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Detect more unsafe URIs in ngx_http_parse_unsafe_uri().

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The following URIs were considered safe: "..", "../foo", and "/foo/..".
This commit is contained in:
Ruslan Ermilov 2013-12-23 18:11:56 +04:00
parent 3f36c684a1
commit 336bcb22d1
1 changed files with 7 additions and 3 deletions
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10
src/http/ngx_http_parse.c
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@ -1790,7 +1790,9 @@ ngx_http_parse_unsafe_uri(ngx_http_request_t *r, ngx_str_t *uri,
goto unsafe;
}
if (p[0] == '.' && len == 3 && p[1] == '.' && (ngx_path_separator(p[2]))) {
if (p[0] == '.' && len > 1 && p[1] == '.'
&& (len == 2 || ngx_path_separator(p[2])))
{
goto unsafe;
}
@ -1816,9 +1818,11 @@ ngx_http_parse_unsafe_uri(ngx_http_request_t *r, ngx_str_t *uri,
if (ngx_path_separator(ch) && len > 2) {
/* detect "/../" */
/* detect "/../" and "/.." */
if (p[0] == '.' && p[1] == '.' && ngx_path_separator(p[2])) {
if (p[0] == '.' && p[1] == '.'
&& (len == 3 || ngx_path_separator(p[2])))
{
goto unsafe;
}
}