FreeBSD : emacs -- remote code execution vulnerability (c1e5f35e-f93d-11e1-b07f-00235a5f2c9a)

2012-09-10T00:00:00
ID FREEBSD_PKG_C1E5F35EF93D11E1B07F00235A5F2C9A.NASL
Type nessus
Reporter Tenable
Modified 2018-11-23T00:00:00

Description

Chong Yidong reports :

Paul Ling has found a security flaw in the file-local variables code in GNU Emacs.

When the Emacs user option enable-local-variables' is set to:safe' (the default value is t), Emacs should automatically refuse to evaluate eval' forms in file-local variable sections. Due to the bug, Emacs instead automatically evaluates sucheval' forms. Thus, if the user changes the value of enable-local-variables' to:safe', visiting a malicious file can cause automatic execution of arbitrary Emacs Lisp code with the permissions of the user.

The bug is present in Emacs 23.2, 23.3, 23.4, and 24.1.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2018 Jacques Vidrine and contributors
#
# Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
# HTML, PDF, PostScript, RTF and so forth) with or without modification,
# are permitted provided that the following conditions are met:
# 1. Redistributions of source code (VuXML) must retain the above
#    copyright notice, this list of conditions and the following
#    disclaimer as the first lines of this file unmodified.
# 2. Redistributions in compiled form (transformed to other DTDs,
#    published online in any format, converted to PDF, PostScript,
#    RTF and other formats) must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer
#    in the documentation and/or other materials provided with the
#    distribution.
# 
# THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

include("compat.inc");

if (description)
{
  script_id(62023);
  script_version("1.9");
  script_cvs_date("Date: 2018/11/23 12:49:57");

  script_cve_id("CVE-2012-3479");
  script_bugtraq_id(54969);

  script_name(english:"FreeBSD : emacs -- remote code execution vulnerability (c1e5f35e-f93d-11e1-b07f-00235a5f2c9a)");
  script_summary(english:"Checks for updated packages in pkg_info output");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote FreeBSD host is missing one or more security-related
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Chong Yidong reports :

Paul Ling has found a security flaw in the file-local variables code
in GNU Emacs.

When the Emacs user option `enable-local-variables' is set to `:safe'
(the default value is t), Emacs should automatically refuse to
evaluate `eval' forms in file-local variable sections. Due to the bug,
Emacs instead automatically evaluates such `eval' forms. Thus, if the
user changes the value of `enable-local-variables' to `:safe',
visiting a malicious file can cause automatic execution of arbitrary
Emacs Lisp code with the permissions of the user.

The bug is present in Emacs 23.2, 23.3, 23.4, and 24.1."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.gnu.org/archive/html/emacs-devel/2012-08/msg00802.html"
  );
  # http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12155
  script_set_attribute(
    attribute:"see_also",
    value:"https://debbugs.gnu.org/cgi/bugreport.cgi?bug=12155"
  );
  # https://vuxml.freebsd.org/freebsd/c1e5f35e-f93d-11e1-b07f-00235a5f2c9a.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?74c6d735"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:ND/RL:OF/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:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:emacs");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2012/08/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2012/09/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2012/09/10");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2012-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"FreeBSD Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info");

  exit(0);
}


include("audit.inc");
include("freebsd_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (pkg_test(save_report:TRUE, pkg:"emacs>24.*<24.2")) flag++;
if (pkg_test(save_report:TRUE, pkg:"emacs>23.*<=23.4_2")) flag++;

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