GLSA-201612-39 : Bash: Arbitrary code execution

2016-12-13T00:00:00
ID GENTOO_GLSA-201612-39.NASL
Type nessus
Reporter Tenable
Modified 2018-01-26T00:00:00

Description

The remote host is affected by the vulnerability described in GLSA-201612-39 (Bash: Arbitrary code execution)

A vulnerability was found in the way Bash expands $HOSTNAME. Injecting       malicious code into $HOSTNAME could cause it to run each time Bash       expands \\h in the prompt string.

Impact :

A remote attacker controlling the system’s hostname (i.e. via DHCP)       could possibly execute arbitrary code with the privileges of the process,       or cause a Denial of       Service condition.

Workaround :

There is no known workaround at this time.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 201612-39.
#
# The advisory text is Copyright (C) 2001-2018 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(95742);
  script_version("$Revision: 3.3 $");
  script_cvs_date("$Date: 2018/01/26 17:15:57 $");

  script_cve_id("CVE-2016-0634");
  script_xref(name:"GLSA", value:"201612-39");

  script_name(english:"GLSA-201612-39 : Bash: Arbitrary code execution");
  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-201612-39
(Bash: Arbitrary code execution)

    A vulnerability was found in the way Bash expands $HOSTNAME. Injecting
      malicious code into $HOSTNAME could cause it to run each time Bash
      expands \\h in the prompt string.
  
Impact :

    A remote attacker controlling the system’s hostname (i.e. via DHCP)
      could possibly execute arbitrary code with the privileges of the process,
      or cause a Denial of
      Service condition.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/201612-39"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All Bash users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose '>=app-shells/bash-4.3_p46-r1'"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:bash");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/12/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/12/13");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2018 Tenable Network Security, Inc.");
  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:"app-shells/bash", unaffected:make_list("ge 4.3_p46-r1"), vulnerable:make_list("lt 4.3_p46-r1"))) flag++;

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