CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
EPSS
Percentile
99.6%
The remote server is affected by a remote code execution vulnerability in the Squid Internet Object Cache server due to a failure to test the length of the user-supplied LanMan hash value in the ntlm_check_auth() function in libntlmssp.c. An unauthenticated, remote attacker can exploit this, via a specially crafted request, to cause a stack-based buffer overflow, resulting in the execution of arbitrary code.
Note that Squid 2.5*-STABLE and 3.*-PRE are reportedly vulnerable.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(12294);
script_version("1.29");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");
script_cve_id("CVE-2004-0541");
script_bugtraq_id(10500);
script_name(english:"Squid ntlm_check_auth Function NTLM Authentication Helper Password Handling Remote Overflow");
script_set_attribute(attribute:"synopsis", value:
"The remote service is affected by a remote code execution
vulnerability.");
script_set_attribute(attribute:"description", value:
"The remote server is affected by a remote code execution vulnerability
in the Squid Internet Object Cache server due to a failure to test the
length of the user-supplied LanMan hash value in the ntlm_check_auth()
function in libntlmssp.c. An unauthenticated, remote attacker can
exploit this, via a specially crafted request, to cause a stack-based
buffer overflow, resulting in the execution of arbitrary code.
Note that Squid 2.5*-STABLE and 3.*-PRE are reportedly vulnerable.");
# https://labs.idefense.com/verisign/intelligence/2009/vulnerabilities/display.php?id=107
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7990c203");
script_set_attribute(attribute:"solution", value:
"Apply the relevant patch or upgrade to the latest version.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2004-0541");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"metasploit_name", value:'Squid NTLM Authenticate Overflow');
script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2004/06/09");
script_set_attribute(attribute:"patch_publication_date", value:"2004/06/07");
script_set_attribute(attribute:"plugin_publication_date", value:"2004/06/30");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:squid-cache:squid");
script_set_attribute(attribute:"thorough_tests", value:"true");
script_end_attributes();
script_category(ACT_MIXED_ATTACK);
script_family(english:"Firewalls");
script_copyright(english:"This script is Copyright (C) 2004-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("find_service1.nasl", "proxy_use.nasl");
script_require_ports("Services/http_proxy", 8080, 3128);
exit(0);
}
# start script
# Keep the old API for that test
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("http_func.inc");
port = get_service(svc:"http_proxy", default:3128, exit_on_fail:TRUE);
soc = open_sock_tcp(port);
if (!soc) audit(AUDIT_SOCK_FAIL, port);
# up to 25 chars won't overwrite any mem in SQUID NTLM helper auth
malhost = string("http://www.", rand() % 65536, "nessus.test/");
malreq = string("GET ", malhost, " HTTP/1.1\r\nHost: ", malhost, "\r\n");
malreq += string("Authorization: NTLM ", crap(20), "=\r\n\r\n");
send(socket:soc, data:malreq);
r = http_recv(socket:soc);
close(soc);
if (!r) audit(AUDIT_RESP_NOT, port);
if (safe_checks())
{
if (!egrep(string:r, pattern:"^Server: [Ss]quid")) audit(AUDIT_NOT_DETECT, "Squid", port);
if (egrep(string:r, pattern:"^Server: [Ss]quid/(2\.5\.STABLE[0-5]([^0-9]|$)|3\.0\.PRE|2\.[0-4]\.)") )
{
mymsg = string("According to its version number, the remote SQUID Proxy\n");
mymsg += string("may be affected by a remote buffer overflow in its NTLM\n");
mymsg += string("authentication component, if enabled. Run Nessus without safe\n");
mymsg += string("checks to actually test the overflow.\n");
security_hole(port:port, extra:mymsg);
exit(0);
}
else audit(AUDIT_LISTEN_NOT_VULN, "Squid", port);
}
else
{
if (report_paranoia < 2)
{
if (!egrep(string:r, pattern:"^Server: [Ss]quid")) audit(AUDIT_NOT_DETECT, "Squid", port);
}
soc = open_sock_tcp(port);
if (!soc) audit(AUDIT_SOCK_FAIL, port);
malhost = string("http://www.", rand() % 65536, "nessus.test/");
malreq = string("GET ", malhost, " HTTP/1.1\r\nHost: ", malhost, "\r\n");
malreq += string("Authorization: NTLM TlRMTVNTUAABAAAAl4II4AAA", crap(data:"A", length:1024), "=\r\n\r\n");
send(socket:soc, data:malreq);
r = http_recv(socket:soc);
close(soc);
if (! r)
{
security_hole(port);
exit(0);
}
else audit(AUDIT_LISTEN_NOT_VULN, "Squid", port);
}