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nessusThis script is Copyright (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.ALMA_LINUX_ALSA-2022-4799.NASL
HistoryJun 06, 2022 - 12:00 a.m.

AlmaLinux 8 : rsyslog (ALSA-2022:4799)

2022-06-0600:00:00
This script is Copyright (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
33

The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2022:4799 advisory.

  • Rsyslog is a rocket-fast system for log processing. Modules for TCP syslog reception have a potential heap buffer overflow when octet-counted framing is used. This can result in a segfault or some other malfunction. As of our understanding, this vulnerability can not be used for remote code execution. But there may still be a slight chance for experts to do that. The bug occurs when the octet count is read.
    While there is a check for the maximum number of octets, digits are written to a heap buffer even when the octet count is over the maximum, This can be used to overrun the memory buffer. However, once the sequence of digits stop, no additional characters can be added to the buffer. In our opinion, this makes remote exploits impossible or at least highly complex. Octet-counted framing is one of two potential framing modes. It is relatively uncommon, but enabled by default on receivers. Modules imtcp, imptcp, imgssapi, and imhttp are used for regular syslog message reception. It is best practice not to directly expose them to the public. When this practice is followed, the risk is considerably lower. Module imdiag is a diagnostics module primarily intended for testbench runs. We do not expect it to be present on any production installation. Octet-counted framing is not very common. Usually, it needs to be specifically enabled at senders. If users do not need it, they can turn it off for the most important modules. This will mitigate the vulnerability. (CVE-2022-24903)

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

##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# AlmaLinux Security Advisory ALSA-2022:4799.
##

include('compat.inc');

if (description)
{
  script_id(161901);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/06/06");

  script_cve_id("CVE-2022-24903");
  script_xref(name:"ALSA", value:"2022:4799");

  script_name(english:"AlmaLinux 8 : rsyslog (ALSA-2022:4799)");

  script_set_attribute(attribute:"synopsis", value:
"The remote AlmaLinux host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the
ALSA-2022:4799 advisory.

  - Rsyslog is a rocket-fast system for log processing. Modules for TCP syslog reception have a potential heap
    buffer overflow when octet-counted framing is used. This can result in a segfault or some other
    malfunction. As of our understanding, this vulnerability can not be used for remote code execution. But
    there may still be a slight chance for experts to do that. The bug occurs when the octet count is read.
    While there is a check for the maximum number of octets, digits are written to a heap buffer even when the
    octet count is over the maximum, This can be used to overrun the memory buffer. However, once the sequence
    of digits stop, no additional characters can be added to the buffer. In our opinion, this makes remote
    exploits impossible or at least highly complex. Octet-counted framing is one of two potential framing
    modes. It is relatively uncommon, but enabled by default on receivers. Modules `imtcp`, `imptcp`,
    `imgssapi`, and `imhttp` are used for regular syslog message reception. It is best practice not to
    directly expose them to the public. When this practice is followed, the risk is considerably lower. Module
    `imdiag` is a diagnostics module primarily intended for testbench runs. We do not expect it to be present
    on any production installation. Octet-counted framing is not very common. Usually, it needs to be
    specifically enabled at senders. If users do not need it, they can turn it off for the most important
    modules. This will mitigate the vulnerability. (CVE-2022-24903)

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://errata.almalinux.org/8/ALSA-2022-4799.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/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-2022-24903");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/05/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/05/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/06/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-crypto");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-elasticsearch");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-gssapi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-kafka");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-mmaudit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-mmfields");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-mmjsonparse");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-mmkubernetes");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-mmnormalize");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-mmsnmptrapd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-mysql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-omamqp1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-pgsql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-relp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-snmp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:rsyslog-udpspoof");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item('Host/AlmaLinux/release');
if (isnull(release) || 'AlmaLinux' >!< release) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_ver = pregmatch(pattern: "AlmaLinux release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
var os_ver = os_ver[1];
if (! preg(pattern:"^8([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'AlmaLinux 8.x', 'AlmaLinux ' + os_ver);

if (!get_kb_item('Host/AlmaLinux/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'AlmaLinux', cpu);

var pkgs = [
    {'reference':'rsyslog-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-crypto-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-doc-8.2102.0-7.el8', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-elasticsearch-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-gnutls-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-gssapi-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-kafka-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-mmaudit-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-mmfields-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-mmjsonparse-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-mmkubernetes-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-mmnormalize-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-mmsnmptrapd-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-mysql-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-omamqp1-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-openssl-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-pgsql-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-relp-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-snmp-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rsyslog-udpspoof-8.2102.0-7.el8', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var release = NULL;
  var sp = NULL;
  var cpu = NULL;
  var el_string = NULL;
  var rpm_spec_vers_cmp = NULL;
  var epoch = NULL;
  var allowmaj = NULL;
  var exists_check = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) release = 'Alma-' + package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  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['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (reference && release && (!exists_check || rpm_exists(release:release, rpm:exists_check))) {
    if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'rsyslog / rsyslog-crypto / rsyslog-doc / rsyslog-elasticsearch / etc');
}