ruser function or (2) PAM_TTY
value to the check_tty funtion, which is used by the
format_timestamp_name function.
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-2583
Signed-off-by: Yue Tao <Yue.Tao at windriver.com>
---
...mp-fix-potential-directory-traversal-issu.patch | 58 ++++++++++++++++++++
meta/recipes-extended/pam/libpam_1.1.6.bb | 1 +
2 files changed, 59 insertions(+)
create mode 100644 meta/recipes-extended/pam/libpam/0001-pam_timestamp-fix-potential-directory-traversal-issu.patch
diff --git a/meta/recipes-extended/pam/libpam/0001-pam_timestamp-fix-potential-directory-traversal-issu.patch b/meta/recipes-extended/pam/libpam/0001-pam_timestamp-fix-potential-directory-traversal-issu.patch
new file mode 100644
index 0000000..e9e9990
--- /dev/null
+++ b/meta/recipes-extended/pam/libpam/0001-pam_timestamp-fix-potential-directory-traversal-issu.patch
@@ -0,0 +1,58 @@
+From 9dcead87e6d7f66d34e7a56d11a30daca367dffb Mon Sep 17 00:00:00 2001
+From: "Dmitry V. Levin" <ldv at altlinux.org>
+Date: Wed, 26 Mar 2014 22:17:23 +0000
+Subject: [PATCH] pam_timestamp: fix potential directory traversal issue
+ (ticket #27)
+
+commit 9dcead87e6d7f66d34e7a56d11a30daca367dffb upstream
+
+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 at suse.de>
+---
+ modules/pam_timestamp/pam_timestamp.c | 13 ++++++++++++-
+ 1 files changed, 12 insertions(+), 1 deletions(-)
+
+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';
+--
+1.7.5.4
+
diff --git a/meta/recipes-extended/pam/libpam_1.1.6.bb b/meta/recipes-extended/pam/libpam_1.1.6.bb
index 7e55adf..4ca6063 100644
--- a/meta/recipes-extended/pam/libpam_1.1.6.bb
+++ b/meta/recipes-extended/pam/libpam_1.1.6.bb
@@ -25,6 +25,7 @@ SRC_URI = "http://linux-pam.org/library/Linux-PAM-${PV}.tar.bz2 \
file://libpam-fix-for-CVE-2010-4708.patch \
file://pam-security-abstract-securetty-handling.patch \
file://pam-unix-nullok-secure.patch \
+ file://0001-pam_timestamp-fix-potential-directory-traversal-issu.patch \
"
SRC_URI[md5sum] = "7b73e58b7ce79ffa321d408de06db2c4"
SRC_URI[sha256sum] = "bab887d6280f47fc3963df3b95735a27a16f0f663636163ddf3acab5f1149fc2"
--
1.7.9.5
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