TencentOS Server 4: git (TSSA-2024:0952)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Tencent Linux Security Advisory TSSA-2024:0952.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(239881);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/20");

  script_cve_id("CVE-2024-32020", "CVE-2024-32021", "CVE-2024-32465");

  script_name(english:"TencentOS Server 4: git (TSSA-2024:0952)");

  script_set_attribute(attribute:"synopsis", value:
"The remote TencentOS Server 4 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 4 host is prior to tested version. It is,
therefore, affected by multiple vulnerabilities as referenced in the TSSA-2024:0952 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2024-32020:
    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, local clones may end up hardlinking files into the target repository's object database when source
    and target repository reside on the same disk. If the source repository is owned by a different user, then
    those hardlinked files may be rewritten at any point in time by the untrusted user. Cloning local
    repositories will cause Git to either copy or hardlink files of the source repository into the target
    repository. This significantly speeds up such local clones compared to doing a proper clone and saves
    both disk space and compute time. When cloning a repository located on the same disk that is owned by a
    different user than the current user we also end up creating such hardlinks. These files will continue to
    be owned and controlled by the potentially-untrusted user and can be rewritten by them at will in the
    future. 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:
    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-2024-32465:
    Git is a revision control system. The Git project recommends to avoid working in untrusted repositories,
    and instead to clone it first with `git clone --no-local` to obtain a clean copy. Git has specific
    protections to make that a safe operation even with an untrusted source repository, but vulnerabilities
    allow those protections to be bypassed. In the context of cloning local repositories owned by other users,
    this vulnerability has been covered in CVE-2024-32004. But there are circumstances where the fixes for
    CVE-2024-32004 are not enough: For example, when obtaining a `.zip` file containing a full copy of a Git
    repository, it should not be trusted by default to be safe, as e.g. hooks could be configured to run
    within the context of that repository. 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. As a workaround, avoid using Git in repositories that have been
    obtained via archives from untrusted sources.

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-20240952.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:P/AC:L/PR:N/UI:R/S:C/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-2024-32465");

  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:"2024/11/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/11/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/06/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:tencent:tencentos_server:4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:tencent:tencentos_server:git");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2025 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:"^4([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'TencentOS 4.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': '4',
    'pkgs': [
      {'reference':'git-2.41.1-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-2.41.1-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-all-2.41.1-1.tl4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-core-2.41.1-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-core-2.41.1-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-core-debuginfo-2.41.1-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-core-debuginfo-2.41.1-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-core-doc-2.41.1-1.tl4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-credential-libsecret-2.41.1-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-credential-libsecret-2.41.1-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-credential-libsecret-debuginfo-2.41.1-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-credential-libsecret-debuginfo-2.41.1-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-daemon-2.41.1-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-daemon-2.41.1-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-daemon-debuginfo-2.41.1-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-daemon-debuginfo-2.41.1-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-debugsource-2.41.1-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-debugsource-2.41.1-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-email-2.41.1-1.tl4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-gui-2.41.1-1.tl4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-instaweb-2.41.1-1.tl4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-p4-2.41.1-1.tl4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-subtree-2.41.1-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-subtree-2.41.1-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gitk-2.41.1-1.tl4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gitweb-2.41.1-1.tl4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'perl-Git-2.41.1-1.tl4', '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_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, 'git / git-all / git-core / etc');
}