EulerOS 2.0 SP13 : libtiff (EulerOS-SA-2026-4066)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(364726);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/12");

  script_cve_id(
    "CVE-2026-12912",
    "CVE-2026-36849",
    "CVE-2026-52490",
    "CVE-2026-52491",
    "CVE-2026-52492"
  );

  script_name(english:"EulerOS 2.0 SP13 : libtiff (EulerOS-SA-2026-4066)");

  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 libtiff packages installed, the EulerOS installation on the remote host is affected by
the following vulnerabilities :

    A flaw was found in libtiff. A remote attacker could exploit this vulnerability by providing a specially
    crafted PixarLog-compressed TIFF image. This issue occurs when decoding Pixarlog codec images with the
    PIXARLOGDATAFMT_8BITABGR output format and a specific stride value, leading to a heap-based buffer
    overflow. This could potentially result in arbitrary code execution or a denial of service
    (DoS).(CVE-2026-12912)

    An integer overflow in the libtiff rgb2ycbcr utility's cvtRaster() function when computing strip buffer
    sizes can result in an undersized heap allocation and subsequent heap-based buffer overflow during YCbCr
    conversion of a crafted TIFF image(CVE-2026-52492)

    An issue in libtiff 85f2ac8e0b01cb7db2bbecf4a3b891bdbef67938 allows an attacker to execute arbitrary code
    via the process_command_opts() function in tools/tiffcrop.c(CVE-2026-52490)

    An issue in libtiff 85f2ac8e0b01cb7db2bbecf4a3b891bdbef67938 allows an attacker to execute arbitrary code
    via the libtiff/tools/thumbnail.c: main() component(CVE-2026-52491)

    ['Hi,\n\nI would like to disclose CVE-2026-36849, a denial of service vulnerability\nin libtiff.\n\n==
    Summary ==\n\nAn issue in libtiff v4.7.1 allows an attacker to cause a denial of service\nvia a crafted
    TIFF file containing a large SamplesPerPixel tag value.\n\n== Affected Versions ==\n\nlibtiff v4.7.1 and
    prior\n\n== Patch ==', '== References ==\n\n- CVE: CVE-2026-36849\n- Issue:', 'Regards,\nSatriyo
    Utomo\n(aleens-lab)'](CVE-2026-36849)

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

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2026-4066
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9a89918e");
  script_set_attribute(attribute:"solution", value:
"Update the affected libtiff packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-52490");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libtiff");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libtiff-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libtiff-help");
  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) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
  script_exclude_keys("Host/EulerOS/uvp_version");

  exit(0);
}

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 SP13");

var sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(13)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP13");

if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP13", "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$" && "aarch64" >!< cpu && "x86" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "x86" >!< cpu) audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

var flag = 0;

var pkgs = [
  "libtiff-4.3.0-36.h17.eulerosv2r13",
  "libtiff-devel-4.3.0-36.h17.eulerosv2r13",
  "libtiff-help-4.3.0-36.h17.eulerosv2r13"
];

foreach (var pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"13", reference:pkg)) flag++;

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