Amazon Linux 2023 : vim-common, vim-data, vim-default-editor (ALAS2023-2026-1940)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2026-1940.
##

include('compat.inc');

if (description)
{
  script_id(328511);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/20");

  script_cve_id(
    "CVE-2026-55693",
    "CVE-2026-55892",
    "CVE-2026-55895",
    "CVE-2026-57451",
    "CVE-2026-57453",
    "CVE-2026-57454",
    "CVE-2026-57455",
    "CVE-2026-57456"
  );

  script_name(english:"Amazon Linux 2023 : vim-common, vim-data, vim-default-editor (ALAS2023-2026-1940)");

  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 multiple vulnerabilities as referenced in the ALAS2023-2026-1940 advisory.

    Vim is an open source, command line text editor. Prior to 9.2.0653, the tree_count_words() function in
    src/spellfile.c fills in the word-count fields of a spell-file word trie by walking it iteratively with a
    depth counter. The counter is bounded only by the trie structure itself; it is never checked against the
    size of the fixed MAXWLEN-element stack arrays it indexes (arridx[], curi[], wordcount[]). A crafted
    .spl/.sug file pair, loaded when the user invokes spell suggestion, can drive the descent arbitrarily
    deep, so the function writes past the end of those arrays. This is a stack out-of-bounds write that
    corrupts the call frame and crashes the editor. This vulnerability is fixed in 9.2.0653. (CVE-2026-55693)

    Vim is an open source, command line text editor. Prior to 9.2.0662, the dump_prefixes() function in
    src/spell.c walks a spell-file prefix trie iteratively with a depth counter while dumping the prefixes
    that apply to a word. The counter is bounded only by the trie structure itself; it is never checked
    against the size of the fixed MAXWLEN-element stack arrays it indexes (prefix[], arridx[], curi[]). A
    crafted .spl file, loaded when the user dumps the word list, can drive the descent arbitrarily deep, so
    the function writes past the end of those arrays. This is a stack out-of-bounds write that corrupts the
    call frame and crashes the editor. This vulnerability is fixed in 9.2.0662. (CVE-2026-55892)

    Vim is an open source, command line text editor. Prior to 9.2.0663, a Vimscript code injection
    vulnerability exists in s:NetrwLocalRmFile() in the netrw plugin
    (runtime/pack/dist/opt/netrw/autoload/netrw.vim) when deleting a local file from the browser. A filename
    derived from the buffer's directory listing is interpolated into an Ex command line passed to :execute
    with only the backslash character escaped, allowing a crafted filename containing a bar (|) to terminate
    the intended command and execute arbitrary Vimscript, including shell commands via :call system() and :!.
    This vulnerability is fixed in 9.2.0663. (CVE-2026-55895)

    Vim is an open source, command line text editor. Prior to 9.2.0670, get_text_props() in src/textprop.c
    reads a uint16 property count stored inline after a line's text and returns it as the number of 32-byte
    textprop_T entries that follow. The only check is a floor that guarantees room for a single entry; the
    count is never checked against the amount of data actually present. A line that declares a large count
    while carrying little data causes consumers to read far past the end of the line buffer. Such a line can
    be delivered through a crafted undo file, leading to a crash. This vulnerability is fixed in 9.2.0670.
    (CVE-2026-57451)

    Vim is an open source, command line text editor. From 9.1.1784 until 9.2.0678, when the bundled zip plugin
    autoload/zip.vim falls back to PowerShell to browse, read, extract, update or delete entries in a zip
    archive, it builds the PowerShell command by inserting archive entry names that are quoted only for the
    shell, not for PowerShell. A crafted entry name can break out of the intended string context and cause
    PowerShell to execute arbitrary commands with the privileges of the user running Vim, triggered by
    opening, viewing or extracting the archive. This vulnerability is fixed in 9.2.0678. (CVE-2026-57453)

    Vim is an open source, command line text editor. From 9.2.0320 until 9.2.0679, a crafted undo or swap file
    can store a virtual-text property whose offset and length point outside the line's property data. When Vim
    restores or displays such a line it converts the offset into a pointer and reads the virtual text without
    bounds checking, causing an out-of-bounds read that can crash Vim or disclose adjacent heap memory. This
    vulnerability is fixed in 9.2.0679. (CVE-2026-57454)

    Vim is an open source, command line text editor. Prior to 9.2.0698, the single-byte branch of
    spell_soundfold_sofo() in src/spell.c translates a word through a spell file's SOFO (sound-folding) byte
    map into a caller-owned result buffer. Its copy loop advances the output index ri with no upper bound and
    terminates only on the input NUL, writing one byte per input byte into the MAXWLEN-element stack buffer
    the caller provides. A word longer than MAXWLEN, passed to soundfold() (or reached via sound-based spell
    suggestion) while a SOFO-based spell language is active, therefore writes past the end of that buffer.
    This is a stack out-of-bounds write that corrupts the call frame and crashes the editor. This
    vulnerability is fixed in 9.2.0698. (CVE-2026-57455)

    Vim is an open source, command line text editor. Prior to 9.2.0699, Vim's Python omni-completion
    (runtime/autoload/python3complete.vim and the legacy pythoncomplete.vim) executes reconstructed function
    and class definitions from the current buffer with exec() as part of populating the completion dictionary.
    When reconstructing that source, each scope's docstring is inserted verbatim between triple quotes with no
    escaping, so a hostile buffer can break out of the triple-quoted literal and execute attacker-controlled
    Python during omni-completion. This vulnerability is fixed in 9.2.0699. (CVE-2026-57456)

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

Note that Nessus has not tested for these issues 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/ALAS2023-2026-1940.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-55693.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-55892.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-55895.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-57451.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-57453.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-57454.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-57455.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-57456.html");
  script_set_attribute(attribute:"solution", value:
"Run 'dnf update vim --releasever 2023.12.20260720' or
  or 'dnf update --advisory ALAS2023-2026-1940 --releasever 2023.12.20260720' 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:N/UI:R/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:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-57456");

  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:"2026/06/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:vim-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:vim-data");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:vim-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:vim-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:vim-default-editor");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:vim-enhanced");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:vim-enhanced-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:vim-filesystem");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:vim-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:vim-minimal-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xxd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xxd-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2023");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 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("rpm2.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':'vim-common-9.2.725-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-common-9.2.725-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-data-9.2.725-1.amzn2023.0.1', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-debuginfo-9.2.725-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-debuginfo-9.2.725-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-debugsource-9.2.725-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-debugsource-9.2.725-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-default-editor-9.2.725-1.amzn2023.0.1', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-enhanced-9.2.725-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-enhanced-9.2.725-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-enhanced-debuginfo-9.2.725-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-enhanced-debuginfo-9.2.725-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-filesystem-9.2.725-1.amzn2023.0.1', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-minimal-9.2.725-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-minimal-9.2.725-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-minimal-debuginfo-9.2.725-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'vim-minimal-debuginfo-9.2.725-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xxd-9.2.725-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xxd-9.2.725-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xxd-debuginfo-9.2.725-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'xxd-debuginfo-9.2.725-1.amzn2023.0.1', '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, "vim-common / vim-data / vim-debuginfo / etc");
}