EulerOS 2.0 SP8 : git (EulerOS-SA-2021-1870)

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

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

if (description)
{
  script_id(149563);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/01");

  script_cve_id("CVE-2021-21300");

  script_name(english:"EulerOS 2.0 SP8 : git (EulerOS-SA-2021-1870)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"According to the version of the git packages installed, the EulerOS
installation on the remote host is affected by the following
vulnerability :

  - Git is an open-source distributed revision control
    system. In affected versions of Git a specially crafted
    repository that contains symbolic links as well as
    files using a clean/smudge filter such as Git LFS,may
    cause just-checked out script to be executed while
    cloning onto a case-insensitive file system such as
    NTFS,HFS+ or APFS (i.e. the default file systems on
    Windows and macOS). Note that clean/smudge filters have
    to be configured for that. Git for Windows configures
    Git LFS by default,and is therefore vulnerable. The
    problem has been patched in the versions published on
    Tuesday,March 9th,2021. As a workaound,if symbolic link
    support is disabled in Git (e.g. via `git config
    --global core.symlinks false`),the described attack
    won't work. Likewise,if no clean/smudge filters such as
    Git LFS are configured globally (i.e. _before_
    cloning),the attack is foiled. As always,it is best to
    avoid cloning repositories from untrusted
    sources.(CVE-2021-21300)

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-2021-1870
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fb7a9c4f");
  script_set_attribute(attribute:"solution", value:
"Update the affected git package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-21300");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Git LFS Clone Command Exec');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"patch_publication_date", value:"2021/05/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/05/18");

  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-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:git-core-doc");
  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_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021-2024 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);

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

sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(8)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8");

uvp = get_kb_item("Host/EulerOS/uvp_version");
if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8", "EulerOS UVP " + uvp);

if (!get_kb_item("Host/EulerOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

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);

flag = 0;

pkgs = ["git-2.19.1-1.h9.eulerosv2r8",
        "git-core-2.19.1-1.h9.eulerosv2r8",
        "git-core-doc-2.19.1-1.h9.eulerosv2r8",
        "perl-Git-2.19.1-1.h9.eulerosv2r8"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"8", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "git");
}