Debian Security Advisory DSA 4377-1 (rssh - security update)

2019-01-30T00:00:00
ID OPENVAS:1361412562310704377
Type openvas
Reporter Copyright (c) 2019 Greenbone Networks GmbH http://greenbone.net
Modified 2019-07-04T00:00:00

Description

The ESnet security team discovered a vulnerability in rssh, a restricted shell that allows users to perform only scp, sftp, cvs, svnserve (Subversion), rdist and/or rsync operations. Missing validation in the scp support could result in the bypass of this restriction, allowing the execution of arbitrary shell commands.

Please note that with the update applied, the -3 option of scp can no longer be used.

                                        
                                            ###############################################################################
# OpenVAS Vulnerability Test
#
# Auto-generated from advisory DSA 4377-1 using nvtgen 1.0
# Script version: 1.0
#
# Author:
# Greenbone Networks
#
# Copyright:
# Copyright (c) 2019 Greenbone Networks GmbH http://greenbone.net
# Text descriptions are largely excerpted from the referenced
# advisory, and are Copyright (c) the respective author(s)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
###############################################################################

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.704377");
  script_version("2019-07-04T09:25:28+0000");
  script_cve_id("CVE-2019-1000018");
  script_name("Debian Security Advisory DSA 4377-1 (rssh - security update)");
  script_tag(name:"last_modification", value:"2019-07-04 09:25:28 +0000 (Thu, 04 Jul 2019)");
  script_tag(name:"creation_date", value:"2019-01-30 00:00:00 +0100 (Wed, 30 Jan 2019)");
  script_tag(name:"cvss_base", value:"4.6");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"package");

  script_xref(name:"URL", value:"https://www.debian.org/security/2019/dsa-4377.html");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (c) 2019 Greenbone Networks GmbH http://greenbone.net");
  script_family("Debian Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/debian_linux", "ssh/login/packages", re:"ssh/login/release=DEB9");
  script_tag(name:"affected", value:"rssh on Debian Linux");
  script_tag(name:"solution", value:"For the stable distribution (stretch), this problem has been fixed in
version 2.3.4-5+deb9u1.

We recommend that you upgrade your rssh packages.");

  script_xref(name:"URL", value:"https://security-tracker.debian.org/tracker/rssh");
  script_tag(name:"summary", value:"The ESnet security team discovered a vulnerability in rssh, a restricted
shell that allows users to perform only scp, sftp, cvs, svnserve
(Subversion), rdist and/or rsync operations. Missing validation in the
scp support could result in the bypass of this restriction, allowing the
execution of arbitrary shell commands.

Please note that with the update applied, the -3
option of scp can no
longer be used.");
  script_tag(name:"vuldetect", value:"This check tests the installed software version using the apt package manager.");

  exit(0);
}

include("revisions-lib.inc");
include("pkg-lib-deb.inc");

res = "";
report = "";
if(!isnull(res = isdpkgvuln(pkg:"rssh", ver:"2.3.4-5+deb9u1", rls:"DEB9"))) {
  report += res;
}

if(report != "") {
  security_message(data:report);
} else if (__pkg_match) {
  exit(99);
}