CentOS Linux 7 [TuxCare] Security Update: emacs-git / emacs-git-el / git / git-all / git-bzr / git-cvs / etc (CENTOS7:CLSA-2026:1768917823)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(351506);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/30");

  script_cve_id("CVE-2024-32021");
  script_xref(name:"CLSA", value:"2026:1768917823");

  script_name(english:"CentOS Linux 7 [TuxCare] Security Update: emacs-git / emacs-git-el / git / git-all / git-bzr / git-cvs / etc (CENTOS7:CLSA-2026:1768917823)");

  script_set_attribute(attribute:"synopsis", value:
"The CentOS Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The CentOS Linux 7 host has packages installed that are affected by a vulnerability as referenced in the TuxCare
CENTOS7:CLSA-2026:1768917823 advisory.

  - Git is a revision control system. Prior to versions 2.45.1, 2.44.1, 2.43.4, 2.42.2, 2.41.1, 2.40.2, and
    2.39.4, when cloning a local source repository that contains symlinks via the filesystem, Git may create
    hardlinks to arbitrary user-readable files on the same filesystem as the target repository in the
    `objects/` directory. Cloning a local repository over the filesystem may creating hardlinks to arbitrary
    user-owned files on the same filesystem in the target Git repository's `objects/` directory. When cloning
    a repository over the filesystem (without explicitly specifying the `file://` protocol or `--no-local`),
    the optimizations for local cloning will be used, which include attempting to hard link the object files
    instead of copying them. While the code includes checks against symbolic links in the source repository,
    which were added during the fix for CVE-2022-39253, these checks can still be raced because the hard link
    operation ultimately follows symlinks. If the object on the filesystem appears as a file during the check,
    and then a symlink during the operation, this will allow the adversary to bypass the check and create
    hardlinks in the destination objects directory to arbitrary, user-readable files. The problem has been
    patched in versions 2.45.1, 2.44.1, 2.43.4, 2.42.2, 2.41.1, 2.40.2, and 2.39.4. (CVE-2024-32021)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://security.tuxcare.com/csaf/v2/els_os/centos7els/advisories/2026/clsa-2026_1768917823.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3eeaac0f");
  script_set_attribute(attribute:"see_also", value:"https://cve.tuxcare.com/els/releases/CLSA-2026:1768917823");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages based on the guidance in TuxCare advisory CENTOS7:CLSA-2026:1768917823.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-32021");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/05/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/01/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CentOS 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/OS/extended-third-party", "Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list");

  exit(0);
}
include('rpm2.inc');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (empty_or_null(third_party_support) || third_party_support != 'TuxCare') exit(0, 'TuxCare support not enabled.');

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) || 'CentOS Linux' >!< os_product) audit(AUDIT_OS_NOT, 'CentOS Linux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'CentOS Linux');
if (! preg(pattern:"^7([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'CentOS Linux 7', 'CentOS Linux ' + os_version);

if (!get_kb_item('Host/CentOS/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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'CentOS Linux', cpu);


var constraints = [
  {
    'release': '7',
    'pkgs': [
      {'reference':'emacs-git-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'emacs-git-el-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-1.8.3.1-25.el7_9.tuxcare.els8', 'cpu':'x86_64', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-all-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-bzr-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-cvs-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-daemon-1.8.3.1-25.el7_9.tuxcare.els8', 'cpu':'x86_64', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-email-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-gnome-keyring-1.8.3.1-25.el7_9.tuxcare.els8', 'cpu':'x86_64', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-gui-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-hg-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-instaweb-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-p4-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-svn-1.8.3.1-25.el7_9.tuxcare.els8', 'cpu':'x86_64', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gitk-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gitweb-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'perl-Git-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'perl-Git-SVN-1.8.3.1-25.el7_9.tuxcare.els8', 'el_string':'el7_9', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

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_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, 'emacs-git / emacs-git-el / git / git-all / git-bzr / git-cvs / etc');
}