According to its banner, the version of Squid running on the remote host is 2.x or 3.x prior to 3.1.23 / 3.2.6 / 3.3.0.3. The included โcachemgr.cgiโ tool reportedly lacks input validation, which could be abused by any client able to access that tool to perform a denial of service attack on the service host.
Note this fix is a result of an incomplete fix for CVE-2012-5643.
Further note that Nessus did not actually test for this issue, but instead has relied on the version in the serverโs banner.
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(64501);
script_version("1.9");
script_cvs_date("Date: 2018/09/17 21:46:53");
script_cve_id("CVE-2012-5643", "CVE-2013-0189");
script_bugtraq_id(56957, 57646);
script_name(english:"Squid 2.x / 3.x < 3.1.23 / 3.2.6 / 3.3.0.3 cachemgr.cgi DoS");
script_summary(english:"Checks version of Squid");
script_set_attribute(attribute:"synopsis", value:
"The remote proxy server is affected by a denial of service
vulnerability.");
script_set_attribute(attribute:"description", value:
"According to its banner, the version of Squid running on the remote
host is 2.x or 3.x prior to 3.1.23 / 3.2.6 / 3.3.0.3. The included
'cachemgr.cgi' tool reportedly lacks input validation, which could be
abused by any client able to access that tool to perform a denial of
service attack on the service host.
Note this fix is a result of an incomplete fix for CVE-2012-5643.
Further note that Nessus did not actually test for this issue, but
instead has relied on the version in the server's banner.");
script_set_attribute(attribute:"see_also", value:"http://www.squid-cache.org/Advisories/SQUID-2012_1.txt");
script_set_attribute(attribute:"solution", value:
"Either upgrade to Squid version 3.1.23 / 3.2.6 / 3.3.0.3 or later, or
apply the vendor-supplied patch.
Alternatively, restrict access to this CGI or limit CGI memory
consumption via the host web server's configuration options.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2013-0189");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2012/12/17");
script_set_attribute(attribute:"patch_publication_date", value:"2013/01/01");
script_set_attribute(attribute:"plugin_publication_date", value:"2013/02/08");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:squid-cache:squid");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Firewalls");
script_copyright(english:"This script is Copyright (C) 2013-2018 Tenable Network Security, Inc.");
script_dependencies("squid_version.nasl");
script_require_keys("www/squid", "Settings/ParanoidReport");
script_require_ports("Services/http_proxy", 3128, 8080);
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
# Build a list of ports from the
list = get_kb_list("http_proxy/*/squid/version");
if (isnull(list)) audit(AUDIT_NOT_INST, "Squid");
# nb: banner checks of open source software are prone to false-
# positives so only run the check if reporting is paranoid.
if (report_paranoia < 2) audit(AUDIT_PARANOID);
vulnerable = FALSE;
not_vuln_list = make_list();
foreach item (keys(list))
{
port = ereg_replace(pattern:'^http_proxy/([0-9]+)/squid/version', replace:'\\1', string:item);
version = list[item];
# Affected:
# Squid 2.x all releases
# Squid 3.0 all releases
# Squid 3.1 < 3.1.23
# Squid 3.2 < 3.2.6
# Squid 3.3.0.x < 3.3.0.3
if (
version =~ "^2\." ||
version =~ "^3\.0\." ||
version =~ "^3\.1\.([0-9]|1[0-9]|2[0-2])([^0-9]|$)" ||
version =~ "^3\.2\.[0-5]([^0-9]|$)" ||
version =~ "^3\.3\.0\.[0-2]([^0-9]|$)"
)
{
vulnerable = TRUE;
if (report_verbosity > 0)
{
source = get_kb_item('http_proxy/'+port+'/squid/source');
report =
'\n Version source : ' + source +
'\n Installed version : ' + version +
'\n Fixed version : 3.1.23 / 3.2.6 / 3.3.0.3' + '\n';
security_warning(port:port, extra:report);
}
else security_warning(port:port);
}
else not_vuln_list = make_list(not_vuln_list, version + " on port " + port);
}
if (vulnerable) exit(0);
else
{
installs = max_index(not_vuln_list);
if (installs == 0) audit(AUDIT_NOT_INST, "Squid");
else if (installs == 1)
audit(AUDIT_INST_VER_NOT_VULN, "Squid", not_vuln_list[0]);
else
exit(0, "The Squid installs ("+ join(not_vuln_list, sep:", ") + ") are not affected.");
}
Vendor | Product | Version |
---|---|---|
squid-cache | squid |