Debian DLA-3338-1 : git - LTS security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-3338. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(171870);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/09/11");

  script_cve_id("CVE-2023-22490", "CVE-2023-23946");

  script_name(english:"Debian DLA-3338-1 : git - LTS security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-3338 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)

  - Git, a revision control system, is vulnerable to path traversal 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. By feeding a crafted input to `git apply`, a
    path outside the working tree can be overwritten as the user who is running `git apply`. 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. As a workaround, use `git apply --stat` to inspect a patch before applying; avoid
    applying one that creates a symbolic link and then creates a file beyond the symbolic link.
    (CVE-2023-23946)

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://security-tracker.debian.org/tracker/source-package/git");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/lts/security/2023/dla-3338");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2023-22490");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2023-23946");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/git");
  script_set_attribute(attribute:"solution", value:
"Upgrade the git packages.

For Debian 10 buster, these problems have been fixed in version 1");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/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:N/AC:L/PR:N/UI:N/S:U/C:N/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-2023-23946");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/02/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/02/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/02/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:git");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:git-all");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:git-cvs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:git-daemon-run");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:git-daemon-sysvinit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:git-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:git-el");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:git-email");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:git-gui");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:git-man");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:git-mediawiki");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:git-svn");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gitk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gitweb");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/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);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(10)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 10.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '10.0', 'prefix': 'git', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'git-all', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'git-cvs', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'git-daemon-run', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'git-daemon-sysvinit', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'git-doc', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'git-el', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'git-email', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'git-gui', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'git-man', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'git-mediawiki', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'git-svn', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'gitk', 'reference': '1:2.20.1-2+deb10u8'},
    {'release': '10.0', 'prefix': 'gitweb', 'reference': '1:2.20.1-2+deb10u8'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_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');
}