From 7b781638e87ccc39745feab89802076ba3fc1d65 Mon Sep 17 00:00:00 2001 From: Maxim Dounin Date: Thu, 15 Mar 2012 11:41:43 +0000 Subject: [PATCH] Merge of r4530, r4531: null character fixes. *) Fixed incorrect ngx_cpystrn() usage in ngx_http_*_process_header(). This resulted in a disclosure of previously freed memory if upstream server returned specially crafted response, potentially exposing sensitive information. Reported by Matthew Daley. *) Headers with null character are now rejected. Headers with NUL character aren't allowed by HTTP standard and may cause various security problems. They are now unconditionally rejected. --- src/http/modules/ngx_http_fastcgi_module.c | 8 ++++---- src/http/modules/ngx_http_proxy_module.c | 6 ++++-- src/http/modules/ngx_http_scgi_module.c | 6 ++++-- src/http/modules/ngx_http_uwsgi_module.c | 6 ++++-- src/http/ngx_http_parse.c | 14 ++++++++++++++ 5 files changed, 30 insertions(+), 10 deletions(-) diff --git a/src/http/modules/ngx_http_fastcgi_module.c b/src/http/modules/ngx_http_fastcgi_module.c index 5ae42ef62..23ef2957f 100644 --- a/src/http/modules/ngx_http_fastcgi_module.c +++ b/src/http/modules/ngx_http_fastcgi_module.c @@ -1446,10 +1446,10 @@ ngx_http_fastcgi_process_header(ngx_http_request_t *r) h->lowcase_key = h->key.data + h->key.len + 1 + h->value.len + 1; - ngx_cpystrn(h->key.data, r->header_name_start, - h->key.len + 1); - ngx_cpystrn(h->value.data, r->header_start, - h->value.len + 1); + ngx_memcpy(h->key.data, r->header_name_start, h->key.len); + h->key.data[h->key.len] = '\0'; + ngx_memcpy(h->value.data, r->header_start, h->value.len); + h->value.data[h->value.len] = '\0'; } h->hash = r->header_hash; diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c index 6bb30db4d..75249b749 100644 --- a/src/http/modules/ngx_http_proxy_module.c +++ b/src/http/modules/ngx_http_proxy_module.c @@ -1278,8 +1278,10 @@ ngx_http_proxy_process_header(ngx_http_request_t *r) h->value.data = h->key.data + h->key.len + 1; h->lowcase_key = h->key.data + h->key.len + 1 + h->value.len + 1; - ngx_cpystrn(h->key.data, r->header_name_start, h->key.len + 1); - ngx_cpystrn(h->value.data, r->header_start, h->value.len + 1); + ngx_memcpy(h->key.data, r->header_name_start, h->key.len); + h->key.data[h->key.len] = '\0'; + ngx_memcpy(h->value.data, r->header_start, h->value.len); + h->value.data[h->value.len] = '\0'; if (h->key.len == r->lowcase_index) { ngx_memcpy(h->lowcase_key, r->lowcase_header, h->key.len); diff --git a/src/http/modules/ngx_http_scgi_module.c b/src/http/modules/ngx_http_scgi_module.c index 08483cd70..5fb2ac5ae 100644 --- a/src/http/modules/ngx_http_scgi_module.c +++ b/src/http/modules/ngx_http_scgi_module.c @@ -894,8 +894,10 @@ ngx_http_scgi_process_header(ngx_http_request_t *r) h->value.data = h->key.data + h->key.len + 1; h->lowcase_key = h->key.data + h->key.len + 1 + h->value.len + 1; - ngx_cpystrn(h->key.data, r->header_name_start, h->key.len + 1); - ngx_cpystrn(h->value.data, r->header_start, h->value.len + 1); + ngx_memcpy(h->key.data, r->header_name_start, h->key.len); + h->key.data[h->key.len] = '\0'; + ngx_memcpy(h->value.data, r->header_start, h->value.len); + h->value.data[h->value.len] = '\0'; if (h->key.len == r->lowcase_index) { ngx_memcpy(h->lowcase_key, r->lowcase_header, h->key.len); diff --git a/src/http/modules/ngx_http_uwsgi_module.c b/src/http/modules/ngx_http_uwsgi_module.c index 367388e63..fb5ff0d78 100644 --- a/src/http/modules/ngx_http_uwsgi_module.c +++ b/src/http/modules/ngx_http_uwsgi_module.c @@ -947,8 +947,10 @@ ngx_http_uwsgi_process_header(ngx_http_request_t *r) h->value.data = h->key.data + h->key.len + 1; h->lowcase_key = h->key.data + h->key.len + 1 + h->value.len + 1; - ngx_cpystrn(h->key.data, r->header_name_start, h->key.len + 1); - ngx_cpystrn(h->value.data, r->header_start, h->value.len + 1); + ngx_memcpy(h->key.data, r->header_name_start, h->key.len); + h->key.data[h->key.len] = '\0'; + ngx_memcpy(h->value.data, r->header_start, h->value.len); + h->value.data[h->value.len] = '\0'; if (h->key.len == r->lowcase_index) { ngx_memcpy(h->lowcase_key, r->lowcase_header, h->key.len); diff --git a/src/http/ngx_http_parse.c b/src/http/ngx_http_parse.c index 61081a414..420c9275f 100644 --- a/src/http/ngx_http_parse.c +++ b/src/http/ngx_http_parse.c @@ -814,6 +814,10 @@ ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b, break; } + if (ch == '\0') { + return NGX_HTTP_PARSE_INVALID_HEADER; + } + r->invalid_header = 1; break; @@ -876,6 +880,10 @@ ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b, break; } + if (ch == '\0') { + return NGX_HTTP_PARSE_INVALID_HEADER; + } + r->invalid_header = 1; break; @@ -894,6 +902,8 @@ ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b, r->header_start = p; r->header_end = p; goto done; + case '\0': + return NGX_HTTP_PARSE_INVALID_HEADER; default: r->header_start = p; state = sw_value; @@ -915,6 +925,8 @@ ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b, case LF: r->header_end = p; goto done; + case '\0': + return NGX_HTTP_PARSE_INVALID_HEADER; } break; @@ -928,6 +940,8 @@ ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b, break; case LF: goto done; + case '\0': + return NGX_HTTP_PARSE_INVALID_HEADER; default: state = sw_value; break;