130 lines
4.8 KiB
Diff
130 lines
4.8 KiB
Diff
From e5835352b8dd5b8717fc8fccc6573851c33c6533 Mon Sep 17 00:00:00 2001
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From: zhangchenfeng <zhangchenfeng1@huawei.com>
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Date: Fri, 1 Mar 2019 10:24:02 +0800
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Subject: [PATCH 1/2] fix CVE-2018-20679
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---
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networking/udhcp/common.c | 19 +++++++++++++++++++
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networking/udhcp/common.h | 4 ++++
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networking/udhcp/dhcpc.c | 6 +++---
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networking/udhcp/dhcpd.c | 6 +++---
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4 files changed, 29 insertions(+), 6 deletions(-)
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diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
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index 52ef875..074e28d 100644
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--- a/networking/udhcp/common.c
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+++ b/networking/udhcp/common.c
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@@ -270,6 +270,15 @@ uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
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goto complain; /* complain and return NULL */
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if (optionptr[OPT_CODE] == code) {
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+ if (optionptr[OPT_LEN] == 0) {
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+ /* So far no valid option with length 0 known.
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+ * Having this check means that searching
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+ * for DHCP_MESSAGE_TYPE need not worry
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+ * that returned pointer might be unsafe
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+ * to dereference.
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+ */
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+ goto complain; /* complain and return NULL */
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+ }
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log_option("option found", optionptr);
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return optionptr + OPT_DATA;
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}
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@@ -287,6 +296,16 @@ uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
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return NULL;
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}
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+uint8_t* FAST_FUNC udhcp_get_option32(struct dhcp_packet *packet, int code)
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+{
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+ uint8_t *r = udhcp_get_option(packet, code);
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+ if (r) {
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+ if (r[-1] != 4)
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+ r = NULL;
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+ }
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+ return r;
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+}
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+
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/* Return the position of the 'end' option (no bounds checking) */
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int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
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{
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diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
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index 50ea919..1d694ad 100644
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--- a/networking/udhcp/common.h
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+++ b/networking/udhcp/common.h
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@@ -204,6 +204,10 @@ extern const uint8_t dhcp_option_lengths[] ALIGN1;
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unsigned FAST_FUNC udhcp_option_idx(const char *name, const char *option_strings);
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uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
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+/* Same as above + ensures that option length is 4 bytes
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+ * (returns NULL if size is different)
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+ */
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+uint8_t *udhcp_get_option32(struct dhcp_packet *packet, int code) FAST_FUNC;
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int udhcp_end_option(uint8_t *optionptr) FAST_FUNC;
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void udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt) FAST_FUNC;
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#if ENABLE_UDHCPC || ENABLE_UDHCPD
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diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
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index c2805a0..57f1966 100644
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--- a/networking/udhcp/dhcpc.c
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+++ b/networking/udhcp/dhcpc.c
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@@ -1683,7 +1683,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
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* They say ISC DHCP client supports this case.
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*/
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server_addr = 0;
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- temp = udhcp_get_option(&packet, DHCP_SERVER_ID);
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+ temp = udhcp_get_option32(&packet, DHCP_SERVER_ID);
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if (!temp) {
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bb_error_msg("no server ID, using 0.0.0.0");
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} else {
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@@ -1710,7 +1710,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
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struct in_addr temp_addr;
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uint8_t *temp;
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- temp = udhcp_get_option(&packet, DHCP_LEASE_TIME);
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+ temp = udhcp_get_option32(&packet, DHCP_LEASE_TIME);
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if (!temp) {
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bb_error_msg("no lease time with ACK, using 1 hour lease");
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lease_seconds = 60 * 60;
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@@ -1804,7 +1804,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
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uint32_t svid;
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uint8_t *temp;
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- temp = udhcp_get_option(&packet, DHCP_SERVER_ID);
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+ temp = udhcp_get_option32(&packet, DHCP_SERVER_ID);
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if (!temp) {
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non_matching_svid:
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log1("received DHCP NAK with wrong"
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diff --git a/networking/udhcp/dhcpd.c b/networking/udhcp/dhcpd.c
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index a8cd3f0..477856d 100644
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--- a/networking/udhcp/dhcpd.c
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+++ b/networking/udhcp/dhcpd.c
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@@ -640,7 +640,7 @@ static void add_server_options(struct dhcp_packet *packet)
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static uint32_t select_lease_time(struct dhcp_packet *packet)
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{
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uint32_t lease_time_sec = server_config.max_lease_sec;
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- uint8_t *lease_time_opt = udhcp_get_option(packet, DHCP_LEASE_TIME);
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+ uint8_t *lease_time_opt = udhcp_get_option32(packet, DHCP_LEASE_TIME);
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if (lease_time_opt) {
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move_from_unaligned32(lease_time_sec, lease_time_opt);
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lease_time_sec = ntohl(lease_time_sec);
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@@ -987,7 +987,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
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}
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/* Get SERVER_ID if present */
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- server_id_opt = udhcp_get_option(&packet, DHCP_SERVER_ID);
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+ server_id_opt = udhcp_get_option32(&packet, DHCP_SERVER_ID);
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if (server_id_opt) {
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uint32_t server_id_network_order;
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move_from_unaligned32(server_id_network_order, server_id_opt);
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@@ -1011,7 +1011,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
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}
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/* Get REQUESTED_IP if present */
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- requested_ip_opt = udhcp_get_option(&packet, DHCP_REQUESTED_IP);
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+ requested_ip_opt = udhcp_get_option32(&packet, DHCP_REQUESTED_IP);
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if (requested_ip_opt) {
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move_from_unaligned32(requested_nip, requested_ip_opt);
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}
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--
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1.8.3.1
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