summaryrefslogtreecommitdiff
path: root/debian/patches/CVE-2017-7479.patch
diff options
context:
space:
mode:
Diffstat (limited to 'debian/patches/CVE-2017-7479.patch')
-rw-r--r--debian/patches/CVE-2017-7479.patch193
1 files changed, 0 insertions, 193 deletions
diff --git a/debian/patches/CVE-2017-7479.patch b/debian/patches/CVE-2017-7479.patch
deleted file mode 100644
index 9f75d31..0000000
--- a/debian/patches/CVE-2017-7479.patch
+++ /dev/null
@@ -1,193 +0,0 @@
-From ac08b27cfa693d9be592bb2597c260635aee9e68 Mon Sep 17 00:00:00 2001
-From: Steffan Karger <steffan.karger@fox-it.com>
-Date: Tue, 25 Apr 2017 10:00:44 +0200
-Subject: [PATCH 2/2] Drop packets instead of asserting out if packet id rolls
- over
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Previously, if a mode was selected where packet ids are not allowed to roll
-over, but renegotiation does not succeed for some reason (e.g. no password
-entered in time, certificate expired or a malicious peer that refuses the
-renegotiaion on purpose) we would continue to use the old keys. Until the
-packet ID would roll over and we would ASSERT() out.
-
-Given that this can be triggered on purpose by an authenticated peer, this
-is a fix for an authenticated remote DoS vulnerability. An attack is
-rather inefficient though; a peer would need to get us to send 2^32
-packets (min-size packet is IP+UDP+OPCODE+PID+TAG (no payload), results in
-(20+8+1+4+16)×2^32 bytes, or approx. 196 GB).
-
-Signed-off-by: Steffan Karger <steffan.karger@fox-it.com>
-
-CVE-2017-7479
-
----
- src/openvpn/crypto.c | 25 ++++++++++++++++---------
- src/openvpn/packet_id.c | 22 ++++++++++++++++------
- src/openvpn/packet_id.h | 1 +
- src/openvpn/tls_crypt.c | 6 +++++-
- tests/unit_tests/openvpn/test_packet_id.c | 11 +++++++++--
- 5 files changed, 47 insertions(+), 18 deletions(-)
-
-Index: openvpn-2.4.0/src/openvpn/crypto.c
-===================================================================
---- openvpn-2.4.0.orig/src/openvpn/crypto.c
-+++ openvpn-2.4.0/src/openvpn/crypto.c
-@@ -93,7 +93,11 @@ openvpn_encrypt_aead(struct buffer *buf,
- buf_set_write(&iv_buffer, iv, iv_len);
-
- /* IV starts with packet id to make the IV unique for packet */
-- ASSERT(packet_id_write(&opt->packet_id.send, &iv_buffer, false, false));
-+ if (!packet_id_write(&opt->packet_id.send, &iv_buffer, false, false))
-+ {
-+ msg(D_CRYPT_ERRORS, "ENCRYPT ERROR: packet ID roll over");
-+ goto err;
-+ }
-
- /* Remainder of IV consists of implicit part (unique per session) */
- ASSERT(buf_write(&iv_buffer, ctx->implicit_iv, ctx->implicit_iv_len));
-@@ -194,11 +198,13 @@ openvpn_encrypt_v1(struct buffer *buf, s
- }
-
- /* Put packet ID in plaintext buffer */
-- if (packet_id_initialized(&opt->packet_id))
-+ if (packet_id_initialized(&opt->packet_id)
-+ && !packet_id_write(&opt->packet_id.send, buf,
-+ opt->flags & CO_PACKET_ID_LONG_FORM,
-+ true))
- {
-- ASSERT(packet_id_write(&opt->packet_id.send, buf,
-- opt->flags & CO_PACKET_ID_LONG_FORM,
-- true));
-+ msg(D_CRYPT_ERRORS, "ENCRYPT ERROR: packet ID roll over");
-+ goto err;
- }
- }
- else if (cipher_kt_mode_ofb_cfb(cipher_kt))
-@@ -258,11 +264,12 @@ openvpn_encrypt_v1(struct buffer *buf, s
- }
- else /* No Encryption */
- {
-- if (packet_id_initialized(&opt->packet_id))
-+ if (packet_id_initialized(&opt->packet_id)
-+ && !packet_id_write(&opt->packet_id.send, buf,
-+ opt->flags & CO_PACKET_ID_LONG_FORM, true))
- {
-- ASSERT(packet_id_write(&opt->packet_id.send, buf,
-- BOOL_CAST(opt->flags & CO_PACKET_ID_LONG_FORM),
-- true));
-+ msg(D_CRYPT_ERRORS, "ENCRYPT ERROR: packet ID roll over");
-+ goto err;
- }
- if (ctx->hmac)
- {
-Index: openvpn-2.4.0/src/openvpn/packet_id.c
-===================================================================
---- openvpn-2.4.0.orig/src/openvpn/packet_id.c
-+++ openvpn-2.4.0/src/openvpn/packet_id.c
-@@ -325,27 +325,37 @@ packet_id_read(struct packet_id_net *pin
- return true;
- }
-
--static void
-+static bool
- packet_id_send_update(struct packet_id_send *p, bool long_form)
- {
- if (!p->time)
- {
- p->time = now;
- }
-- p->id++;
-- if (!p->id)
-+ if (p->id == PACKET_ID_MAX)
- {
-- ASSERT(long_form);
-+ /* Packet ID only allowed to roll over if using long form and time has
-+ * moved forward since last roll over.
-+ */
-+ if (!long_form || now <= p->time)
-+ {
-+ return false;
-+ }
- p->time = now;
-- p->id = 1;
-+ p->id = 0;
- }
-+ p->id++;
-+ return true;
- }
-
- bool
- packet_id_write(struct packet_id_send *p, struct buffer *buf, bool long_form,
- bool prepend)
- {
-- packet_id_send_update(p, long_form);
-+ if (!packet_id_send_update(p, long_form))
-+ {
-+ return false;
-+ }
-
- const packet_id_type net_id = htonpid(p->id);
- const net_time_t net_time = htontime(p->time);
-Index: openvpn-2.4.0/src/openvpn/packet_id.h
-===================================================================
---- openvpn-2.4.0.orig/src/openvpn/packet_id.h
-+++ openvpn-2.4.0/src/openvpn/packet_id.h
-@@ -50,6 +50,7 @@
- * to for network transmission.
- */
- typedef uint32_t packet_id_type;
-+#define PACKET_ID_MAX UINT32_MAX
- typedef uint32_t net_time_t;
-
- /*
-Index: openvpn-2.4.0/src/openvpn/tls_crypt.c
-===================================================================
---- openvpn-2.4.0.orig/src/openvpn/tls_crypt.c
-+++ openvpn-2.4.0/src/openvpn/tls_crypt.c
-@@ -95,7 +95,11 @@ tls_crypt_wrap(const struct buffer *src,
- format_hex(BPTR(src), BLEN(src), 80, &gc));
-
- /* Get packet ID */
-- ASSERT(packet_id_write(&opt->packet_id.send, dst, true, false));
-+ if (!packet_id_write(&opt->packet_id.send, dst, true, false))
-+ {
-+ msg(D_CRYPT_ERRORS, "TLS-CRYPT ERROR: packet ID roll over.");
-+ goto err;
-+ }
-
- dmsg(D_PACKET_CONTENT, "TLS-CRYPT WRAP AD: %s",
- format_hex(BPTR(dst), BLEN(dst), 0, &gc));
-Index: openvpn-2.4.0/tests/unit_tests/openvpn/test_packet_id.c
-===================================================================
---- openvpn-2.4.0.orig/tests/unit_tests/openvpn/test_packet_id.c
-+++ openvpn-2.4.0/tests/unit_tests/openvpn/test_packet_id.c
-@@ -129,8 +129,7 @@ test_packet_id_write_short_wrap(void **s
- struct test_packet_id_write_data *data = *state;
-
- data->pis.id = ~0;
-- expect_assert_failure(
-- packet_id_write(&data->pis, &data->test_buf, false, false));
-+ assert_false(packet_id_write(&data->pis, &data->test_buf, false, false));
- }
-
- static void
-@@ -139,8 +138,16 @@ test_packet_id_write_long_wrap(void **st
- struct test_packet_id_write_data *data = *state;
-
- data->pis.id = ~0;
-+ data->pis.time = 5006;
-+
-+ /* Write fails if time did not change */
-+ now = 5006;
-+ assert_false(packet_id_write(&data->pis, &data->test_buf, true, false));
-+
-+ /* Write succeeds if time moved forward */
- now = 5010;
- assert_true(packet_id_write(&data->pis, &data->test_buf, true, false));
-+
- assert(data->pis.id == 1);
- assert(data->pis.time == now);
- assert_true(data->test_buf_data.buf_id == htonl(1));
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-08 21:32:51 +0000