Greg MacManus, of iSIGHT Partners Labs, found a security problem
in several recent versions of nginx. A stack-based buffer
overflow might occur in a worker process while handling a
specially crafted request, potentially resulting in arbitrary code
execution (CVE-2013-2028).
The problem affects nginx 1.3.9 - 1.4.0.
The problem is fixed in nginx 1.5.0, 1.4.1.
Patch for the problem can be found here:
http://nginx.org/download/patch.2013.chunked.txt
As a temporary workaround the following configuration
can be used in each server{} block:
if ($http_transfer_encoding ~* chunked) {
return 444;
}
FIX:
--- src/http/ngx_http_parse.c
+++ src/http/ngx_http_parse.c
@@ -2209,6 +2209,10 @@ data:
}
+ if (ctx->size < 0 || ctx->length < 0) {
+ goto invalid;
+ }
+
return rc;
done:
