Scientific Linux Security Update : libuser on SL7.x x86_64 (20150723) - Nessus

High Plugin ID: 85004

This page contains detailed information about the Scientific Linux Security Update : libuser on SL7.x x86_64 (20150723) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

hide

Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 85004
Name: Scientific Linux Security Update : libuser on SL7.x x86_64 (20150723)
Filename: sl_20150723_libuser_on_SL7_x.nasl
Vulnerability Published: 2015-08-11
This Plugin Published: 2015-07-27
Last Modification Time: 2021-01-14
Plugin Version: 2.13
Plugin Type: local
Plugin Family: Scientific Linux 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: High
Vulnerability Published: 2015-08-11
Patch Published: 2015-07-23
CVE [?]: CVE-2015-3245, CVE-2015-3246
CPE [?]: p-cpe:/a:fermilab:scientific_linux:libuser, p-cpe:/a:fermilab:scientific_linux:libuser-debuginfo, p-cpe:/a:fermilab:scientific_linux:libuser-devel, p-cpe:/a:fermilab:scientific_linux:libuser-python, x-cpe:/o:fermilab:scientific_linux
Exploited by Malware: True

Synopsis

The remote Scientific Linux host is missing one or more security updates.

Description

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)

Solution

Update the affected 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 Scientific Linux Security Update : libuser on SL7.x x86_64 (20150723) 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

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

STIG Severity [?]: I
STIG Risk Rating: High

Go back to menu.

Plugin Source

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text is (C) Scientific Linux.
#

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

if (description)
{
  script_id(85004);
  script_version("2.13");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/14");

  script_cve_id("CVE-2015-3245", "CVE-2015-3246");
  script_xref(name:"IAVA", value:"2015-A-0179");

  script_name(english:"Scientific Linux Security Update : libuser on SL7.x x86_64 (20150723)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Scientific Linux host is missing one or more security
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"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)"
  );
  # https://listserv.fnal.gov/scripts/wa.exe?A2=ind1507&L=scientific-linux-errata&F=&S=&P=10651
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?55d151f7"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/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:"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:fermilab:scientific_linux:libuser");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:libuser-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:libuser-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:libuser-python");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/o:fermilab:scientific_linux");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/08/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/07/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/07/27");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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:"Scientific Linux Local Security Checks");

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

  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) || "Scientific Linux " >!< release) audit(AUDIT_HOST_NOT, "running Scientific Linux");
os_ver = pregmatch(pattern: "Scientific Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Scientific Linux");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Scientific Linux 7.x", "Scientific Linux " + 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 (cpu >!< "x86_64" && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Scientific Linux", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);


flag = 0;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"libuser-0.60-7.el7_1")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"libuser-debuginfo-0.60-7.el7_1")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"libuser-devel-0.60-7.el7_1")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"libuser-python-0.60-7.el7_1")) 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 / libuser-debuginfo / libuser-devel / libuser-python");
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/sl_20150723_libuser_on_SL7_x.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\sl_20150723_libuser_on_SL7_x.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/sl_20150723_libuser_on_SL7_x.nasl

Go back to menu.

How to Run

Here is how to run the Scientific Linux Security Update : libuser on SL7.x x86_64 (20150723) 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 Scientific Linux Local Security Checks plugin family.
On the right side table select Scientific Linux Security Update : libuser on SL7.x x86_64 (20150723) plugin ID 85004.
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 sl_20150723_libuser_on_SL7_x.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a sl_20150723_libuser_on_SL7_x.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - sl_20150723_libuser_on_SL7_x.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 sl_20150723_libuser_on_SL7_x.nasl -t <IP/HOST>

Go back to menu.

References

IAVA | Information Assurance Vulnerability Alert:

2015-A-0179

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)
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)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file sl_20150723_libuser_on_SL7_x.nasl version 2.13. For more plugins, visit the Nessus Plugin Library.

Go back to menu.

Scientific Linux Security Update : libuser on SL7.x x86_64 (20150723) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

Nessus Plugin Library

Solving Problems with Office 365 Email from GoDaddy

Empire Module Library

CrackMapExec Module Library

Metasploit Android Modules

Top 16 Active Directory Vulnerabilities

Top 10 Vulnerabilities: Internal Infrastructure Pentest

Terminal Escape Injection

Cisco Password Cracking and Decrypting Guide

Capture Passwords using Wireshark

SSH Brute Force Attack Tool using PuTTY / Plink (ssh-putty-brute.ps1)

SMB Brute Force Attack Tool in PowerShell (SMBLogin.ps1)

Port Scanner in PowerShell (TCP/UDP)

Nessus CSV Parser and Extractor

Default Password Scanner (default-http-login-hunter.sh)