Apache HTTP Server 403 Error Page UTF-7 Encoded XSS

Medium Nessus Plugin ID 17696


The web server running on the remote host has a cross-site scripting vulnerability.


According to its banner, the version of Apache HTTP Server running on the remote host can be used in cross-site scripting (XSS) attacks. Making a specially crafted request can inject UTF-7 encoded script code into a 403 response page, resulting in XSS attacks.

This is actually a web browser vulnerability that occurs due to non-compliance with RFC 2616 (refer to BID 29112). Apache HTTP Server is not vulnerable, but its default configuration can trigger the non-compliant, exploitable behavior in vulnerable browsers.


Upgrade to Apache HTTP Server 2.2.8 / 2.0.63 / 1.3.41 or later. These versions use a default configuration setting that prevents exploitation in vulnerable web browsers.

See Also



Plugin Details

Severity: Medium

ID: 17696

File Name: apache_utf7_xss.nasl

Version: $Revision: 1.6 $

Type: remote

Family: Web Servers

Published: 2011/11/18

Modified: 2018/01/22

Dependencies: 48204

Risk Information

Risk Factor: Medium


Base Score: 4.3

Temporal Score: 3.7

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

Temporal Vector: CVSS2#E:ND/RL:OF/RC:ND


Base Score: 6.5

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

Vulnerability Information

CPE: cpe:/a:apache:http_server

Required KB Items: installed_sw/Apache

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2008/01/02

Vulnerability Publication Date: 2008/05/08

Reference Information

CVE: CVE-2008-2168

BID: 29112

OSVDB: 45420

CWE: 79