Amazon Linux 2023 : cargo-c (ALAS2023-2026-2064)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2026-2064.
##

include('compat.inc');

if (description)
{
  script_id(337216);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/18");

  script_cve_id(
    "CVE-2026-53584",
    "CVE-2026-53585",
    "CVE-2026-53587",
    "CVE-2026-66032",
    "CVE-2026-66033",
    "CVE-2026-66034",
    "CVE-2026-66035"
  );

  script_name(english:"Amazon Linux 2023 : cargo-c (ALAS2023-2026-2064)");

  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 ALAS2023-2026-2064 advisory.

    libgit2 Submodule path traversal (CVE-2026-53584)

    Unbounded Memory Allocation via Delta Object Result-Size Header (CVE-2026-53585)

    libgit2 version 1.9.4 and below is vulnerable to a heap out-of-bounds read in set_data() in
    src/libgit2/transports/smart_pkt.c.

    The vulnerable code uses a fixed-size strncmp (smart_pkt.c:239) against the unvalidated capability buffer
    of a smart-protocol pkt-line. When the bytes following the pkt-line in the contiguous receive buffer
    happen to continue with ct-format=, the comparison spuriously matches, advancing format_str past the
    pkt-line boundary. The following memchr(format_str, ' ', len - (format_str - line)) (smart_pkt.c:246) then
    underflows its size_t size argument to ~SIZE_MAX and walks the heap looking for a space byte. An
    unauthenticated remote attacker who controls (or man-in-the-middles) a Git server reached over
    HTTP/HTTPS/SSH/git:// can trigger this on the FIRST ref-pkt of the refs advertisement, before any
    capability negotiation has taken place. The OOB walk causes a process crash (SIGSEGV) when memchr enters
    an unmapped page, and -- on heap layouts where memchr finds a stray space byte before crashing -- can
    additionally drive the git_error_set(...'%.*s', format_len, format_str) formatter to copy a large window
    of heap memory into the error string. (CVE-2026-53587)

    libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftp_open()
    function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client
    opening an SFTP session. When a server responds to SSH_FXP_OPEN with SSH_FXP_STATUS containing FX_OK, the
    response data buffer is freed, and if a subsequent sftp_packet_require() call returns a specific error
    such as LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED, the same pointer is freed a second time, enabling tcache
    dup conditions on glibc systems that allow overlapping allocations and function pointer overwrites.
    (CVE-2026-66032)

    libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underflow
    vulnerability in the ssh2_cipher_crypt() function in src/openssl.c that allows a malicious SSH server to
    crash any connecting client by negotiating AES-GCM ciphers during handshake. Attackers can exploit the
    underflow in the expression computing blocksize minus aadlen minus authentication tag length to trigger an
    out-of-bounds read and a memcpy call with a near-SIZE_MAX length argument, causing immediate process crash
    before any authentication occurs. (CVE-2026-66033)

    libssh2 through 1.11.1, fixed in commit a13bb6c, contains a missing bounds check vulnerability that allows
    a malicious SSH server to trigger an arbitrary-length heap out-of-bounds read and a free of an
    uninitialized pointer via the publickey subsystem. In libssh2_publickey_list_fetch(), the version 1
    response parser reads a server-controlled comment_len value and advances the parse pointer without
    verifying sufficient bytes remain in the buffer, causing the out-of-bounds read to leak heap pointers from
    adjacent allocations defeating ASLR, followed by heap allocator state corruption when the error cleanup
    path frees an uninitialized pointer from a non-zeroed realloc() region. (CVE-2026-66034)

    libssh2 through 1.11.1, fixed in commit 42e33d8, contains a pre-authentication heap buffer overflow
    vulnerability that allows a malicious SSH server to corrupt heap metadata in any connecting client by
    sending a packet with a packet_length smaller than the cipher's block size during Encrypt-then-MAC cipher
    negotiation. In the fullpacket() function in src/transport.c, the ETM path allocates a buffer of
    packet_length bytes but copies blocksize minus one bytes via memcpy, causing an overflow that on 32-bit
    glibc writes attacker-controlled bytes into an adjacent chunk's SIZE field, enabling tcache bin confusion,
    overlapping live objects, and function pointer overwrite during the session handshake before
    authentication. (CVE-2026-66035)

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/ALAS2023-2026-2064.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-2026-53584.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-53585.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-53587.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-66032.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-66033.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-66034.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-66035.html");
  script_set_attribute(attribute:"solution", value:
"Run 'dnf update rust-cargo-c --releasever 2023.12.20260817' or
  or 'dnf update --advisory ALAS2023-2026-2064 --releasever 2023.12.20260817' 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: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:"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:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-66032");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-66033");

  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:"2026/07/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:cargo-c");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:cargo-c-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rust-cargo-c-debugsource");
  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':'cargo-c-0.10.21-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'cargo-c-0.10.21-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'cargo-c-debuginfo-0.10.21-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'cargo-c-debuginfo-0.10.21-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rust-cargo-c-debugsource-0.10.21-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rust-cargo-c-debugsource-0.10.21-1.amzn2023.0.1', '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, "cargo-c / cargo-c-debuginfo / rust-cargo-c-debugsource");
}