* [PATCH 1/1] openssh: fix CVE-2016-6515
2016-08-23 1:59 [PATCH 0/1] openssh: fix CVE-2016-6515 kai.kang
@ 2016-08-23 1:59 ` kai.kang
2016-08-23 16:33 ` Burton, Ross
0 siblings, 1 reply; 4+ messages in thread
From: kai.kang @ 2016-08-23 1:59 UTC (permalink / raw)
To: openembedded-core
From: Kai Kang <kai.kang@windriver.com>
Backport patch to fix CVE-2016-6515 from:
https://anongit.mindrot.org/openssh.git/commit/?id=fcd135c
Signed-off-by: Kai Kang <kai.kang@windriver.com>
---
.../openssh/openssh/fix-CVE-2016-6515.patch | 57 ++++++++++++++++++++++
meta/recipes-connectivity/openssh/openssh_7.2p2.bb | 1 +
2 files changed, 58 insertions(+)
create mode 100644 meta/recipes-connectivity/openssh/openssh/fix-CVE-2016-6515.patch
diff --git a/meta/recipes-connectivity/openssh/openssh/fix-CVE-2016-6515.patch b/meta/recipes-connectivity/openssh/openssh/fix-CVE-2016-6515.patch
new file mode 100644
index 0000000..466d572
--- /dev/null
+++ b/meta/recipes-connectivity/openssh/openssh/fix-CVE-2016-6515.patch
@@ -0,0 +1,57 @@
+Upstream-Status: Backport
+
+Backport patch to fix CVE-2016-6515 from:
+
+https://anongit.mindrot.org/openssh.git/commit/?id=fcd135c
+
+Signed-off-by: Kai Kang <kai.kang@windriver.com>
+---
+From fcd135c9df440bcd2d5870405ad3311743d78d97 Mon Sep 17 00:00:00 2001
+From: "dtucker@openbsd.org" <dtucker@openbsd.org>
+Date: Thu, 21 Jul 2016 01:39:35 +0000
+Subject: upstream commit
+
+Skip passwords longer than 1k in length so clients can't
+easily DoS sshd by sending very long passwords, causing it to spend CPU
+hashing them. feedback djm@, ok markus@.
+
+Brought to our attention by tomas.kuthan at oracle.com, shilei-c at
+360.cn and coredump at autistici.org
+
+Upstream-ID: d0af7d4a2190b63ba1d38eec502bc4be0be9e333
+---
+ auth-passwd.c | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/auth-passwd.c b/auth-passwd.c
+index 530b5d4..996c2cf 100644
+--- a/auth-passwd.c
++++ b/auth-passwd.c
+@@ -1,4 +1,4 @@
+-/* $OpenBSD: auth-passwd.c,v 1.44 2014/07/15 15:54:14 millert Exp $ */
++/* $OpenBSD: auth-passwd.c,v 1.45 2016/07/21 01:39:35 dtucker Exp $ */
+ /*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+@@ -66,6 +66,8 @@ extern login_cap_t *lc;
+ #define DAY (24L * 60 * 60) /* 1 day in seconds */
+ #define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */
+
++#define MAX_PASSWORD_LEN 1024
++
+ void
+ disable_forwarding(void)
+ {
+@@ -87,6 +89,9 @@ auth_password(Authctxt *authctxt, const char *password)
+ static int expire_checked = 0;
+ #endif
+
++ if (strlen(password) > MAX_PASSWORD_LEN)
++ return 0;
++
+ #ifndef HAVE_CYGWIN
+ if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
+ ok = 0;
+--
+cgit v0.12
+
diff --git a/meta/recipes-connectivity/openssh/openssh_7.2p2.bb b/meta/recipes-connectivity/openssh/openssh_7.2p2.bb
index 3df825b..d48c5fb 100644
--- a/meta/recipes-connectivity/openssh/openssh_7.2p2.bb
+++ b/meta/recipes-connectivity/openssh/openssh_7.2p2.bb
@@ -25,6 +25,7 @@ SRC_URI = "http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-${PV}.tar
file://CVE-2015-8325.patch \
file://openssh-7.1p1-conditional-compile-des-in-cipher.patch \
file://openssh-7.1p1-conditional-compile-des-in-pkcs11.patch \
+ file://fix-CVE-2016-6515.patch \
"
PAM_SRC_URI = "file://sshd"
--
2.9.3
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