NewStart CGSL CORE 5.04 / MAIN 5.04 : libuser Multiple Vulnerabilities (NS-SA-2021-0044) - Nessus

High Plugin ID: 147366

This page contains detailed information about the NewStart CGSL CORE 5.04 / MAIN 5.04 : libuser Multiple Vulnerabilities (NS-SA-2021-0044) 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: 147366
Name: NewStart CGSL CORE 5.04 / MAIN 5.04 : libuser Multiple Vulnerabilities (NS-SA-2021-0044)
Filename: newstart_cgsl_NS-SA-2021-0044_libuser.nasl
Vulnerability Published: 2015-07-23
This Plugin Published: 2021-03-10
Last Modification Time: 2021-03-11
Plugin Version: 1.3
Plugin Type: local
Plugin Family: NewStart CGSL Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/cpu, Host/local_checks_enabled, Host/ZTE-CGSL/release, Host/ZTE-CGSL/rpm-list

Vulnerability Information

Severity: High
Vulnerability Published: 2015-07-23
Patch Published: 2021-03-09
CVE [?]: CVE-2015-3245, CVE-2015-3246
CPE [?]: N/A
Exploited by Malware: True

Synopsis

The remote machine is affected by multiple vulnerabilities.

Description

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has libuser packages installed that are affected by multiple vulnerabilities:

- libuser before 0.56.13-8 and 0.60 before 0.60-7, as used in the userhelper program in the usermode package, directly modifies /etc/passwd, which allows local users to cause a denial of service (inconsistent file state) by causing an error during the modification. NOTE: this issue can be combined with CVE-2015-3245 to gain privileges. (CVE-2015-3246)

- Incomplete blacklist vulnerability in the chfn function in libuser before 0.56.13-8 and 0.60 before 0.60-7, as used in the userhelper program in the usermode package, allows local users to cause a denial of service (/etc/passwd corruption) via a newline character in the GECOS field. (CVE-2015-3245)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the vulnerable CGSL libuser packages. Note that updated packages may not be available yet. Please contact ZTE for more information.

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the NewStart CGSL CORE 5.04 / MAIN 5.04 : libuser Multiple Vulnerabilities (NS-SA-2021-0044) vulnerability:

Metasploit: exploit/linux/local/libuser_roothelper_priv_esc
[Libuser roothelper Privilege Escalation]
Exploit-DB: exploits/linux/dos/37706.txt
[EDB-37706: Libuser Library - Multiple Vulnerabilities]
Exploit-DB: exploits/linux/local/44633.rb
[EDB-44633: Libuser - 'roothelper' Local Privilege Escalation (Metasploit)]
GitHub: https://github.com/ARGOeu/secmon-probes
[CVE-2015-3245]

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 Score Source [?]: CVE-2015-3246
CVSS V2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C/E:H/RL:OF/RC:C

CVSS Base Score:	7.2 (High)
Impact Subscore:	10.0
Exploitability Subscore:	3.9
CVSS Temporal Score:	6.3 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.3 (Medium)

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Plugin Source

##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2021-0044. The text
# itself is copyright (C) ZTE, Inc.
##

include('compat.inc');

if (description)
{
  script_id(147366);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/03/11");

  script_cve_id("CVE-2015-3245", "CVE-2015-3246");
  script_bugtraq_id(76021, 76022);

  script_name(english:"NewStart CGSL CORE 5.04 / MAIN 5.04 : libuser Multiple Vulnerabilities (NS-SA-2021-0044)");

  script_set_attribute(attribute:"synopsis", value:
"The remote machine is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has libuser packages installed that are affected
by multiple vulnerabilities:

  - libuser before 0.56.13-8 and 0.60 before 0.60-7, as used in the userhelper program in the usermode
    package, directly modifies /etc/passwd, which allows local users to cause a denial of service
    (inconsistent file state) by causing an error during the modification. NOTE: this issue can be combined
    with CVE-2015-3245 to gain privileges. (CVE-2015-3246)

  - Incomplete blacklist vulnerability in the chfn function in libuser before 0.56.13-8 and 0.60 before
    0.60-7, as used in the userhelper program in the usermode package, allows local users to cause a denial of
    service (/etc/passwd corruption) via a newline character in the GECOS field. (CVE-2015-3245)

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://security.gd-linux.com/notice/NS-SA-2021-0044");
  script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL libuser packages. Note that updated packages may not be available yet. Please contact ZTE
for more information.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2015-3246");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Libuser roothelper Privilege Escalation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/07/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/03/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/03/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"NewStart CGSL Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

include('audit.inc');
include('global_settings.inc');
include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

release = get_kb_item('Host/ZTE-CGSL/release');
if (isnull(release) || release !~ "^CGSL (MAIN|CORE)") audit(AUDIT_OS_NOT, 'NewStart Carrier Grade Server Linux');

if (release !~ "CGSL CORE 5.04" &&
    release !~ "CGSL MAIN 5.04")
  audit(AUDIT_OS_NOT, 'NewStart CGSL CORE 5.04 / NewStart CGSL MAIN 5.04');

if (!get_kb_item('Host/ZTE-CGSL/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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'NewStart Carrier Grade Server Linux', cpu);

flag = 0;

pkgs = {
  'CGSL CORE 5.04': [
    'libuser-0.60-9.el7',
    'libuser-devel-0.60-9.el7',
    'libuser-python-0.60-9.el7'
  ],
  'CGSL MAIN 5.04': [
    'libuser-0.60-9.el7',
    'libuser-devel-0.60-9.el7',
    'libuser-python-0.60-9.el7'
  ]
};
pkg_list = pkgs[release];

foreach (pkg in pkg_list)
  if (rpm_check(release:'ZTE ' + release, reference:pkg)) flag++;

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

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/newstart_cgsl_NS-SA-2021-0044_libuser.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\newstart_cgsl_NS-SA-2021-0044_libuser.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/newstart_cgsl_NS-SA-2021-0044_libuser.nasl

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How to Run

Here is how to run the NewStart CGSL CORE 5.04 / MAIN 5.04 : libuser Multiple Vulnerabilities (NS-SA-2021-0044) 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 NewStart CGSL Local Security Checks plugin family.
On the right side table select NewStart CGSL CORE 5.04 / MAIN 5.04 : libuser Multiple Vulnerabilities (NS-SA-2021-0044) plugin ID 147366.
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 newstart_cgsl_NS-SA-2021-0044_libuser.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a newstart_cgsl_NS-SA-2021-0044_libuser.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - newstart_cgsl_NS-SA-2021-0044_libuser.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 newstart_cgsl_NS-SA-2021-0044_libuser.nasl -t <IP/HOST>

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References

BID | SecurityFocus Bugtraq ID:

76021, 76022

See also:

Similar and related Nessus plugins:

84964 - Amazon Linux AMI : usermode / libuser (ALAS-2015-572)
85029 - CentOS 6 : libuser (CESA-2015:1482)
84988 - CentOS 7 : libuser (CESA-2015:1483)
91108 - Debian DLA-468-1 : libuser security update
91327 - F5 Networks BIG-IP : Linux libuser vulnerability (SOL05770600)
85167 - Fedora 21 : libuser-0.62-1.fc21 (2015-12064)
85134 - Fedora 22 : libuser-0.62-1.fc22 (2015-12301)
85186 - openSUSE Security Update : libuser (openSUSE-2015-529)
85115 - Oracle Linux 6 : libuser (ELSA-2015-1482)
84975 - Oracle Linux 7 : libuser (ELSA-2015-1483)
85147 - OracleVM 3.3 : libuser (OVMSA-2015-0106)
84976 - RHEL 6 : libuser (RHSA-2015:1482)
84977 - RHEL 7 : libuser (RHSA-2015:1483)
85210 - Scientific Linux Security Update : libuser on SL6.x i386/x86_64 (20150723)
85004 - Scientific Linux Security Update : libuser on SL7.x x86_64 (20150723)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file newstart_cgsl_NS-SA-2021-0044_libuser.nasl version 1.3. For more plugins, visit the Nessus Plugin Library.

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NewStart CGSL CORE 5.04 / MAIN 5.04 : libuser Multiple Vulnerabilities (NS-SA-2021-0044) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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