TencentOS Server 2: git (TSSA-2023:0030)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Tencent Linux Security Advisory TSSA-2023:0030.
##

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

if (description)
{
  script_id(238946);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/05");

  script_cve_id("CVE-2022-23521", "CVE-2022-41903");

  script_name(english:"TencentOS Server 2: git (TSSA-2023:0030)");

  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-2023:0030 advisory.

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

      CVE-2022-23521:
      A flaw was found in Git, a distributed revision control system. When parsing gitattributes, a mechanism
    to allow defining attributes for paths, multiple integer overflows can occur when there is a huge number
    of path patterns, attributes for a single pattern, or declared attribute names. These overflows can be
    triggered via a crafted .gitattributes file that may be part of the commit history. Git silently splits
    lines longer than 2KB when parsing gitattributes from a file, but not when parsing them from the index.
    Consequentially, the failure mode depends on whether the file exists in the working tree, the index, or
    both. This integer overflow can result in arbitrary heap reads and writes, which may allow remote code
    execution.

      CVE-2022-41903:
      A flaw was found in Git, a distributed revision control system. This issue occurs due to an integer
    overflow in pretty.c::format_and_pad_commit(), where a size_t is stored improperly as an int, and then
    added as an offset to a memcpy(). This overflow can be triggered directly by a user running a command
    which invokes the commit formatting machinery (e.g., git log --format=...). It may also be triggered
    indirectly through the git archive via the export-subst mechanism, which expands format specifiers inside
    files within the repository during a git archive. This integer overflow can result in arbitrary heap
    writes, which may allow arbitrary code execution.

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-20230030.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:N/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:"cvss_score_source", value:"CVE-2022-41903");

  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:"2023/03/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/03/09");
  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:2");
  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:"^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':'emacs-git-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'emacs-git-el-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-all-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-bzr-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-cvs-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-daemon-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-debuginfo-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-email-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-gnome-keyring-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-gui-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-hg-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-instaweb-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-p4-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'git-svn-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gitk-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gitweb-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'perl-Git-1.8.3.1-24.el7_9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'perl-Git-SVN-1.8.3.1-24.el7_9', 'cpu':'x86_64', '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, 'emacs-git / emacs-git-el / git / etc');
}