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busybox: fix CVE-2018-20679, CVE-2019-5747

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closes #7663
This commit is contained in:
Christian Buschau 2019-01-24 12:06:23 +01:00 committed by maxice8
parent c82951d8a5
commit 3f4ffff073
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GPG key ID: 543B9D4F4299F06B
3 changed files with 180 additions and 2 deletions
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128
srcpkgs/busybox/patches/CVE-2018-20679.patch Normal file
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@ -0,0 +1,128 @@
commit 6d3b4bb24da9a07c263f3c1acf8df85382ff562c
Author: Denys Vlasenko <vda.linux@googlemail.com>
Date: Mon Dec 17 18:07:18 2018 +0100
udhcpc: check that 4-byte options are indeed 4-byte, closes 11506
function old new delta
udhcp_get_option32 - 27 +27
udhcp_get_option 231 248 +17
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/0 up/down: 44/0) Total: 44 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git networking/udhcp/common.c networking/udhcp/common.c
index e5fd74f91..41b05b855 100644
--- networking/udhcp/common.c
+++ networking/udhcp/common.c
@@ -272,6 +272,15 @@ uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
goto complain; /* complain and return NULL */
if (optionptr[OPT_CODE] == code) {
+ if (optionptr[OPT_LEN] == 0) {
+ /* So far no valid option with length 0 known.
+ * Having this check means that searching
+ * for DHCP_MESSAGE_TYPE need not worry
+ * that returned pointer might be unsafe
+ * to dereference.
+ */
+ goto complain; /* complain and return NULL */
+ }
log_option("option found", optionptr);
return optionptr + OPT_DATA;
}
@@ -289,6 +298,16 @@ uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
return NULL;
}
+uint8_t* FAST_FUNC udhcp_get_option32(struct dhcp_packet *packet, int code)
+{
+ uint8_t *r = udhcp_get_option(packet, code);
+ if (r) {
+ if (r[-1] != 4)
+ r = NULL;
+ }
+ return r;
+}
+
/* Return the position of the 'end' option (no bounds checking) */
int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
{
diff --git networking/udhcp/common.h networking/udhcp/common.h
index 7ad603d33..9511152ff 100644
--- networking/udhcp/common.h
+++ networking/udhcp/common.h
@@ -205,6 +205,10 @@ extern const uint8_t dhcp_option_lengths[] ALIGN1;
unsigned FAST_FUNC udhcp_option_idx(const char *name, const char *option_strings);
uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
+/* Same as above + ensures that option length is 4 bytes
+ * (returns NULL if size is different)
+ */
+uint8_t *udhcp_get_option32(struct dhcp_packet *packet, int code) FAST_FUNC;
int udhcp_end_option(uint8_t *optionptr) FAST_FUNC;
void udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt) FAST_FUNC;
#if ENABLE_UDHCPC || ENABLE_UDHCPD
diff --git networking/udhcp/dhcpc.c networking/udhcp/dhcpc.c
index 4b23e4d39..5b3fd531c 100644
--- networking/udhcp/dhcpc.c
+++ networking/udhcp/dhcpc.c
@@ -1691,7 +1691,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
* They say ISC DHCP client supports this case.
*/
server_addr = 0;
- temp = udhcp_get_option(&packet, DHCP_SERVER_ID);
+ temp = udhcp_get_option32(&packet, DHCP_SERVER_ID);
if (!temp) {
bb_error_msg("no server ID, using 0.0.0.0");
} else {
@@ -1718,7 +1718,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
struct in_addr temp_addr;
uint8_t *temp;
- temp = udhcp_get_option(&packet, DHCP_LEASE_TIME);
+ temp = udhcp_get_option32(&packet, DHCP_LEASE_TIME);
if (!temp) {
bb_error_msg("no lease time with ACK, using 1 hour lease");
lease_seconds = 60 * 60;
@@ -1813,7 +1813,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
uint32_t svid;
uint8_t *temp;
- temp = udhcp_get_option(&packet, DHCP_SERVER_ID);
+ temp = udhcp_get_option32(&packet, DHCP_SERVER_ID);
if (!temp) {
non_matching_svid:
log1("received DHCP NAK with wrong"
diff --git networking/udhcp/dhcpd.c networking/udhcp/dhcpd.c
index a8cd3f03b..477856d11 100644
--- networking/udhcp/dhcpd.c
+++ networking/udhcp/dhcpd.c
@@ -640,7 +640,7 @@ static void add_server_options(struct dhcp_packet *packet)
static uint32_t select_lease_time(struct dhcp_packet *packet)
{
uint32_t lease_time_sec = server_config.max_lease_sec;
- uint8_t *lease_time_opt = udhcp_get_option(packet, DHCP_LEASE_TIME);
+ uint8_t *lease_time_opt = udhcp_get_option32(packet, DHCP_LEASE_TIME);
if (lease_time_opt) {
move_from_unaligned32(lease_time_sec, lease_time_opt);
lease_time_sec = ntohl(lease_time_sec);
@@ -987,7 +987,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
}
/* Get SERVER_ID if present */
- server_id_opt = udhcp_get_option(&packet, DHCP_SERVER_ID);
+ server_id_opt = udhcp_get_option32(&packet, DHCP_SERVER_ID);
if (server_id_opt) {
uint32_t server_id_network_order;
move_from_unaligned32(server_id_network_order, server_id_opt);
@@ -1011,7 +1011,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
}
/* Get REQUESTED_IP if present */
- requested_ip_opt = udhcp_get_option(&packet, DHCP_REQUESTED_IP);
+ requested_ip_opt = udhcp_get_option32(&packet, DHCP_REQUESTED_IP);
if (requested_ip_opt) {
move_from_unaligned32(requested_nip, requested_ip_opt);
}

50
srcpkgs/busybox/patches/CVE-2019-5747.patch Normal file
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@ -0,0 +1,50 @@
commit 74d9f1ba37010face4bd1449df4d60dd84450b06
Author: Denys Vlasenko <vda.linux@googlemail.com>
Date: Mon Jan 7 15:33:42 2019 +0100
udhcpc: when decoding DHCP_SUBNET, ensure it is 4 bytes long
function old new delta
udhcp_run_script 795 801 +6
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git networking/udhcp/common.c networking/udhcp/common.c
index 4c2221b77..fc4de5716 100644
--- networking/udhcp/common.c
+++ networking/udhcp/common.c
@@ -302,7 +302,7 @@ uint8_t* FAST_FUNC udhcp_get_option32(struct dhcp_packet *packet, int code)
{
uint8_t *r = udhcp_get_option(packet, code);
if (r) {
- if (r[-1] != 4)
+ if (r[-OPT_DATA + OPT_LEN] != 4)
r = NULL;
}
return r;
diff --git networking/udhcp/common.h networking/udhcp/common.h
index 9511152ff..62f9a2a4a 100644
--- networking/udhcp/common.h
+++ networking/udhcp/common.h
@@ -119,7 +119,7 @@ enum {
//#define DHCP_TIME_SERVER 0x04 /* RFC 868 time server (32-bit, 0 = 1.1.1900) */
//#define DHCP_NAME_SERVER 0x05 /* IEN 116 _really_ ancient kind of NS */
//#define DHCP_DNS_SERVER 0x06
-//#define DHCP_LOG_SERVER 0x07 /* port 704 UDP log (not syslog)
+//#define DHCP_LOG_SERVER 0x07 /* port 704 UDP log (not syslog) */
//#define DHCP_COOKIE_SERVER 0x08 /* "quote of the day" server */
//#define DHCP_LPR_SERVER 0x09
#define DHCP_HOST_NAME 0x0c /* 12: either client informs server or server gives name to client */
diff --git networking/udhcp/dhcpc.c networking/udhcp/dhcpc.c
index 5b3fd531c..dcec8cdfd 100644
--- networking/udhcp/dhcpc.c
+++ networking/udhcp/dhcpc.c
@@ -531,7 +531,7 @@ static char **fill_envp(struct dhcp_packet *packet)
temp = udhcp_get_option(packet, code);
*curr = xmalloc_optname_optval(temp, &dhcp_optflags[i], opt_name);
putenv(*curr++);
- if (code == DHCP_SUBNET) {
+ if (code == DHCP_SUBNET && temp[-OPT_DATA + OPT_LEN] == 4) {
/* Subnet option: make things like "$ip/$mask" possible */
uint32_t subnet;
move_from_unaligned32(subnet, temp);

4
srcpkgs/busybox/template
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@ -1,10 +1,10 @@
# Template file for 'busybox'
pkgname=busybox
version=1.29.3
revision=1
revision=2
hostmakedepends="perl"
checkdepends="zip"
short_desc="The Swiss Army Knife of Embedded Linux"
short_desc="Swiss Army Knife of Embedded Linux"
maintainer="Juan RP <xtraeme@voidlinux.org>"
license="GPL-2.0-only"
homepage="http://www.busybox.net"