Amazon Linux 2023 : xz, xz-devel, xz-libs (ALAS2023-2023-042)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2023-042.
##

include('compat.inc');

if (description)
{
  script_id(173099);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/21");

  script_cve_id("CVE-2022-1271");
  script_xref(name:"IAVA", value:"2024-A-0327-S");

  script_name(english:"Amazon Linux 2023 : xz, xz-devel, xz-libs (ALAS2023-2023-042)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2023 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2023-042 advisory.

    An arbitrary file write vulnerability was found in GNU gzip's zgrep utility. When zgrep is applied on the
    attacker's chosen file name (for example, a crafted file name), this can overwrite an attacker's content
    to an arbitrary attacker-selected file. This flaw occurs due to insufficient validation when processing
    filenames with two or more newlines where selected content and the target file names are embedded in
    crafted multi-line file names. This flaw allows a remote, low privileged attacker to force zgrep to write
    arbitrary files on the system. (CVE-2022-1271)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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/AL2023/ALAS-2023-042.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-1271.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
  script_set_attribute(attribute:"solution", value:
"Run 'dnf update xz --releasever=2023.0.20230222 ' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/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:N/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-2022-1271");

  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:"2022/04/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/02/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/03/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xz");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xz-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xz-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xz-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xz-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xz-libs-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xz-lzma-compat");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xz-lzma-compat-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xz-static");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2023");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2023-2026 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("rpm.inc");

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

var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "-2023")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2023", "Amazon Linux " + os_ver);
}

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

var pkgs = [
    {'reference':'xz-5.2.5-9.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-5.2.5-9.amzn2023.0.2', 'cpu':'i686', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-5.2.5-9.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-debuginfo-5.2.5-9.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-debuginfo-5.2.5-9.amzn2023.0.2', 'cpu':'i686', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-debuginfo-5.2.5-9.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-debugsource-5.2.5-9.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-debugsource-5.2.5-9.amzn2023.0.2', 'cpu':'i686', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-debugsource-5.2.5-9.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-devel-5.2.5-9.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-devel-5.2.5-9.amzn2023.0.2', 'cpu':'i686', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-devel-5.2.5-9.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-libs-5.2.5-9.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-libs-5.2.5-9.amzn2023.0.2', 'cpu':'i686', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-libs-5.2.5-9.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-libs-debuginfo-5.2.5-9.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-libs-debuginfo-5.2.5-9.amzn2023.0.2', 'cpu':'i686', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-libs-debuginfo-5.2.5-9.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-lzma-compat-5.2.5-9.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-lzma-compat-5.2.5-9.amzn2023.0.2', 'cpu':'i686', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-lzma-compat-5.2.5-9.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-lzma-compat-debuginfo-5.2.5-9.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-lzma-compat-debuginfo-5.2.5-9.amzn2023.0.2', 'cpu':'i686', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-lzma-compat-debuginfo-5.2.5-9.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-static-5.2.5-9.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-static-5.2.5-9.amzn2023.0.2', 'cpu':'i686', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xz-static-5.2.5-9.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', '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;
  var cves = 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['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 (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  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, cves:cves)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      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, "xz / xz-debuginfo / xz-debugsource / etc");
}