nginx on Windows Directory Aliases Access Restriction Bypass

Medium Nessus Plugin ID 61394


The web server on the remote host may be affected by an access restriction bypass vulnerability.


According to its Server response header, the installed version of nginx is 0.x greater than or equal to 0.7.52 or 1.x earlier than 1.2.1 / 1.3.1 and is, therefore, affected by an access restriction bypass vulnerability.

By using a request with a specially crafted directory name, such as '/directory::$index_allocation' in place of '/directory', an attacker may be able to bypass access restrictions such as :

location /directory/ { deny all;

Note that this vulnerability only affects installs on Windows and that Nessus has not tried to verify the underlying OS.


Upgrade to version 1.2.1 / 1.3.1 or later.

See Also

Plugin Details

Severity: Medium

ID: 61394

File Name: nginx_1_3_1.nasl

Version: $Revision: 1.6 $

Type: remote

Family: Web Servers

Published: 2012/08/02

Modified: 2018/01/26

Dependencies: 106375

Risk Information

Risk Factor: Medium


Base Score: 5

Temporal Score: 4.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Temporal Vector: CVSS2#E:F/RL:OF/RC:C


Base Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Vulnerability Information

CPE: cpe:/a:igor_sysoev:nginx

Required KB Items: Settings/ParanoidReport, installed_sw/nginx

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2012/06/05

Vulnerability Publication Date: 2012/06/05

Reference Information

CVE: CVE-2011-4963

BID: 55920

OSVDB: 84339