Slackware Linux 14.0 / 14.1 / 14.2 / 15.0 / current git Multiple Vulnerabilities (SSA:2023-046-02)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
#
# The descriptive text and package checks in this plugin were
# extracted from Slackware Security Advisory SSA:2023-046-02. The text
# itself is copyright (C) Slackware Linux, Inc.
##

include('compat.inc');

if (description)
{
  script_id(171515);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/09/11");

  script_cve_id("CVE-2022-39253", "CVE-2023-22490", "CVE-2023-23946");

  script_name(english:"Slackware Linux 14.0 / 14.1 / 14.2 / 15.0 / current git  Multiple Vulnerabilities (SSA:2023-046-02)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Slackware Linux host is missing a security update to git.");
  script_set_attribute(attribute:"description", value:
"The version of git installed on the remote host is prior to 2.30.8 / 2.35.7 / 2.39.2. It is, therefore, affected by
multiple vulnerabilities as referenced in the SSA:2023-046-02 advisory.

  - Git is an open source, scalable, distributed revision control system. Versions prior to 2.30.6, 2.31.5,
    2.32.4, 2.33.5, 2.34.5, 2.35.5, 2.36.3, and 2.37.4 are subject to exposure of sensitive information to a
    malicious actor. When performing a local clone (where the source and target of the clone are on the same
    volume), Git copies the contents of the source's `$GIT_DIR/objects` directory into the destination by
    either creating hardlinks to the source contents, or copying them (if hardlinks are disabled via `--no-
    hardlinks`). A malicious actor could convince a victim to clone a repository with a symbolic link pointing
    at sensitive information on the victim's machine. This can be done either by having the victim clone a
    malicious repository on the same machine, or having them clone a malicious repository embedded as a bare
    repository via a submodule from any source, provided they clone with the `--recurse-submodules` option.
    Git does not create symbolic links in the `$GIT_DIR/objects` directory. The problem has been patched in
    the versions published on 2022-10-18, and backported to v2.30.x. Potential workarounds: Avoid cloning
    untrusted repositories using the `--local` optimization when on a shared machine, either by passing the
    `--no-local` option to `git clone` or cloning from a URL that uses the `file://` scheme. Alternatively,
    avoid cloning repositories from untrusted sources with `--recurse-submodules` or run `git config --global
    protocol.file.allow user`. (CVE-2022-39253)

  - 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:"solution", value:
"Upgrade the affected git package.");
  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:"2022/10/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/02/15");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:slackware:slackware_linux:git");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:14.1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:14.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:15.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Slackware 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/Slackware/release", "Host/Slackware/packages");

  exit(0);
}

include("slackware.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Slackware/release")) audit(AUDIT_OS_NOT, "Slackware");
if (!get_kb_item("Host/Slackware/packages")) 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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Slackware", cpu);

var flag = 0;
var constraints = [
    { 'fixed_version' : '2.30.8', 'product' : 'git', 'os_name' : 'Slackware Linux', 'os_version' : '14.0', 'service_pack' : '1_slack14.0', 'arch' : 'i486' },
    { 'fixed_version' : '2.30.8', 'product' : 'git', 'os_name' : 'Slackware Linux', 'os_version' : '14.0', 'service_pack' : '1_slack14.0', 'arch' : 'x86_64' },
    { 'fixed_version' : '2.30.8', 'product' : 'git', 'os_name' : 'Slackware Linux', 'os_version' : '14.1', 'service_pack' : '1_slack14.1', 'arch' : 'i486' },
    { 'fixed_version' : '2.30.8', 'product' : 'git', 'os_name' : 'Slackware Linux', 'os_version' : '14.1', 'service_pack' : '1_slack14.1', 'arch' : 'x86_64' },
    { 'fixed_version' : '2.30.8', 'product' : 'git', 'os_name' : 'Slackware Linux', 'os_version' : '14.2', 'service_pack' : '1_slack14.2', 'arch' : 'i586' },
    { 'fixed_version' : '2.30.8', 'product' : 'git', 'os_name' : 'Slackware Linux', 'os_version' : '14.2', 'service_pack' : '1_slack14.2', 'arch' : 'x86_64' },
    { 'fixed_version' : '2.35.7', 'product' : 'git', 'os_name' : 'Slackware Linux', 'os_version' : '15.0', 'service_pack' : '1_slack15.0', 'arch' : 'i586' },
    { 'fixed_version' : '2.35.7', 'product' : 'git', 'os_name' : 'Slackware Linux', 'os_version' : '15.0', 'service_pack' : '1_slack15.0', 'arch' : 'x86_64' },
    { 'fixed_version' : '2.39.2', 'product' : 'git', 'os_name' : 'Slackware Linux', 'os_version' : 'current', 'service_pack' : '1', 'arch' : 'i586' },
    { 'fixed_version' : '2.39.2', 'product' : 'git', 'os_name' : 'Slackware Linux', 'os_version' : 'current', 'service_pack' : '1', 'arch' : 'x86_64' }
];

foreach constraint (constraints) {
    var pkg_arch = constraint['arch'];
    var arch = NULL;
    if (pkg_arch == "x86_64") {
        arch = pkg_arch;
    }
    if (slackware_check(osver:constraint['os_version'],
                        arch:arch,
                        pkgname:constraint['product'],
                        pkgver:constraint['fixed_version'],
                        pkgarch:pkg_arch,
                        pkgnum:constraint['service_pack'])) flag++;
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : slackware_report_get()
  );
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");