Vulnerabilities > CVE-2011-2921 - Improper Check for Dropped Privileges vulnerability in Ktsuss Project Ktsuss 1.3/1.4

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-2921
• https://www.openwall.com/lists/oss-security/2011/08/13/2
• https://security.gentoo.org/glsa/201201-15
• https://github.com/bcoles/local-exploits/blob/master/CVE-2011-2921/ktsuss-lpe.sh

#
# (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("compat.inc");

if (description)
{
  script_id(57721);
  script_version("1.9");
  script_cvs_date("Date: 2019/11/22");

  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) 2012-2019 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");
}