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nessusThis script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.AL2_ALAS-2021-1582.NASL
HistoryJan 07, 2021 - 12:00 a.m.

Amazon Linux 2 : net-snmp (ALAS-2021-1582)

2021-01-0700:00:00
This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
18

The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2021-1582 advisory.

  • Net-SNMP through 5.7.3 has Improper Privilege Management because SNMP WRITE access to the EXTEND MIB provides the ability to run arbitrary commands as root. (CVE-2020-15862)

Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.

##
# (C) Tenable Network Security, Inc.
#                                  
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2021-1582.
##

include('compat.inc');

if (description)
{
  script_id(144804);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/07");

  script_cve_id("CVE-2020-15862");
  script_xref(name:"ALAS", value:"2021-1582");

  script_name(english:"Amazon Linux 2 : net-snmp (ALAS-2021-1582)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by a
vulnerability as referenced in the ALAS2-2021-1582 advisory.

  - Net-SNMP through 5.7.3 has Improper Privilege Management because SNMP WRITE access to the EXTEND MIB
    provides the ability to run arbitrary commands as root. (CVE-2020-15862)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/AL2/ALAS-2021-1582.html");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-15862");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update net-snmp' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-15862");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/08/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/01/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/01/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:net-snmp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:net-snmp-agent-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:net-snmp-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:net-snmp-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:net-snmp-gui");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:net-snmp-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:net-snmp-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:net-snmp-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:net-snmp-sysvinit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:net-snmp-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Amazon Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "2")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

pkgs = [
    {'reference':'net-snmp-5.7.2-49.amzn2.1', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'net-snmp-5.7.2-49.amzn2.1', 'cpu':'i686', 'release':'AL2'},
    {'reference':'net-snmp-5.7.2-49.amzn2.1', 'cpu':'x86_64', 'release':'AL2'},
    {'reference':'net-snmp-agent-libs-5.7.2-49.amzn2.1', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'net-snmp-agent-libs-5.7.2-49.amzn2.1', 'cpu':'i686', 'release':'AL2'},
    {'reference':'net-snmp-agent-libs-5.7.2-49.amzn2.1', 'cpu':'x86_64', 'release':'AL2'},
    {'reference':'net-snmp-debuginfo-5.7.2-49.amzn2.1', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'net-snmp-debuginfo-5.7.2-49.amzn2.1', 'cpu':'i686', 'release':'AL2'},
    {'reference':'net-snmp-debuginfo-5.7.2-49.amzn2.1', 'cpu':'x86_64', 'release':'AL2'},
    {'reference':'net-snmp-devel-5.7.2-49.amzn2.1', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'net-snmp-devel-5.7.2-49.amzn2.1', 'cpu':'i686', 'release':'AL2'},
    {'reference':'net-snmp-devel-5.7.2-49.amzn2.1', 'cpu':'x86_64', 'release':'AL2'},
    {'reference':'net-snmp-gui-5.7.2-49.amzn2.1', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'net-snmp-gui-5.7.2-49.amzn2.1', 'cpu':'i686', 'release':'AL2'},
    {'reference':'net-snmp-gui-5.7.2-49.amzn2.1', 'cpu':'x86_64', 'release':'AL2'},
    {'reference':'net-snmp-libs-5.7.2-49.amzn2.1', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'net-snmp-libs-5.7.2-49.amzn2.1', 'cpu':'i686', 'release':'AL2'},
    {'reference':'net-snmp-libs-5.7.2-49.amzn2.1', 'cpu':'x86_64', 'release':'AL2'},
    {'reference':'net-snmp-perl-5.7.2-49.amzn2.1', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'net-snmp-perl-5.7.2-49.amzn2.1', 'cpu':'i686', 'release':'AL2'},
    {'reference':'net-snmp-perl-5.7.2-49.amzn2.1', 'cpu':'x86_64', 'release':'AL2'},
    {'reference':'net-snmp-python-5.7.2-49.amzn2.1', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'net-snmp-python-5.7.2-49.amzn2.1', 'cpu':'i686', 'release':'AL2'},
    {'reference':'net-snmp-python-5.7.2-49.amzn2.1', 'cpu':'x86_64', 'release':'AL2'},
    {'reference':'net-snmp-sysvinit-5.7.2-49.amzn2.1', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'net-snmp-sysvinit-5.7.2-49.amzn2.1', 'cpu':'i686', 'release':'AL2'},
    {'reference':'net-snmp-sysvinit-5.7.2-49.amzn2.1', 'cpu':'x86_64', 'release':'AL2'},
    {'reference':'net-snmp-utils-5.7.2-49.amzn2.1', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'net-snmp-utils-5.7.2-49.amzn2.1', 'cpu':'i686', 'release':'AL2'},
    {'reference':'net-snmp-utils-5.7.2-49.amzn2.1', 'cpu':'x86_64', 'release':'AL2'}
];

flag = 0;
foreach package_array ( pkgs ) {
  reference = NULL;
  release = NULL;
  cpu = NULL;
  el_string = NULL;
  rpm_spec_vers_cmp = NULL;
  allowmaj = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) release = package_array['release'];
  if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (reference && release) {
    if (rpm_check(release:release, cpu:cpu, reference:reference, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "net-snmp / net-snmp-agent-libs / net-snmp-debuginfo / etc");
}
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