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Implement null byte checks for hostnames and addresses #24770

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Implement null byte checks for hostnames and addresses #24770

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20 changes: 20 additions & 0 deletions main/network.c
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Original file line number Diff line number Diff line change
Expand Up @@ -156,6 +156,21 @@ PHPAPI int php_network_getaddresses(const char *host, int socktype, struct socka
if (host == NULL) {
return 0;
}

/* CVE-2025-1220: reject hostnames containing null bytes */
{
size_t host_len = strlen(host);
if (memchr(host, '\0', host_len) != NULL) {
if (error_string) {
*error_string = ZSTR_INIT_LITERAL("The hostname must not contain null bytes", 0);
php_error_docref(NULL, E_WARNING, "%s", ZSTR_VAL(*error_string));
} else {
php_error_docref(NULL, E_WARNING, "The hostname must not contain null bytes");
}
return 0;
}
}

#ifdef HAVE_GETADDRINFO
memset(&hints, '\0', sizeof(hints));

Expand Down Expand Up @@ -637,6 +652,11 @@ PHPAPI zend_result php_network_parse_network_address_with_port(const char *addr,
memset(in4, 0, sizeof(struct sockaddr_in));
#endif

/* CVE-2025-1220: reject addresses containing null bytes */
if (memchr(addr, '\0', addrlen) != NULL) {
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return FAILURE;
}

if (*addr == '[') {
colon = memchr(addr + 1, ']', addrlen-1);
if (!colon || colon[1] != ':') {
Expand Down
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