EulerOS 2.0 SP9 : git (EulerOS-SA-2021-2525)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

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

if (description)
{
  script_id(153674);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/01/20");

  script_cve_id("CVE-2020-5260", "CVE-2020-11008");

  script_name(english:"EulerOS 2.0 SP9 : git (EulerOS-SA-2021-2525)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the git packages installed, the EulerOS installation on the remote host is affected by the
following vulnerabilities :

  - Affected versions of Git have a vulnerability whereby Git can be tricked into sending private credentials
    to a host controlled by an attacker. This bug is similar to CVE-2020-5260(GHSA-qm7j-c969-7j4q). The fix
    for that bug still left the door open for an exploit where _some_ credential is leaked (but the attacker
    cannot control which one). Git uses external 'credential helper' programs to store and retrieve passwords
    or other credentials from secure storage provided by the operating system. Specially-crafted URLs that are
    considered illegal as of the recently published Git versions can cause Git to send a 'blank' pattern to
    helpers, missing hostname and protocol fields. Many helpers will interpret this as matching _any_ URL, and
    will return some unspecified stored password, leaking the password to an attacker's server. The
    vulnerability can be triggered by feeding a malicious URL to `git clone`. However, the affected URLs look
    rather suspicious; the likely vector would be through systems which automatically clone URLs not visible
    to the user, such as Git submodules, or package systems built around Git. The root of the problem is in
    Git itself, which should not be feeding blank input to helpers. However, the ability to exploit the
    vulnerability in practice depends on which helpers are in use. Credential helpers which are known to
    trigger the vulnerability: - Git's 'store' helper - Git's 'cache' helper - the 'osxkeychain' helper that
    ships in Git's 'contrib' directory Credential helpers which are known to be safe even with vulnerable
    versions of Git: - Git Credential Manager for Windows Any helper not in this list should be assumed to
    trigger the vulnerability. (CVE-2020-11008)

  - Affected versions of Git have a vulnerability whereby Git can be tricked into sending private credentials
    to a host controlled by an attacker. Git uses external 'credential helper' programs to store and retrieve
    passwords or other credentials from secure storage provided by the operating system. Specially-crafted
    URLs that contain an encoded newline can inject unintended values into the credential helper protocol
    stream, causing the credential helper to retrieve the password for one server (e.g., good.example.com) for
    an HTTP request being made to another server (e.g., evil.example.com), resulting in credentials for the
    former being sent to the latter. There are no restrictions on the relationship between the two, meaning
    that an attacker can craft a URL that will present stored credentials for any host to a host of their
    choosing. The vulnerability can be triggered by feeding a malicious URL to git clone. However, the
    affected URLs look rather suspicious; the likely vector would be through systems which automatically clone
    URLs not visible to the user, such as Git submodules, or package systems built around Git. The problem has
    been patched in the versions published on April 14th, 2020, going back to v2.17.x. Anyone wishing to
    backport the change further can do so by applying commit 9a6bbee (the full release includes extra checks
    for git fsck, but that commit is sufficient to protect clients against the vulnerability). The patched
    versions are: 2.17.4, 2.18.3, 2.19.4, 2.20.3, 2.21.2, 2.22.3, 2.23.2, 2.24.2, 2.25.3, 2.26.1.
    (CVE-2020-5260)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security
advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional
issues.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2021-2525
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2566aeab");
  script_set_attribute(attribute:"solution", value:
"Update the affected git packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/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:H/I:N/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-2020-5260");

  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:"2020/04/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/09/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/09/27");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:git");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:git-help");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:perl-Git");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
  script_exclude_keys("Host/EulerOS/uvp_version");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var release = get_kb_item("Host/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
var uvp = get_kb_item("Host/EulerOS/uvp_version");
if (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP9");

var sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(9)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP9");

if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP9", "EulerOS UVP " + uvp);

if (!get_kb_item("Host/EulerOS/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$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("aarch64" >!< cpu) audit(AUDIT_ARCH_NOT, "aarch64", cpu);

var flag = 0;

var pkgs = [
  "git-2.23.0-12.h5.eulerosv2r9",
  "git-help-2.23.0-12.h5.eulerosv2r9",
  "perl-Git-2.23.0-12.h5.eulerosv2r9"
];

foreach (var pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"9", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    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");
}