Fedora: Security Advisory for fail2ban (FEDORA-2021-a18b79d182)

# Copyright (C) 2021 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.

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.819077");
  script_version("2021-11-29T14:01:10+0000");
  script_cve_id("CVE-2021-32749");
  script_tag(name:"cvss_base", value:"6.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_tag(name:"last_modification", value:"2021-11-29 14:01:10 +0000 (Mon, 29 Nov 2021)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-07-27 16:39:00 +0000 (Tue, 27 Jul 2021)");
  script_tag(name:"creation_date", value:"2021-10-30 01:24:40 +0000 (Sat, 30 Oct 2021)");
  script_name("Fedora: Security Advisory for fail2ban (FEDORA-2021-a18b79d182)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("Fedora Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/fedora", "ssh/login/rpms", re:"ssh/login/release=FC35");

  script_xref(name:"Advisory-ID", value:"FEDORA-2021-a18b79d182");
  script_xref(name:"URL", value:"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZRYQ77MTX5WSV33VCJLK4KBKR55QZ7ZA");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'fail2ban'
  package(s) announced via the FEDORA-2021-a18b79d182 advisory.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable package version is present on the target host.");

  script_tag(name:"insight", value:"Fail2Ban scans log files and bans IP addresses that makes too many password
failures. It updates firewall rules to reject the IP address. These rules can
be defined by the user. Fail2Ban can read multiple log files such as sshd or
Apache web server ones.

Fail2Ban is able to reduce the rate of incorrect authentications attempts
however it cannot eliminate the risk that weak authentication presents.
Configure services to use only two factor or public/private authentication
mechanisms if you really want to protect services.

This is a meta-package that will install the default configuration.  Other
sub-packages are available to install support for other actions and
configurations.");

  script_tag(name:"affected", value:"'fail2ban' package(s) on Fedora 35.");

  script_tag(name:"solution", value:"Please install the updated package(s).");

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

  exit(0);
}

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

release = rpm_get_ssh_release();
if(!release)
  exit(0);

res = "";
report = "";

if(release == "FC35") {

  if(!isnull(res = isrpmvuln(pkg:"fail2ban", rpm:"fail2ban~0.11.2~9.fc35", rls:"FC35"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if(__pkg_match) {
    exit(99);
  }
  exit(0);
}

exit(0);