TencentOS Server 3: vim (TSSA-2026:0857)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Tencent Linux Security Advisory TSSA-2026:0857.
##

include('compat.inc');

if (description)
{
  script_id(337134);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/18");

  script_cve_id(
    "CVE-2026-46483",
    "CVE-2026-47162",
    "CVE-2026-47167",
    "CVE-2026-52858"
  );
  script_xref(name:"IAVA", value:"2026-A-0439-S");
  script_xref(name:"IAVA", value:"2026-A-0619");

  script_name(english:"TencentOS Server 3: vim (TSSA-2026:0857)");

  script_set_attribute(attribute:"synopsis", value:
"The remote TencentOS Server 3 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 3 host is prior to tested version. It is,
therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0857 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    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.

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-20260857.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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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-2026-47162");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-52858");

  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:"2026/05/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:tencent:tencentos_server:3");
  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:"^3([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'TencentOS 3.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': '3',
    'pkgs': [
      {'reference':'vim-common-8.0.1763-27.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-common-8.0.1763-27.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-common-debuginfo-8.0.1763-27.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-common-debuginfo-8.0.1763-27.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-debuginfo-8.0.1763-27.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-debuginfo-8.0.1763-27.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-debugsource-8.0.1763-27.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-debugsource-8.0.1763-27.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-enhanced-8.0.1763-27.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-enhanced-8.0.1763-27.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-enhanced-debuginfo-8.0.1763-27.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-enhanced-debuginfo-8.0.1763-27.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-filesystem-8.0.1763-27.tl3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-minimal-8.0.1763-27.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-minimal-8.0.1763-27.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-minimal-debuginfo-8.0.1763-27.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-minimal-debuginfo-8.0.1763-27.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-X11-8.0.1763-27.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-X11-8.0.1763-27.tl3', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-X11-debuginfo-8.0.1763-27.tl3', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
      {'reference':'vim-X11-debuginfo-8.0.1763-27.tl3', '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-X11-debuginfo / vim-common / etc');
}