Ubuntu 18.04 LTS : Git regression (USN-5871-2)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5871-2. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(172055);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/16");

  script_cve_id("CVE-2023-22490");
  script_xref(name:"USN", value:"5871-2");

  script_name(english:"Ubuntu 18.04 LTS : Git regression (USN-5871-2)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 18.04 LTS host has packages installed that are affected by a vulnerability as referenced in the
USN-5871-2 advisory.

  - Git is a revision control system. Using a specially-crafted repository, Git prior to versions 2.39.2,
    2.38.4, 2.37.6, 2.36.5, 2.35.7, 2.34.7, 2.33.7, 2.32.6, 2.31.7, and 2.30.8 can be tricked into using its
    local clone optimization even when using a non-local transport. Though Git will abort local clones whose
    source `$GIT_DIR/objects` directory contains symbolic links, the `objects` directory itself may still be a
    symbolic link. These two may be combined to include arbitrary files based on known paths on the victim's
    filesystem within the malicious repository's working copy, allowing for data exfiltration in a similar
    manner as CVE-2022-39253. A fix has been prepared and will appear in v2.39.2 v2.38.4 v2.37.6 v2.36.5
    v2.35.7 v2.34.7 v2.33.7 v2.32.6, v2.31.7 and v2.30.8. If upgrading is impractical, two short-term
    workarounds are available. Avoid cloning repositories from untrusted sources with `--recurse-submodules`.
    Instead, consider cloning repositories without recursively cloning their submodules, and instead run `git
    submodule update` at each layer. Before doing so, inspect each new `.gitmodules` file to ensure that it
    does not contain suspicious module URLs. (CVE-2023-22490)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-5871-2");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/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:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-22490");

  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:"2023/02/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/03/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/03/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:git");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:git-all");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:git-cvs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:git-daemon-run");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:git-daemon-sysvinit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:git-el");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:git-email");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:git-gui");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:git-man");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:git-mediawiki");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:git-svn");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gitk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gitweb");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2023 Canonical, Inc. / NASL script (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 18.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '18.04', 'pkgname': 'git', 'pkgver': '1:2.17.1-1ubuntu0.17'},
    {'osver': '18.04', 'pkgname': 'git-all', 'pkgver': '1:2.17.1-1ubuntu0.17'},
    {'osver': '18.04', 'pkgname': 'git-cvs', 'pkgver': '1:2.17.1-1ubuntu0.17'},
    {'osver': '18.04', 'pkgname': 'git-daemon-run', 'pkgver': '1:2.17.1-1ubuntu0.17'},
    {'osver': '18.04', 'pkgname': 'git-daemon-sysvinit', 'pkgver': '1:2.17.1-1ubuntu0.17'},
    {'osver': '18.04', 'pkgname': 'git-el', 'pkgver': '1:2.17.1-1ubuntu0.17'},
    {'osver': '18.04', 'pkgname': 'git-email', 'pkgver': '1:2.17.1-1ubuntu0.17'},
    {'osver': '18.04', 'pkgname': 'git-gui', 'pkgver': '1:2.17.1-1ubuntu0.17'},
    {'osver': '18.04', 'pkgname': 'git-man', 'pkgver': '1:2.17.1-1ubuntu0.17'},
    {'osver': '18.04', 'pkgname': 'git-mediawiki', 'pkgver': '1:2.17.1-1ubuntu0.17'},
    {'osver': '18.04', 'pkgname': 'git-svn', 'pkgver': '1:2.17.1-1ubuntu0.17'},
    {'osver': '18.04', 'pkgname': 'gitk', 'pkgver': '1:2.17.1-1ubuntu0.17'},
    {'osver': '18.04', 'pkgname': 'gitweb', 'pkgver': '1:2.17.1-1ubuntu0.17'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'git / git-all / git-cvs / git-daemon-run / git-daemon-sysvinit / etc');
}