TencentOS Server 2: vim (TSSA-2026:1367)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Tencent Linux Security Advisory TSSA-2026:1367.
##

include('compat.inc');

if (description)
{
  script_id(375717);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/11/04");

  script_cve_id(
    "CVE-2026-34982",
    "CVE-2026-35177",
    "CVE-2026-41411",
    "CVE-2026-46483",
    "CVE-2026-47162",
    "CVE-2026-47167",
    "CVE-2026-52858",
    "CVE-2026-55693",
    "CVE-2026-57455",
    "CVE-2026-57456",
    "CVE-2026-59858",
    "CVE-2026-73072",
    "CVE-2026-73076",
    "CVE-2026-73078"
  );
  script_xref(name:"IAVA", value:"2026-A-0294-S");
  script_xref(name:"IAVA", value:"2026-A-0413-S");
  script_xref(name:"IAVA", value:"2026-A-0439-S");
  script_xref(name:"IAVA", value:"2026-A-0516-S");
  script_xref(name:"IAVA", value:"2026-A-0619");
  script_xref(name:"IAVA", value:"2026-A-0630-S");
  script_xref(name:"IAVA", value:"2026-A-0846");

  script_name(english:"TencentOS Server 2: vim (TSSA-2026:1367)");

  script_set_attribute(attribute:"synopsis", value:
"The remote TencentOS Server 2 host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The version of Tencent Linux installed on the remote TencentOS Server 2 host is prior to tested version. It is,
therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:1367 advisory.

    Package updates are available for TencentOS Server 2 that fix the following vulnerabilities:

    CVE-2026-34982:
    Vim is an open source, command line text editor. Prior to version 9.2.0276, a modeline sandbox bypass in
    Vim allows arbitrary OS command execution when a user opens a crafted file. The complete, guitabtooltip
    and printheader options are missing the P_MLE flag, allowing a modeline to be executed. Additionally, the
    mapset() function lacks a check_secure() call, allowing it to be abused from sandboxed expressions. Commit
    9.2.0276 fixes the issue.

    CVE-2026-35177:
    Vim is an open source, command line text editor. Prior to 9.2.0280, a path traversal bypass in Vim's
    zip.vim plugin allows overwriting of arbitrary files when opening specially crafted zip archives,
    circumventing the previous fix for CVE-2025-53906. This vulnerability is fixed in 9.2.0280.

    CVE-2026-41411:
    Vim is an open source, command line text editor. Prior to 9.2.0357, A command injection vulnerability
    exists in Vim's tag file processing. When resolving a tag, the filename field from the tags file is passed
    through wildcard expansion to resolve environment variables and wildcards. If the filename field contains
    backtick syntax (e.g., command), Vim executes the embedded command via the system shell with the full
    privileges of the running user.

    CVE-2026-46483:
    Vim is an open source, command line text editor. Prior to 9.2.0479, a command injection vulnerability
    exists in tar#Vimuntar() in
    runtime/autoload/tar.vim when decompressing .tgz archives on Unix-like systems. The function builds
    :!gunzip and :!gzip -d commands using shellescape(tartail) without the {special} flag, allowing a crafted
    archive filename to trigger Vim cmdline-special expansion and execute shell commands in the user's
    context. This vulnerability is fixed in 9.2.0479.

    CVE-2026-47162:
    Vim is an open source, command line text editor. Prior to version 9.2.0495, a Vimscript code injection
    vulnerability exists in s:NetrwBookHistSave() in the netrw plugin
    (runtime/pack/dist/opt/netrw/autoload/netrw.vim) when serializing browsed directory paths to the history
    file ~/.vim/.netrwhist. A directory name derived from the filesystem is interpolated into a single-quoted
    Vimscript string literal without escaping embedded single quotes, allowing a crafted directory name to
    break out of the string context and execute arbitrary Vimscript, including shell commands via system() and
    :!, the next time the history file is sourced. This issue has been patched in version 9.2.0495.

    CVE-2026-47167:
    Vim is an open source, command line text editor. Prior to version 9.2.0496, a code injection vulnerability
    exists in s:stepmatch() in the cucumber filetype plugin (runtime/ftplugin/cucumber.vim) on Vim builds with
    +ruby support. Step-definition patterns read from .rb files under the repository's features/*/ or
    stories/*/ directories are embedded into a Ruby Kernel.eval argument without sufficient escaping, allowing
    a crafted pattern in an attacker-controlled repository to execute arbitrary Ruby (and through it arbitrary
    shell commands) when the user invokes a step-jump mapping ([d, ]d). This issue has been patched in version
    9.2.0496.

    CVE-2026-52858:
    Vim is an open source, command line text editor. Prior to version 9.2.0561, the Python omni-completion
    script in python3complete.vim for Vim with the +python3 interpreter enabled (and the legacy
    pythoncomplete.vim for builds with the +python interpreter) executes the import and from statements found
    in the current buffer through Python's import machinery. Because the buffer's working directory is on
    sys.path, opening a hostile .py file with a sibling Python package and invoking omni-completion runs that
    package's top-level code as the editing user. This issue has been patched in version 9.2.0561.

    CVE-2026-55693:
    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-2026-57455:
    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-2026-57456:
    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-2026-59858:
    Vim is an open source, command line text editor. Prior to 9.2.0735, the C omni-completion script in
    runtime/autoload/ccomplete.vim interpolates the typeref: or typename: extension field of a tags entry,
    without escaping, into a :vimgrep pattern that is run through :execute. Because :vimgrep honors the bar as
    a command separator, a crafted tag field can close the search pattern and append an arbitrary Ex command;
    opening a hostile .c file whose project tags file contains such an entry and invoking C omni-completion
    runs that command as the editing user. This issue is fixed in version 9.2.0735.

    CVE-2026-73072:
    Vim is an open source, command line text editor. Prior to 9.2.0846, set_sofo() in src/spellfile.c reuses
    sl_sal_first[] without resetting values left by set_sal_first(), so a crafted spell file containing an
    SN_SAL section before an SN_SOFO section causes under-counted mapping lists and attacker-influenced writes
    beyond a heap allocation. This issue is fixed in version 9.2.0846.

    CVE-2026-73076:
    Vim is an open source, command line text editor. Prior to 9.2.0847, runtime/autoload/vimball.vim allows a
    crafted vimball member named .VimballRecord to overwrite the installation record with attacker-chosen
    commands. When vimball#RmVimball() later processes the matching record entry, the stored Ex commands,
    including operating-system commands invoked through :!, execute with the privileges of the user running
    Vim. This issue is fixed in version 9.2.0847.

    CVE-2026-73078:
    Vim is an open source, command line text editor. Prior to 9.2.0840, runtime/plugin/netrwPlugin.vim loads
    netrw and runtime/pack/dist/opt/netrw/autoload/netrw.vim constructs Bookmarks, History, and Targets menu
    entries by interpolating attacker-controlled directory paths into executed :menu commands.
    s:NetrwBookmarkMenu(), s:NetrwTgtMenu(), g:netrw_menu_escape, EX_TRLBAR, and netrw#MakeTgt() fail to
    neutralize the | command separator or single quotes at five construction sites, allowing a crafted path
    browsed or bookmarked in GUI Vim to execute arbitrary Ex and operating-system commands. This issue is
    fixed in version 9.2.0840.

Tenable has extracted the preceding description block directly from the Tencent Linux 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://mirrors.tencent.com/tlinux/errata/tssa-20261367.xml");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/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:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-73078");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/04/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/11/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:tencent:tencentos_server:2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:tencent:tencentos_server:vim");
  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:"Tencent 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_info2.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/etc/os-release", "Host/TencentOS/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'TencentOS' >!< os_product) audit(AUDIT_OS_NOT, 'TencentOS');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'TencentOS');
if (! preg(pattern:"^2([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'TencentOS 2.x', 'TencentOS ' + os_version);

if (!get_kb_item('Host/TencentOS/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, 'TencentOS', cpu);

var constraints = [
  {
    'release': '2',
    'pkgs': [
      {'reference':'vim-common-7.4.629-8.tl2.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-debuginfo-7.4.629-8.tl2.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-enhanced-7.4.629-8.tl2.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-filesystem-7.4.629-8.tl2.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-minimal-7.4.629-8.tl2.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-X11-7.4.629-8.tl2.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(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-X11 / vim-common / vim-debuginfo / etc');
}