Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : libgit2 vulnerabilities (USN-8628-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8628-1. 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(365444);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/13");

  script_cve_id(
    "CVE-2016-10128",
    "CVE-2016-10129",
    "CVE-2018-8098",
    "CVE-2018-8099",
    "CVE-2018-15501",
    "CVE-2026-53584",
    "CVE-2026-53585",
    "CVE-2026-53586",
    "CVE-2026-53587"
  );
  script_xref(name:"USN", value:"8628-1");

  script_name(english:"Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : libgit2 vulnerabilities (USN-8628-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that
are affected by multiple vulnerabilities as referenced in the USN-8628-1 advisory.

    It was discovered that libgit2 incorrectly handled the Git Smart Protocol. A remote attacker could
    possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected
    Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-10128)

    It was discovered that libgit2 incorrectly handled empty packet lines in the Git Smart Protocol. A remote
    attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04
    LTS and Ubuntu 16.04 LTS. (CVE-2016-10129)

    It was discovered that libgit2 incorrectly handled error reporting in the HTTP transport. A remote
    attacker could possibly use this issue to spoof servers. This issue only affected Ubuntu 16.04 LTS.
    (CVE-2016-10130)

    It was discovered that libgit2 incorrectly handled certain crafted ng packets. A remote attacker could
    possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu
    16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2018-15501)

    Krishna Ram Prakash R and Vivek Parikh discovered that libgit2 incorrectly handled certain repository
    index files. A local attacker could possibly use this issue to cause a denial of service. This issue only
    affected Ubuntu 18.04 LTS. (CVE-2018-8098)

    Krishna Ram Prakash R and Vivek Parikh discovered that libgit2 incorrectly handled certain repository
    index files. A local attacker could possibly use this issue to cause a denial of service. This issue only
    affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2018-8099)

    Micha Majchrowicz and Marcin Wyczechowski discovered that libgit2 incorrectly handled submodule paths. A
    remote attacker could possibly use this issue to write files outside the working tree. This issue only
    affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-53584)

    Micha Majchrowicz and Marcin Wyczechowski discovered that libgit2 incorrectly handled delta object
    result-size headers. A remote attacker could possibly use this issue to cause libgit2 to consume excessive
    memory, leading to a denial of service. (CVE-2026-53585)

    Thai Son Dinh discovered that libgit2 incorrectly handled HTTP redirects. A remote attacker could possibly
    use this issue to leak credentials to an offsite redirect target. This issue only affected Ubuntu 20.04
    LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-53586)

    It was discovered that libgit2 incorrectly handled certain capability buffers in the smart protocol. A
    remote attacker could possibly use this issue to cause a denial of service. This issue only affected
    Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-53587)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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://ubuntu.com/security/notices/USN-8628-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  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:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-10128");

  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:"2017/01/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgit2-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgit2-1.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgit2-1.7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgit2-1.9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgit2-26");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgit2-28");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgit2-fixtures");
  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) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.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 (! ('14.04' >< os_release || '18.04' >< os_release || '20.04' >< os_release || '22.04' >< os_release || '24.04' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 18.04 / 20.04 / 22.04 / 24.04 / 26.04', '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': '14.04', 'pkgname': 'libgit2-0', 'pkgver': '0.19.0-2ubuntu0.4+esm2', 'cves': ['CVE-2016-10128', 'CVE-2016-10129', 'CVE-2018-8099', 'CVE-2018-15501', 'CVE-2026-53585']},
    {'osver': '18.04', 'pkgname': 'libgit2-26', 'pkgver': '0.26.0+dfsg.1-1.1ubuntu0.2+esm2', 'cves': ['CVE-2018-8098', 'CVE-2018-8099', 'CVE-2018-15501', 'CVE-2026-53585']},
    {'osver': '20.04', 'pkgname': 'libgit2-28', 'pkgver': '0.28.4+dfsg.1-2ubuntu0.1+esm1', 'cves': ['CVE-2026-53584', 'CVE-2026-53585', 'CVE-2026-53586']},
    {'osver': '22.04', 'pkgname': 'libgit2-1.1', 'pkgver': '1.1.0+dfsg.1-4.1ubuntu0.1+esm1', 'cves': ['CVE-2026-53584', 'CVE-2026-53585', 'CVE-2026-53586']},
    {'osver': '22.04', 'pkgname': 'libgit2-fixtures', 'pkgver': '1.1.0+dfsg.1-4.1ubuntu0.1+esm1', 'cves': ['CVE-2026-53584', 'CVE-2026-53585', 'CVE-2026-53586']},
    {'osver': '24.04', 'pkgname': 'libgit2-1.7', 'pkgver': '1.7.2+ds-1ubuntu3.1', 'cves': ['CVE-2026-53584', 'CVE-2026-53585', 'CVE-2026-53586', 'CVE-2026-53587']},
    {'osver': '24.04', 'pkgname': 'libgit2-fixtures', 'pkgver': '1.7.2+ds-1ubuntu3.1', 'cves': ['CVE-2026-53584', 'CVE-2026-53585', 'CVE-2026-53586', 'CVE-2026-53587']},
    {'osver': '26.04', 'pkgname': 'libgit2-1.9', 'pkgver': '1.9.1+ds-1ubuntu1.1', 'cves': ['CVE-2026-53584', 'CVE-2026-53585', 'CVE-2026-53586', 'CVE-2026-53587']},
    {'osver': '26.04', 'pkgname': 'libgit2-fixtures', 'pkgver': '1.9.1+ds-1ubuntu1.1', 'cves': ['CVE-2026-53584', 'CVE-2026-53585', 'CVE-2026-53586', 'CVE-2026-53587']}
];

var flag = 0;
foreach var 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 (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libgit2-0 / libgit2-1.1 / libgit2-1.7 / libgit2-1.9 / libgit2-26 / etc');
}