RHEL 3 : squid (RHSA-2004:242) - Nessus

Critical Plugin ID: 12504

This page contains detailed information about the RHEL 3 : squid (RHSA-2004:242) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 12504
Name: RHEL 3 : squid (RHSA-2004:242)
Filename: redhat-RHSA-2004-242.nasl
Vulnerability Published: 2004-08-06
This Plugin Published: 2004-07-06
Last Modification Time: 2021-01-14
Plugin Version: 1.29
Plugin Type: local
Plugin Family: Red Hat Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/cpu, Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Vulnerability Information

Severity: Critical
Vulnerability Published: 2004-08-06
Patch Published: 2004-06-09
CVE [?]: CVE-2004-0541
CPE [?]: cpe:/o:redhat:enterprise_linux:3, p-cpe:/a:redhat:enterprise_linux:squid

Synopsis

The remote Red Hat host is missing a security update.

Description

An updated squid package that fixes a security vulnerability in the NTLM authentication helper is now available.

Squid is a full-featured Web proxy cache.

A buffer overflow was found within the NTLM authentication helper routine. If Squid is configured to use the NTLM authentication helper, a remote attacker could potentially execute arbitrary code by sending a lengthy password. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0541 to this issue.

Note: The NTLM authentication helper is not enabled by default in Red Hat Enterprise Linux 3. Red Hat Enterprise Linux 2.1 is not vulnerable to this issue as it shipped with a version of Squid which did not contain the helper.

Users of Squid should update to this errata package which contains a backported patch that is not vulnerable to this issue.

Solution

Update the affected squid package.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (Metasploit Framework, Exploit-DB)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the RHEL 3 : squid (RHSA-2004:242) vulnerability:

Metasploit: exploit/linux/proxy/squid_ntlm_authenticate
[Squid NTLM Authenticate Overflow]
Exploit-DB: exploits/multiple/remote/9951.rb
[EDB-9951: Squid 2.5.x/3.x - NTLM Buffer Overflow (Metasploit)]
Exploit-DB: exploits/linux/remote/16847.rb
[EDB-16847: Squid - NTLM (Authenticated) Overflow (Metasploit)]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS V2 Vector [?]: AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Base Score:	10.0 (High)
Impact Subscore:	10.0
Exploitability Subscore:	10.0
CVSS Temporal Score:	NA (None)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	10.0 (High)

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Plugin Source

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2004:242. The text 
# itself is copyright (C) Red Hat, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(12504);
  script_version("1.29");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/14");

  script_cve_id("CVE-2004-0541");
  script_xref(name:"RHSA", value:"2004:242");

  script_name(english:"RHEL 3 : squid (RHSA-2004:242)");
  script_summary(english:"Checks the rpm output for the updated package");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Red Hat host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"An updated squid package that fixes a security vulnerability in the
NTLM authentication helper is now available.

Squid is a full-featured Web proxy cache.

A buffer overflow was found within the NTLM authentication helper
routine. If Squid is configured to use the NTLM authentication helper,
a remote attacker could potentially execute arbitrary code by sending
a lengthy password. The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CVE-2004-0541 to this issue.

Note: The NTLM authentication helper is not enabled by default in Red
Hat Enterprise Linux 3. Red Hat Enterprise Linux 2.1 is not vulnerable
to this issue as it shipped with a version of Squid which did not
contain the helper.

Users of Squid should update to this errata package which contains a
backported patch that is not vulnerable to this issue."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2004-0541"
  );
  # http://www.idefense.com/application/poi/display?id=107
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?f742b61a"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2004:242"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected squid package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  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:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:squid");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:3");

  script_set_attribute(attribute:"vuln_publication_date", value:"2004/08/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2004/06/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2004/07/06");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2004-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Red Hat Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^3([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 3.x", "Red Hat " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2004:242";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{
  flag = 0;
  if (rpm_check(release:"RHEL3", reference:"squid-2.5.STABLE3-6.3E")) flag++;

  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "squid");
  }
}

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/redhat-RHSA-2004-242.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\redhat-RHSA-2004-242.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/redhat-RHSA-2004-242.nasl

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How to Run

Here is how to run the RHEL 3 : squid (RHSA-2004:242) as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select Red Hat Local Security Checks plugin family.
On the right side table select RHEL 3 : squid (RHSA-2004:242) plugin ID 12504.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl redhat-RHSA-2004-242.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a redhat-RHSA-2004-242.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - redhat-RHSA-2004-242.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state redhat-RHSA-2004-242.nasl -t <IP/HOST>

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References

RHSA | Red Hat Security Advisory:

2004:242

See also:

Similar and related Nessus plugins:

36518 - FreeBSD : Buffer overflow in Squid NTLM authentication helper (6f955451-ba54-11d8-b88c-000d610a3b12)
14524 - GLSA-200406-13 : Squid: NTLM authentication helper buffer overflow
14158 - Mandrake Linux Security Advisory : squid (MDKSA-2004:059)
12294 - Squid ntlm_check_auth Function NTLM Authentication Helper Password Handling Remote Overflow
13832 - SuSE-SA:2004:016: squid

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file redhat-RHSA-2004-242.nasl version 1.29. For more plugins, visit the Nessus Plugin Library.

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RHEL 3 : squid (RHSA-2004:242) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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