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-rw-r--r--package/busybox/patches/006-upstream_CVE-2011-2716_fixes.patch164
1 files changed, 164 insertions, 0 deletions
diff --git a/package/busybox/patches/006-upstream_CVE-2011-2716_fixes.patch b/package/busybox/patches/006-upstream_CVE-2011-2716_fixes.patch
new file mode 100644
index 0000000000..94d5f34a16
--- /dev/null
+++ b/package/busybox/patches/006-upstream_CVE-2011-2716_fixes.patch
@@ -0,0 +1,164 @@
+--- busybox-1.19.4/networking/udhcp/common.c
++++ busybox-1.19.4-udhcp/networking/udhcp/common.c
+@@ -29,16 +29,16 @@ const struct dhcp_optflag dhcp_optflags[
+ // { OPTION_IP | OPTION_LIST , 0x07 }, /* DHCP_LOG_SERVER */
+ // { OPTION_IP | OPTION_LIST , 0x08 }, /* DHCP_COOKIE_SERVER */
+ { OPTION_IP | OPTION_LIST , 0x09 }, /* DHCP_LPR_SERVER */
+- { OPTION_STRING | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME */
++ { OPTION_STRING_HOST | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME */
+ { OPTION_U16 , 0x0d }, /* DHCP_BOOT_SIZE */
+- { OPTION_STRING | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME */
++ { OPTION_STRING_HOST | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME */
+ { OPTION_IP , 0x10 }, /* DHCP_SWAP_SERVER */
+ { OPTION_STRING , 0x11 }, /* DHCP_ROOT_PATH */
+ { OPTION_U8 , 0x17 }, /* DHCP_IP_TTL */
+ { OPTION_U16 , 0x1a }, /* DHCP_MTU */
+ { OPTION_IP | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST */
+ { OPTION_IP_PAIR | OPTION_LIST , 0x21 }, /* DHCP_ROUTES */
+- { OPTION_STRING , 0x28 }, /* DHCP_NIS_DOMAIN */
++ { OPTION_STRING_HOST , 0x28 }, /* DHCP_NIS_DOMAIN */
+ { OPTION_IP | OPTION_LIST , 0x29 }, /* DHCP_NIS_SERVER */
+ { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a }, /* DHCP_NTP_SERVER */
+ { OPTION_IP | OPTION_LIST , 0x2c }, /* DHCP_WINS_SERVER */
+@@ -46,7 +46,7 @@ const struct dhcp_optflag dhcp_optflags[
+ { OPTION_IP , 0x36 }, /* DHCP_SERVER_ID */
+ { OPTION_STRING , 0x38 }, /* DHCP_ERR_MESSAGE */
+ //TODO: must be combined with 'sname' and 'file' handling:
+- { OPTION_STRING , 0x42 }, /* DHCP_TFTP_SERVER_NAME */
++ { OPTION_STRING_HOST , 0x42 }, /* DHCP_TFTP_SERVER_NAME */
+ { OPTION_STRING , 0x43 }, /* DHCP_BOOT_FILE */
+ //TODO: not a string, but a set of LASCII strings:
+ // { OPTION_STRING , 0x4D }, /* DHCP_USER_CLASS */
+@@ -143,6 +143,7 @@ const uint8_t dhcp_option_lengths[] ALIG
+ [OPTION_IP_PAIR] = 8,
+ // [OPTION_BOOLEAN] = 1,
+ [OPTION_STRING] = 1, /* ignored by udhcp_str2optset */
++ [OPTION_STRING_HOST] = 1, /* ignored by udhcp_str2optset */
+ #if ENABLE_FEATURE_UDHCP_RFC3397
+ [OPTION_DNS_STRING] = 1, /* ignored by both udhcp_str2optset and xmalloc_optname_optval */
+ [OPTION_SIP_SERVERS] = 1,
+@@ -411,7 +412,9 @@ static NOINLINE void attach_option(
+ /* actually 255 is ok too, but adding a space can overlow it */
+
+ existing->data = xrealloc(existing->data, OPT_DATA + 1 + old_len + length);
+- if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING) {
++ if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING
++ || (optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING_HOST
++ ) {
+ /* add space separator between STRING options in a list */
+ existing->data[OPT_DATA + old_len] = ' ';
+ old_len++;
+@@ -475,6 +478,7 @@ int FAST_FUNC udhcp_str2optset(const cha
+ retval = udhcp_str2nip(val, buffer + 4);
+ break;
+ case OPTION_STRING:
++ case OPTION_STRING_HOST:
+ #if ENABLE_FEATURE_UDHCP_RFC3397
+ case OPTION_DNS_STRING:
+ #endif
+--- busybox-1.19.4/networking/udhcp/common.h
++++ busybox-1.19.4-udhcp/networking/udhcp/common.h
+@@ -80,6 +80,9 @@ enum {
+ OPTION_IP = 1,
+ OPTION_IP_PAIR,
+ OPTION_STRING,
++ /* Opts of STRING_HOST type will be sanitized before they are passed
++ * to udhcpc script's environment: */
++ OPTION_STRING_HOST,
+ // OPTION_BOOLEAN,
+ OPTION_U8,
+ OPTION_U16,
+--- busybox-1.19.4/networking/udhcp/dhcpc.c
++++ busybox-1.19.4-udhcp/networking/udhcp/dhcpc.c
+@@ -101,6 +101,7 @@ static const uint8_t len_of_option_as_st
+ [OPTION_IP_PAIR ] = sizeof("255.255.255.255 ") * 2,
+ [OPTION_STATIC_ROUTES ] = sizeof("255.255.255.255/32 255.255.255.255 "),
+ [OPTION_STRING ] = 1,
++ [OPTION_STRING_HOST ] = 1,
+ #if ENABLE_FEATURE_UDHCP_RFC3397
+ [OPTION_DNS_STRING ] = 1, /* unused */
+ /* Hmmm, this severely overestimates size if SIP_SERVERS option
+@@ -135,6 +136,63 @@ static int mton(uint32_t mask)
+ return i;
+ }
+
++/* Check if a given label represents a valid DNS label
++ * Return pointer to the first character after the label upon success,
++ * NULL otherwise.
++ * See RFC1035, 2.3.1
++ */
++/* We don't need to be particularly anal. For example, allowing _, hyphen
++ * at the end, or leading and trailing dots would be ok, since it
++ * can't be used for attacks. (Leading hyphen can be, if someone uses
++ * cmd "$hostname"
++ * in the script: then hostname may be treated as an option)
++ */
++static const char *valid_domain_label(const char *label)
++{
++ unsigned char ch;
++ unsigned pos = 0;
++
++ for (;;) {
++ ch = *label;
++ if ((ch|0x20) < 'a' || (ch|0x20) > 'z') {
++ if (pos == 0) {
++ /* label must begin with letter */
++ return NULL;
++ }
++ if (ch < '0' || ch > '9') {
++ if (ch == '\0' || ch == '.')
++ return label;
++ /* DNS allows only '-', but we are more permissive */
++ if (ch != '-' && ch != '_')
++ return NULL;
++ }
++ }
++ label++;
++ pos++;
++ //Do we want this?
++ //if (pos > 63) /* NS_MAXLABEL; labels must be 63 chars or less */
++ // return NULL;
++ }
++}
++
++/* Check if a given name represents a valid DNS name */
++/* See RFC1035, 2.3.1 */
++static int good_hostname(const char *name)
++{
++ //const char *start = name;
++
++ for (;;) {
++ name = valid_domain_label(name);
++ if (!name)
++ return 0;
++ if (!name[0])
++ return 1;
++ //Do we want this?
++ //return ((name - start) < 1025); /* NS_MAXDNAME */
++ name++;
++ }
++}
++
+ /* Create "opt_name=opt_value" string */
+ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_optflag *optflag, const char *opt_name)
+ {
+@@ -185,8 +243,11 @@ static NOINLINE char *xmalloc_optname_op
+ break;
+ }
+ case OPTION_STRING:
++ case OPTION_STRING_HOST:
+ memcpy(dest, option, len);
+ dest[len] = '\0';
++ if (type == OPTION_STRING_HOST && !good_hostname(dest))
++ safe_strncpy(dest, "bad", len);
+ return ret; /* Short circuit this case */
+ case OPTION_STATIC_ROUTES: {
+ /* Option binary format:
+@@ -314,6 +375,7 @@ static char **fill_envp(struct dhcp_pack
+ /* +1 element for each option, +2 for subnet option: */
+ if (packet) {
+ /* note: do not search for "pad" (0) and "end" (255) options */
++//TODO: change logic to scan packet _once_
+ for (i = 1; i < 255; i++) {
+ temp = udhcp_get_option(packet, i);
+ if (temp) {
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-30 22:09:19 +0000