Amazon Linux 2023 : gstreamer1-plugin-openh264, gstreamer1-plugins-bad-free, gstreamer1-plugins-bad-free-devel (ALAS2023-2026-1917)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2026-1917.
##

include('compat.inc');

if (description)
{
  script_id(327394);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/16");

  script_cve_id(
    "CVE-2026-52718",
    "CVE-2026-52719",
    "CVE-2026-52720",
    "CVE-2026-52721",
    "CVE-2026-52722",
    "CVE-2026-53702"
  );

  script_name(english:"Amazon Linux 2023 : gstreamer1-plugin-openh264, gstreamer1-plugins-bad-free, gstreamer1-plugins-bad-free-devel (ALAS2023-2026-1917)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2023 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1917 advisory.

    A denial of service vulnerability was found in GStreamer's AV1 codec parser in gst-plugins-bad. The
    gst_av1_parser_parse_tile_list_obu() function passes a byte count to a bit-reader API that expects a bit
    count, causing parser desynchronization. A remote attacker could trick a user into opening a specially
    crafted AV1 media file, triggering an assertion abort and causing the application to crash.
    (CVE-2026-52718)

    An out-of-bounds read vulnerability was found in the VA JPEG decoder in GStreamer's gst-plugins-bad. The
    JPEG parser reads a segment length value from the bitstream without validating it against available data.
    A remote attacker could trick a user into opening a specially crafted JPEG file, causing downstream
    parsing to read beyond the provided input buffer, leading to a crash or potential information disclosure.
    (CVE-2026-52719)

    A heap buffer overflow vulnerability was found in GStreamer's librfb (RFB/VNC client). The rectangle
    bounds check incorrectly validates area rather than individual dimensions, allowing a malicious VNC server
    to send a rectangle that extends beyond the framebuffer. A remote attacker could set up a malicious VNC
    server and trick a user into connecting, resulting in an out-of-bounds heap write that could lead to code
    execution or a crash. (CVE-2026-52720)

    Multiple out-of-bounds read vulnerabilities were found in GStreamer's pcapparse element. Malformed PCAP
    records can trigger reads beyond buffer boundaries during IPv4/TCP header parsing. This element is
    primarily used in debugging pipelines, limiting real-world exposure. A local attacker could trick a user
    into processing a specially crafted PCAP file, potentially leading to a crash or information disclosure.
    (CVE-2026-52721)

    A signed integer overflow vulnerability was found in GStreamer's VMnc decoder. A crafted VMnc stream with
    large cursor dimensions can overflow signed integer payload-size arithmetic, bypassing a length check and
    leading to out-of-bounds reads. A remote attacker could trick a user into opening a specially crafted VMnc
    file, potentially causing a crash or information disclosure. (CVE-2026-52722)

    A stack buffer overflow flaw was found in the GStreamer H.265 codec parser library (gst-plugins-bad). When
    parsing a buffering period SEI message, the parser uses an incorrect loop bound derived from
    cpb_cnt_minus1[i] (the loop index) instead of the sub-layer 0 CPB count cpb_cnt_minus1[0] from the
    referenced Sequence Parameter Set. A crafted H.265 video file or stream can cause the parser to write
    beyond the bounds of stack-allocated CPB delay arrays, resulting in a crash or potential stack memory
    corruption. (CVE-2026-53702)

Tenable has extracted the preceding description block directly from the tested product 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://alas.aws.amazon.com//AL2023/ALAS2023-2026-1917.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-52718.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-52719.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-52720.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-52721.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-52722.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-53702.html");
  script_set_attribute(attribute:"solution", value:
"Run 'dnf update gstreamer1-plugins-bad-free --releasever 2023.12.20260706' or
  or 'dnf update --advisory ALAS2023-2026-1917 --releasever 2023.12.20260706' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:N/C:P/I:N/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:R/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-2026-52721");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-52720");

  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:"2026/06/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:gstreamer1-plugin-openh264");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:gstreamer1-plugin-openh264-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:gstreamer1-plugins-bad-free");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:gstreamer1-plugins-bad-free-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:gstreamer1-plugins-bad-free-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:gstreamer1-plugins-bad-free-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:gstreamer1-plugins-bad-free-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:gstreamer1-plugins-bad-free-libs-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2023");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Amazon Linux 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_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");

  exit(0);
}

include("rpm2.inc");

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

var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "-2023")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2023", "Amazon Linux " + os_ver);
}

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

var pkgs = [
    {'reference':'gstreamer1-plugin-openh264-1.24.10-1.amzn2023.0.6', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugin-openh264-1.24.10-1.amzn2023.0.6', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugin-openh264-debuginfo-1.24.10-1.amzn2023.0.6', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugin-openh264-debuginfo-1.24.10-1.amzn2023.0.6', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugins-bad-free-1.24.10-1.amzn2023.0.6', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugins-bad-free-1.24.10-1.amzn2023.0.6', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugins-bad-free-debuginfo-1.24.10-1.amzn2023.0.6', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugins-bad-free-debuginfo-1.24.10-1.amzn2023.0.6', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugins-bad-free-debugsource-1.24.10-1.amzn2023.0.6', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugins-bad-free-debugsource-1.24.10-1.amzn2023.0.6', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugins-bad-free-devel-1.24.10-1.amzn2023.0.6', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugins-bad-free-devel-1.24.10-1.amzn2023.0.6', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugins-bad-free-libs-1.24.10-1.amzn2023.0.6', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugins-bad-free-libs-1.24.10-1.amzn2023.0.6', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugins-bad-free-libs-debuginfo-1.24.10-1.amzn2023.0.6', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gstreamer1-plugins-bad-free-libs-debuginfo-1.24.10-1.amzn2023.0.6', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var _release = NULL;
  var sp = NULL;
  var _cpu = NULL;
  var el_string = NULL;
  var rpm_spec_vers_cmp = NULL;
  var epoch = NULL;
  var allowmaj = NULL;
  var exists_check = NULL;
  var cves = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
    if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) 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, "gstreamer1-plugin-openh264 / gstreamer1-plugin-openh264-debuginfo / gstreamer1-plugins-bad-free / etc");
}