CentOS 6 : libuser (CESA-2015:1482) - Nessus

High Plugin ID: 85029

This page contains detailed information about the CentOS 6 : libuser (CESA-2015:1482) 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: 85029
Name: CentOS 6 : libuser (CESA-2015:1482)
Filename: centos_RHSA-2015-1482.nasl
Vulnerability Published: N/A
This Plugin Published: 2015-07-28
Last Modification Time: 2021-01-04
Plugin Version: 2.6
Plugin Type: local
Plugin Family: CentOS Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/CentOS/release, Host/CentOS/rpm-list, Host/local_checks_enabled

Vulnerability Information

Severity: High
Vulnerability Published: N/A
Patch Published: 2015-07-26
CVE [?]: CVE-2015-3245, CVE-2015-3246
CPE [?]: cpe:/o:centos:centos:6, p-cpe:/a:centos:centos:libuser, p-cpe:/a:centos:centos:libuser-devel, p-cpe:/a:centos:centos:libuser-python
Exploited by Malware: True

Synopsis

The remote CentOS host is missing one or more security updates.

Description

Updated libuser packages that fix two security issues are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The libuser library implements a standardized interface for manipulating and administering user and group accounts. Sample applications that are modeled after applications from the shadow password suite (shadow-utils) are included in these packages.

Two flaws were found in the way the libuser library handled the /etc/passwd file. A local attacker could use an application compiled against libuser (for example, userhelper) to manipulate the /etc/passwd file, which could result in a denial of service or possibly allow the attacker to escalate their privileges to root. (CVE-2015-3245, CVE-2015-3246)

Red Hat would like to thank Qualys for reporting these issues.

All libuser users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue.

Solution

Update the affected libuser packages.

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 CentOS 6 : libuser (CESA-2015:1482) 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 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)

STIG Severity [?]: I
STIG Risk Rating: 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-2015:1482 and 
# CentOS Errata and Security Advisory 2015:1482 respectively.
#

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

if (description)
{
  script_id(85029);
  script_version("2.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2015-3245", "CVE-2015-3246");
  script_bugtraq_id(76021, 76022);
  script_xref(name:"RHSA", value:"2015:1482");
  script_xref(name:"IAVA", value:"2015-A-0179");

  script_name(english:"CentOS 6 : libuser (CESA-2015:1482)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Updated libuser packages that fix two security issues are now
available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Important
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

The libuser library implements a standardized interface for
manipulating and administering user and group accounts. Sample
applications that are modeled after applications from the shadow
password suite (shadow-utils) are included in these packages.

Two flaws were found in the way the libuser library handled the
/etc/passwd file. A local attacker could use an application compiled
against libuser (for example, userhelper) to manipulate the
/etc/passwd file, which could result in a denial of service or
possibly allow the attacker to escalate their privileges to root.
(CVE-2015-3245, CVE-2015-3246)

Red Hat would like to thank Qualys for reporting these issues.

All libuser users are advised to upgrade to these updated packages,
which contain a backported patch to correct this issue."
  );
  # http://lists.centos.org/pipermail/centos-cr-announce/2015-July/002103.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?dfdc11bc"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected libuser packages."
  );
  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:"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:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libuser");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libuser-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libuser-python");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");

  script_set_attribute(attribute:"patch_publication_date", value:"2015/07/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/07/28");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

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

  exit(0);
}


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

# Temp disable
exit(0, 'Temporarily disabled.');

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/CentOS/release")) audit(AUDIT_OS_NOT, "CentOS");
if (!get_kb_item("Host/CentOS/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, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-6", reference:"libuser-0.56.13-8.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"libuser-devel-0.56.13-8.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"libuser-python-0.56.13-8.el6_7")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/centos_RHSA-2015-1482.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\centos_RHSA-2015-1482.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/centos_RHSA-2015-1482.nasl

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How to Run

Here is how to run the CentOS 6 : libuser (CESA-2015:1482) 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 CentOS Local Security Checks plugin family.
On the right side table select CentOS 6 : libuser (CESA-2015:1482) plugin ID 85029.
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 centos_RHSA-2015-1482.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a centos_RHSA-2015-1482.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - centos_RHSA-2015-1482.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 centos_RHSA-2015-1482.nasl -t <IP/HOST>

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References

BID | SecurityFocus Bugtraq ID:

76021, 76022

RHSA | Red Hat Security Advisory:

2015:1482

IAVA | Information Assurance Vulnerability Alert:

2015-A-0179

See also:

Similar and related Nessus plugins:

84964 - Amazon Linux AMI : usermode / libuser (ALAS-2015-572)
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)
147366 - NewStart CGSL CORE 5.04 / MAIN 5.04 : libuser Multiple Vulnerabilities (NS-SA-2021-0044)
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 centos_RHSA-2015-1482.nasl version 2.6. For more plugins, visit the Nessus Plugin Library.

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CentOS 6 : libuser (CESA-2015:1482) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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