Amazon Linux 2023 : libsoup3, libsoup3-devel (ALAS2023-2026-3144)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2026-3144.
##

include('compat.inc');

if (description)
{
  script_id(351071);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/29");

  script_cve_id(
    "CVE-2026-12478",
    "CVE-2026-12547",
    "CVE-2026-12548",
    "CVE-2026-12549",
    "CVE-2026-15712",
    "CVE-2026-15713",
    "CVE-2026-15714",
    "CVE-2026-66339",
    "CVE-2026-77014",
    "CVE-2026-77680",
    "CVE-2026-85197",
    "CVE-2026-85534"
  );
  script_xref(name:"IAVA", value:"2026-A-0555-S");
  script_xref(name:"IAVA", value:"2026-A-0894");

  script_name(english:"Amazon Linux 2023 : libsoup3, libsoup3-devel (ALAS2023-2026-3144)");

  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 ALAS2023-2026-3144 advisory.

    The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if
    (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can
    send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-
    based client when max_incoming_payload_size is set to 0. (CVE-2026-12478)

    SoupAuthManager caches proxy authentication credentials without scoping them to the proxy authority
    (host:port). When the proxy configuration changes (e.g., via system settings or WPAD), cached Proxy-
    Authorization headers from the previous proxy are sent to the new proxy, leaking credentials.
    (CVE-2026-12547)

    A heap out-of-bounds read flaw was found in libsoup. When parsing multipart HTTP messages, an integer type
    mismatch between the caller and soup_headers_parse() can cause the length parameter to be incorrectly
    truncated, leading to a heap buffer over-read. A remote attacker could use this flaw to crash an
    application using libsoup or potentially disclose heap memory contents. (CVE-2026-12548)

    The fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow
    checks with a general signed comparison. When a client sends a Range request with a suffix length
    exceeding the content size, the resulting negative start value is not properly clamped, leading to
    malformed HTTP 206 responses and log flooding. (CVE-2026-12549)

    A heap buffer over-read vulnerability was discovered in libsoup's HTTP/2 connection tracking framework.
    When the library processes an HTTP/2 GOAWAY frame, it improperly handles the Additional Debug Data
    payload by assuming the data stream is a safely NUL-terminated C-string. Because the parser lacks strict
    length-boundary verification before reading this data, a remote, unauthenticated attacker can
    intentionally send a malformed GOAWAY frame missing the appropriate null delimiter. This causes the
    library to read past the end of the allocated buffer, triggering an application crash that results in a
    denial of service (DoS), or potentially exposing fragments of memory contents. (CVE-2026-15712)

    A vulnerability was found in libsoup's HTTP/2 protocol implementation. The library fails to correctly
    release memory context blocks under specific stream termination conditions, such as when an HTTP/2
    connection encounters window exhaustion or explicit stream resets. A remote, unauthenticated attacker
    acting as a malicious network peer can trick the connection engine into allocating stream states that are
    subsequently leaked during cleanup. Over a sustained period, this flaw allows the remote attacker to
    consume the system's heap allocations incrementally, triggering a denial of service (DoS) through an
    ultimate Out-of-Memory (OOM) application crash. (CVE-2026-15713)

    An out-of-bounds read vulnerability was found in libsoup's multipart processing subsystem. The flaw exists
    in the soup_multipart_input_stream_read_headers() function inside soup-multipart-input-stream.c, which
    does not adequately restrict or validate the size of incoming multipart boundary strings. When processing
    a crafted HTTP response containing a malformed or oversized boundary parameter, the internal stream reader
    reads past the allocated buffer bounds. A remote, unauthenticated attacker can exploit this behavior to
    cause a service denial (DoS) through application failure or potentially read fragments of unauthorized
    memory metadata. (CVE-2026-15714)

    A flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup
    incorrectly attaches the Proxy-Authorization header to subsequent HTTPS requests sent through that tunnel
    to the destination server. This allows the destination server to capture proxy credentials, leading to
    information disclosure. (CVE-2026-66339)

    A flaw was found in libsoup's SoupServer HTTP Range header processing. The sort_ranges() comparator in
    soup-message-headers.c truncates a 64-bit subtraction result to 32-bit int, flipping the sign for range
    offsets differing by more than INT_MAX. This causes silent omission of requested byte ranges from HTTP 206
    Partial Content responses on resources larger than approximately 2 GB. (CVE-2026-77014)

    An algorithmic complexity flaw exists in libsoup's HTTP Range header processing that persists after the
    CVE-2025-32907 fix.

    CVE-2025-32907 addressed memory amplification when a client repeated the same range many times in a single
    Range header. Commit 9bb92f7a corrected merge correctness in soup_message_headers_get_ranges_internal() in
    libsoup/soup-message-headers.c, but the coalescing loop still removes merged ranges using
    g_array_remove_index() for each coalesced element. Because GArray is contiguous, each mid-array removal
    performs an O(N) memmove. When many identical satisfiable ranges are supplied (for example bytes=0-0
    repeated thousands of times), the loop performs O(N2) work coalescing them into a single range.

    The vulnerable path is reachable server-side from handle_partial_get() in libsoup/server/http1/soup-
    server-message-io-http1.c when a SoupServer handler returns HTTP 200 with a non-empty body. No
    authentication is required. The number of ranges is bounded only by the maximum request header size (~100
    KiB), allowing roughly 25,000 ranges per request. Reporter measurements on libsoup HEAD containing the
    CVE-2025-32907 fix show ~90 ms single-core CPU per such request at the wire maximum, blocking the server's
    event loop for that duration.

    This is a CPU exhaustion / availability issue only. No memory corruption or information disclosure occurs.

    Affected: libsoup versions containing the CVE-2025-32907 fix but not merge request !550.Fixed upstream: MR
    !550 merged 2026-08-20, replacing per-element removal with O(N) in-place compaction and rejecting Range
    headers requesting more than 200 ranges.Upstream report:
    https://gitlab.gnome.org/GNOME/libsoup/-/issues/538Related: CVE-2025-32907 (CVE-2026-77680)

    A flaw was found in libsoup. A malicious HTTP/2 server or a Man-in-the-Middle (MITM) attacker can exploit
    a heap use-after-free vulnerability in the HTTP/2 client implementation. This occurs when a GNOME
    application uploads a file using HTTP/2, and the server sends a GOAWAY frame while the file body is being
    read asynchronously. This can lead to memory corruption, potentially resulting in information disclosure
    or arbitrary code execution. (CVE-2026-85197)

    A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream,
    the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2
    server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client
    then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort
    the process or fail the HTTP/2 session. (CVE-2026-85534)

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/ALAS2023-2026-3144.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-2026-12478.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-12547.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-12548.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-12549.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-15712.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-15713.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-15714.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-66339.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-77014.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-77680.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-85197.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-85534.html");
  script_set_attribute(attribute:"solution", value:
"Run 'dnf update libsoup3 --releasever 2023.12.20260928' or
  or 'dnf update --advisory ALAS2023-2026-3144 --releasever 2023.12.20260928' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/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:R/S:U/C:L/I:L/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-2026-85197");

  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:"2026/06/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libsoup3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libsoup3-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libsoup3-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libsoup3-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libsoup3-doc");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2023");
  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("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':'libsoup3-3.7.2-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-3.7.2-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-debuginfo-3.7.2-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-debuginfo-3.7.2-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-debugsource-3.7.2-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-debugsource-3.7.2-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-devel-3.7.2-1.amzn2023', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-devel-3.7.2-1.amzn2023', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsoup3-doc-3.7.2-1.amzn2023', '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, "libsoup3 / libsoup3-debuginfo / libsoup3-debugsource / etc");
}