Amazon Linux 2023 : freerdp, freerdp-devel, freerdp-libs (ALAS2023-2026-2142)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2026-2142.
##

include('compat.inc');

if (description)
{
  script_id(345797);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/14");

  script_cve_id(
    "CVE-2026-63117",
    "CVE-2026-63633",
    "CVE-2026-63652",
    "CVE-2026-85089",
    "CVE-2026-85090"
  );

  script_name(english:"Amazon Linux 2023 : freerdp, freerdp-devel, freerdp-libs (ALAS2023-2026-2142)");

  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 ALAS2023-2026-2142 advisory.

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, an authenticated RDP
    client can advertise DVI ADPCM with nBlockAlign equal to 8 and nChannels equal to 2 to make the `bs`
    calculation in rdpsnd_server_select_format in channels/rdpsnd/server/rdpsnd_main.c equal zero. The
    subsequent out_frames modulo `bs` operation raises SIGFPE and terminates the server-side rdpsnd channel
    process. This vulnerability fixed in 3.28.0. (CVE-2026-63117)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, freerdp_dsp_decode_opus
    in libfreerdp/codec/dsp.c calls Stream_EnsureRemainingCapacity on context->common.buffer even though
    opus_decode writes decoded PCM into the caller-supplied out stream. A malicious RDP server that negotiates
    WAVE_FORMAT_OPUS with a client built with WITH_OPUS enabled and WITH_DSP_FFMPEG disabled can make libopus
    write a large decoded frame beyond the 4096-byte StreamPool_Take destination used by
    channels/rdpsnd/client/rdpsnd_main.c. This can corrupt the client heap, crash the client, and may permit
    code execution. This issue is fixed in version 3.28.0. (CVE-2026-63633)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0,
    rdpsnd_server_recv_formats in channels/rdpsnd/server/rdpsnd_main.c frees context->client_formats on a
    malformed Client Audio Formats PDU without clearing the owning pointer or num_client_formats. An
    authenticated RDP client can trigger an error such as a cbSize larger than the remaining record, leave the
    dangling pointer in the server context, and cause rdpsnd_server_context_free to free the same allocation
    again at session teardown. This reliably terminates the server and can create allocator-dependent heap
    corruption. This issue is fixed in version 3.28.0. (CVE-2026-63652)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.29.0,
    planar_decompress_plane_rle and planar_decompress_plane_rle_only in libfreerdp/codec/planar.c verify that
    a control byte exists but do not verify that the source buffer contains the zero to fifteen raw bytes
    declared by that control byte. A malicious RDP server can send a truncated planar bitmap or surface update
    whose final control byte claims additional raw bytes, causing the decoder to read beyond pSrcData while
    processing a color plane. This can crash the client and may disclose adjacent memory. This issue is fixed
    in version 3.29.0. (CVE-2026-69159)

    A flaw was found in FreeRDP. This vulnerability allows a remote attacker with low privileges to disclose
    sensitive information from the server or proxy process memory to a downstream client. This occurs because
    certain functions responsible for writing Save Session Info Protocol Data Units (PDUs) use Stream_Seek
    instead of Stream_Zero for reserved padding fields, leading to the transmission of uninitialized heap
    memory that may contain cleartext credentials from previous sessions. (CVE-2026-85089)

    A flaw was found in FreeRDP. A heap out-of-bounds read vulnerability exists in the
    `general_ChromaV1ToYUV444` function during AVC444 chroma plane reconstruction. A remote attacker, acting
    as a malicious Remote Desktop Protocol (RDP) server, can exploit this by sending a specially crafted
    `RFX_AVC444_BITMAP_STREAM` with specific frame geometry. This can lead to an out-of-bounds memory read,
    potentially disclosing sensitive heap data to the client or causing a client crash, resulting in a denial
    of service. (CVE-2026-85090)

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/ALAS2023-2026-2142.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-2026-63117.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-63633.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-63652.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-69159.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-85089.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-85090.html");
  script_set_attribute(attribute:"solution", value:
"Run 'dnf update freerdp --releasever 2023.12.20260914' or
  or 'dnf update --advisory ALAS2023-2026-2142 --releasever 2023.12.20260914' to update your system.");
  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:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/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:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-63633");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-85089");

  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:"2026/08/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freerdp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freerdp-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freerdp-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freerdp-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freerdp-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freerdp-libs-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freerdp-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:freerdp-server-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libwinpr");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libwinpr-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libwinpr-devel");
  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':'freerdp-3.31.0-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-3.31.0-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-debuginfo-3.31.0-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-debuginfo-3.31.0-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-debugsource-3.31.0-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-debugsource-3.31.0-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-devel-3.31.0-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-devel-3.31.0-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-libs-3.31.0-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-libs-3.31.0-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-libs-debuginfo-3.31.0-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-libs-debuginfo-3.31.0-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-server-3.31.0-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-server-3.31.0-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-server-debuginfo-3.31.0-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-server-debuginfo-3.31.0-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwinpr-3.31.0-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwinpr-3.31.0-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwinpr-debuginfo-3.31.0-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwinpr-debuginfo-3.31.0-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwinpr-devel-3.31.0-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwinpr-devel-3.31.0-1.amzn2023', '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_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, "freerdp / freerdp-debuginfo / freerdp-debugsource / etc");
}