Amazon Linux 2 : freerdp, --advisory ALAS2-2026-3162 (ALAS-2026-3162)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2026-3162.
##

include('compat.inc');

if (description)
{
  script_id(299517);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/30");

  script_cve_id(
    "CVE-2026-23530",
    "CVE-2026-23531",
    "CVE-2026-23532",
    "CVE-2026-23533",
    "CVE-2026-23534",
    "CVE-2026-23883",
    "CVE-2026-23884"
  );
  script_xref(name:"IAVA", value:"2026-A-0099-S");

  script_name(english:"Amazon Linux 2 : freerdp, --advisory ALAS2-2026-3162 (ALAS-2026-3162)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of freerdp installed on the remote host is prior to 2.11.7-1. It is, therefore, affected by multiple
vulnerabilities as referenced in the ALAS2-2026-3162 advisory.

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version
    3.21.0,`freerdp_bitmap_decompress_planar` does not validate `nSrcWidth`/`nSrcHeight` against
    `planar->maxWidth`/`maxHeight` before RLE decode. A malicious server can trigger a client-side heap buffer
    overflow, causing a crash (DoS) and potential heap corruption with code-execution risk depending on
    allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.
    (CVE-2026-23530)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, in ClearCodec,
    when `glyphData` is present, `clear_decompress` calls `freerdp_image_copy_no_overlap` without validating
    the destination rectangle, allowing an out-of-bounds read/write via crafted RDPGFX surface updates. A
    malicious server can trigger a client-side heap buffer overflow, causing a crash (DoS) and potential heap
    corruption with code-execution risk depending on allocator behavior and surrounding heap layout. Version
    3.21.0 contains a patch for the issue. (CVE-2026-23531)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side
    heap buffer overflow occurs in the  FreeRDP client's `gdi_SurfaceToSurface` path due to a mismatch between
    destination rectangle clamping and the actual copy size. A malicious server can trigger a client-side heap
    buffer overflow, causing a crash (DoS) and potential heap corruption with code-execution risk depending on
    allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.
    (CVE-2026-23532)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side
    heap buffer overflow occurs in the RDPGFX ClearCodec decode path when maliciously crafted residual data
    causes out-of-bounds writes during color output. A malicious server can trigger a client-side heap buffer
    overflow, causing a crash (DoS) and potential heap corruption with code-execution risk depending on
    allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.
    (CVE-2026-23533)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side
    heap buffer overflow occurs in the ClearCodec bands decode path when crafted band coordinates allow writes
    past the end of the destination surface buffer. A malicious server can trigger a client-side heap buffer
    overflow, causing a crash (DoS) and potential heap corruption with code-execution risk depending on
    allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.
    (CVE-2026-23534)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, `xf_Pointer_New`
    frees `cursorPixels` on failure, then `pointer_free` calls `xf_Pointer_Free` and frees it again,
    triggering ASan UAF. A malicious server can trigger a client-side use after free, causing a crash (DoS)
    and potential heap corruption with code-execution risk depending on allocator behavior and surrounding
    heap layout. Version 3.21.0 contains a patch for the issue. (CVE-2026-23883)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, offscreen bitmap
    deletion leaves `gdi->drawing` pointing to freed memory, causing UAF when related update packets arrive. A
    malicious server can trigger a client-side use after free, causing a crash (DoS) and potential heap
    corruption with code-execution risk depending on allocator behavior and surrounding heap layout. Version
    3.21.0 contains a patch for the issue. (CVE-2026-23884)

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//AL2/ALAS2-2026-3162.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-2026-23530.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-23531.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-23532.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-23533.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-23534.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-23883.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-23884.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update freerdp' or
  or 'yum update --advisory ALAS2-2026-3162' 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: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:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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-2026-23884");

  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:"2026/01/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/02/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/19");

  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-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:libwinpr");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libwinpr-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  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("rpm.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 != "2")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}

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

var pkgs = [
    {'reference':'freerdp-2.11.7-1.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-2.11.7-1.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-2.11.7-1.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-debuginfo-2.11.7-1.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-debuginfo-2.11.7-1.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-debuginfo-2.11.7-1.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-devel-2.11.7-1.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-devel-2.11.7-1.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-devel-2.11.7-1.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-libs-2.11.7-1.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-libs-2.11.7-1.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'freerdp-libs-2.11.7-1.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwinpr-2.11.7-1.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwinpr-2.11.7-1.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwinpr-2.11.7-1.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwinpr-devel-2.11.7-1.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwinpr-devel-2.11.7-1.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwinpr-devel-2.11.7-1.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', '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-devel / etc");
}