Hello! A bug in the experimental SPDY implementation in nginx was found, which might allow an attacker to cause a heap memory buffer overflow in a worker process by using a specially crafted request, potentially resulting in arbitrary code execution (CVE-2014-0133). The problem affects nginx 1.3.15 - 1.5.11, compiled with the ngx_http_spdy_module module (which is not compiled by default) and without --with-debug configure option, if the "spdy" option of the "listen" directive is used in a configuration file. The problem is fixed in nginx 1.5.12, 1.4.7. Patch for the problem can be found here: http://nginx.org/download/patch.2014.spdy2.txt --- src/http/ngx_http_spdy.c +++ src/http/ngx_http_spdy.c @@ -1849,7 +1849,7 @@ static u_char * ngx_http_spdy_state_save(ngx_http_spdy_connection_t *sc, u_char *pos, u_char *end, ngx_http_spdy_handler_pt handler) { -#if (NGX_DEBUG) +#if 1 if (end - pos > NGX_SPDY_STATE_BUFFER_SIZE) { ngx_log_error(NGX_LOG_ALERT, sc->connection->log, 0, "spdy state buffer overflow: " Thanks to Lucas Molas, researcher at Programa STIC, Fundacin Dr. Manuel Sadosky, Buenos Aires, Argentina.