FreeBSD : gzip -- directory traversal and permission race vulnerabilities (63bd4bad-dffe-11d9-b875-0001020eed82)

2005-07-13T00:00:00
ID FREEBSD_PKG_63BD4BADDFFE11D9B8750001020EED82.NASL
Type nessus
Reporter Tenable
Modified 2013-06-21T00:00:00

Description

Problem Description Two problems related to extraction of files exist in gzip :

The first problem is that gzip does not properly sanitize filenames containing '/' when uncompressing files using the -N command line option.

The second problem is that gzip does not set permissions on newly extracted files until after the file has been created and the file descriptor has been closed. Impact The first problem can allow an attacker to overwrite arbitrary local files when uncompressing a file using the -N command line option.

The second problem can allow a local attacker to change the permissions of arbitrary local files, on the same partition as the one the user is uncompressing a file on, by removing the file the user is uncompressing and replacing it with a hardlink before the uncompress operation is finished. Workaround Do not use the -N command line option on untrusted files and do not uncompress files in directories where untrusted users have write access.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2013 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(18960);
  script_version("$Revision: 1.14 $");
  script_cvs_date("$Date: 2013/06/21 23:57:17 $");

  script_cve_id("CVE-2005-0988", "CVE-2005-1228");
  script_osvdb_id(15487, 15721);
  script_xref(name:"FreeBSD", value:"SA-05:11.gzip");

  script_name(english:"FreeBSD : gzip -- directory traversal and permission race vulnerabilities (63bd4bad-dffe-11d9-b875-0001020eed82)");
  script_summary(english:"Checks for updated package in pkg_info output");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote FreeBSD host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Problem Description Two problems related to extraction of files exist
in gzip :

The first problem is that gzip does not properly sanitize filenames
containing '/' when uncompressing files using the -N command line
option.

The second problem is that gzip does not set permissions on newly
extracted files until after the file has been created and the file
descriptor has been closed. Impact The first problem can allow an
attacker to overwrite arbitrary local files when uncompressing a file
using the -N command line option.

The second problem can allow a local attacker to change the
permissions of arbitrary local files, on the same partition as the one
the user is uncompressing a file on, by removing the file the user is
uncompressing and replacing it with a hardlink before the uncompress
operation is finished. Workaround Do not use the -N command line
option on untrusted files and do not uncompress files in directories
where untrusted users have write access."
  );
  # http://marc.theaimsgroup.com/?l=bugtraq&m=111271860708210
  script_set_attribute(
    attribute:"see_also",
    value:"http://marc.info/?l=bugtraq&m=111271860708210"
  );
  # http://marc.theaimsgroup.com/?l=bugtraq&m=111402732406477
  script_set_attribute(
    attribute:"see_also",
    value:"http://marc.info/?l=bugtraq&m=111402732406477"
  );
  # http://www.freebsd.org/ports/portaudit/63bd4bad-dffe-11d9-b875-0001020eed82.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?dc2f1765"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:gzip");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2005/04/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2005/06/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2005/07/13");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2005-2013 Tenable Network Security, Inc.");
  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:"gzip<1.3.5_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");