According to its banner, the version of IBM HTTP Server running on the remote host is affected by a security feature bypass vulnerability, known as Bar Mitzvah, due to improper combination of state data with key data by the RC4 cipher algorithm during the initialization phase.
A man-in-the-middle attacker can exploit this, via a brute-force attack using LSB values, to decrypt the traffic.
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(87538);
script_version("1.6");
script_cvs_date("Date: 2019/11/20");
script_cve_id("CVE-2015-2808");
script_bugtraq_id(73684);
script_name(english:"IBM HTTP Server SSL/TLS RC4 Stream Cipher Key Invariance (Bar Mitzvah)");
script_summary(english:"Checks the version in server response header.");
script_set_attribute(attribute:"synopsis", value:
"The remote web server is affected by a security feature bypass
vulnerability.");
script_set_attribute(attribute:"description", value:
"According to its banner, the version of IBM HTTP Server running on the
remote host is affected by a security feature bypass vulnerability,
known as Bar Mitzvah, due to improper combination of state data with
key data by the RC4 cipher algorithm during the initialization phase.
A man-in-the-middle attacker can exploit this, via a brute-force
attack using LSB values, to decrypt the traffic.
Note that Nessus has not tested for this issue but has instead relied
only on the application's self-reported version number.");
script_set_attribute(attribute:"see_also", value:"http://www-01.ibm.com/support/docview.wss?uid=swg21701072");
script_set_attribute(attribute:"see_also", value:"http://www-01.ibm.com/support/docview.wss?uid=swg24039770");
# https://www.blackhat.com/docs/asia-15/materials/asia-15-Mantin-Bar-Mitzvah-Attack-Breaking-SSL-With-13-Year-Old-RC4-Weakness-wp.pdf
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4bbf45ac");
script_set_attribute(attribute:"solution", value:
"Upgrade to IBM HTTP Server 7.0.0.39 / 8.0.0.11 / or 8.5.5.6 or later.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2015-2808");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"in_the_news", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2015/01/19");
script_set_attribute(attribute:"patch_publication_date", value:"2015/04/09");
script_set_attribute(attribute:"plugin_publication_date", value:"2015/12/21");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:ibm:http_server");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Web Servers");
script_copyright(english:"This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("http_version.nasl");
script_require_keys("www/ibm-http", "Settings/ParanoidReport");
script_require_ports("Services/www", 80);
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");
get_kb_item_or_exit("www/ibm-http");
port = get_http_port(default:80);
# Get Server header
server_header = http_server_header(port:port);
if (empty_or_null(server_header)) audit(AUDIT_WEB_NO_SERVER_HEADER, port);
# Make sure this is IBM HTTP
if (
"IBM HTTP Server" >!< server_header &&
"IBM_HTTP_Server" >!< server_header
) audit(AUDIT_WRONG_WEB_SERVER, port, "IBM HTTP Server");
if (report_paranoia < 2) audit(AUDIT_PARANOID);
# Get Server header and version
pattern = "IBM[ _]HTTP[ _]Server\/(V([0-9]+)R([0-9]+)M([0-9]+))";
matches = eregmatch(pattern:pattern, string:server_header);
if (!isnull(matches))
{
version = matches[2] + "." + matches[3] + "." + matches[4];
}
else
{
pattern = "IBM[ _]HTTP[ _]Server\/([0-9]+[0-9.]+)";
matches = eregmatch(pattern:pattern, string:server_header);
version = matches[1];
}
if (isnull(matches)) audit(AUDIT_UNKNOWN_WEB_SERVER_VER, "IBM HTTP Server", port);
# Check granularity
# format V#R#M# versions are going to be
# not granular enough by default in this case.
if (
# All of 6.0 and 6.1 can be configured in a vulnerable state
version =~ "^7(\.0)?$" ||
version =~ "^7\.0\.0$" ||
version =~ "^8(\.0)?$" ||
version =~ "^8\.0\.0$" ||
version =~ "^8\.5(\.5)?$"
) audit(AUDIT_VER_NOT_GRANULAR, "IBM HTTP Server", port, version);
source = matches[0];
fix = FALSE;
if (version =~ "^6\.[0-1]\.")
{
# 6.0 and 6.1 do not have patches, but they do have RC4 enabled by default.
# RC4 can be removed by enabling FIPS140-2, or by following a walk through.
fix = "See vendor";
}
else if (version =~ "^7\.0\.0\.([0-9]|[1-2][0-9]|3[0-7])($|[^0-9])")
{
# V7.0.0.0 through 7.0.0.37
fix = "7.0.0.39";
}
else if (version =~ "^8\.0\.0\.([0-9]|10)($|[^0-9])")
{
# V8.0 through 8.0.0.10
fix = "8.0.0.11";
}
else if (version =~ "^8\.5\.[0-4]($|[^0-9])" ||
version =~ "^8\.5\.5\.[0-5]($|[^0-9])")
{
# V8.5.0.0 through 8.5.4.x
# V8.5.5.0 through 8.5.5.5
fix = "8.5.5.6";
}
if (fix)
{
if (report_verbosity > 0)
{
report =
'\n Version source : ' + source +
'\n Installed version : ' + version +
'\n Fixed version : ' + fix +
'\n';
security_warning(port:port, extra:report);
}
else security_warning(port);
exit(0);
}
else audit(AUDIT_LISTEN_NOT_VULN, "IBM HTTP Server", port, version);
Vendor | Product | Version | CPE |
---|---|---|---|
ibm | http_server | cpe:/a:ibm:http_server |