GLSA-201201-15 : ktsuss: Privilege escalation - Nessus

Critical Plugin ID: 57721

This page contains detailed information about the GLSA-201201-15 : ktsuss: Privilege escalation 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: 57721
Name: GLSA-201201-15 : ktsuss: Privilege escalation
Filename: gentoo_GLSA-201201-15.nasl
Vulnerability Published: 2019-11-19
This Plugin Published: 2012-01-30
Last Modification Time: 2021-01-06
Plugin Version: 1.11
Plugin Type: local
Plugin Family: Gentoo Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/Gentoo/qpkg-list, Host/Gentoo/release, Host/local_checks_enabled

Vulnerability Information

Severity: Critical
Vulnerability Published: 2019-11-19
Patch Published: 2012-01-27
CVE [?]: CVE-2011-2921, CVE-2011-2922
CPE [?]: cpe:/o:gentoo:linux, p-cpe:/a:gentoo:linux:ktsuss

Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-201201-15 (ktsuss: Privilege escalation)

Two vulnerabilities have been found in ktuss: Under specific circumstances, ktsuss skips authentication and fails to change the effective UID back to the real UID (CVE-2011-2921). The GTK interface spawned by the ktsuss binary is run as root (CVE-2011-2922). Impact :

A local attacker could gain escalated privileges and use the 'GTK_MODULES' environment variable to possibly execute arbitrary code with root privileges. Workaround :

There is no known workaround at this time.

Solution

Gentoo discontinued support for ktsuss. We recommend that users unmerge ktsuss: # emerge --unmerge 'x11-misc/ktsuss'

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the GLSA-201201-15 : ktsuss: Privilege escalation vulnerability:

Metasploit: exploit/linux/local/ktsuss_suid_priv_esc
[ktsuss suid Privilege Escalation]
Exploit-DB: exploits/linux/local/47344.rb
[EDB-47344: ktsuss 1.4 - suid Privilege Escalation (Metasploit)]
GitHub: https://github.com/bcoles/local-exploits
[CVE-2011-2921]

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/E:U/RL:OF/RC:C

CVSS Base Score:	10.0 (High)
Impact Subscore:	10.0
Exploitability Subscore:	10.0
CVSS Temporal Score:	7.4 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.4 (High)

CVSS V3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS Base Score:	9.8 (Critical)
Impact Subscore:	5.9
Exploitability Subscore:	3.9
CVSS Temporal Score:	8.5 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.5 (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 Gentoo Linux Security Advisory GLSA 201201-15.
#
# The advisory text is Copyright (C) 2001-2019 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

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

if (description)
{
  script_id(57721);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");

  script_cve_id("CVE-2011-2921", "CVE-2011-2922");
  script_bugtraq_id(49151);
  script_xref(name:"GLSA", value:"201201-15");

  script_name(english:"GLSA-201201-15 : ktsuss: Privilege escalation");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote host is affected by the vulnerability described in GLSA-201201-15
(ktsuss: Privilege escalation)

    Two vulnerabilities have been found in ktuss:
      Under specific circumstances, ktsuss skips authentication and fails
        to change the effective UID back to the real UID (CVE-2011-2921).
      The GTK interface spawned by the ktsuss binary is run as root
        (CVE-2011-2922).
  
Impact :

    A local attacker could gain escalated privileges and use the
      'GTK_MODULES' environment variable to possibly execute arbitrary code
      with root privileges.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/201201-15"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Gentoo discontinued support for ktsuss. We recommend that users unmerge
      ktsuss:
      # emerge --unmerge 'x11-misc/ktsuss'"
  );
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"metasploit_name", value:'ktsuss suid 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:gentoo:linux:ktsuss");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/11/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2012/01/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2012/01/30");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2012-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Gentoo Local Security Checks");

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

  exit(0);
}


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

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"x11-misc/ktsuss", unaffected:make_list(), vulnerable:make_list("le 1.4"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:qpkg_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ktsuss");
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/gentoo_GLSA-201201-15.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\gentoo_GLSA-201201-15.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/gentoo_GLSA-201201-15.nasl

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How to Run

Here is how to run the GLSA-201201-15 : ktsuss: Privilege escalation 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 Gentoo Local Security Checks plugin family.
On the right side table select GLSA-201201-15 : ktsuss: Privilege escalation plugin ID 57721.
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 gentoo_GLSA-201201-15.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a gentoo_GLSA-201201-15.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - gentoo_GLSA-201201-15.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 gentoo_GLSA-201201-15.nasl -t <IP/HOST>

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References

BID | SecurityFocus Bugtraq ID:

49151

GLSA | Gentoo Linux Security Advisory:

201201-15

See also:

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Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file gentoo_GLSA-201201-15.nasl version 1.11. For more plugins, visit the Nessus Plugin Library.

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GLSA-201201-15 : ktsuss: Privilege escalation - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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