Amazon Linux AMI : kernel (ALAS-2022-1636)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2022-1636.
##

include('compat.inc');

if (description)
{
  script_id(165986);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/10");

  script_cve_id(
    "CVE-2021-4159",
    "CVE-2021-33655",
    "CVE-2022-1462",
    "CVE-2022-1679",
    "CVE-2022-2153",
    "CVE-2022-2588",
    "CVE-2022-2663",
    "CVE-2022-28693",
    "CVE-2022-29901",
    "CVE-2022-3028",
    "CVE-2022-36123",
    "CVE-2022-36879",
    "CVE-2022-36946",
    "CVE-2022-39188",
    "CVE-2022-40307",
    "CVE-2022-48687",
    "CVE-2023-2860"
  );

  script_name(english:"Amazon Linux AMI : kernel (ALAS-2022-1636)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux AMI host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of kernel installed on the remote host is prior to 4.14.294-150.533. It is, therefore, affected by multiple
vulnerabilities as referenced in the ALAS-2022-1636 advisory.

    2024-06-07: CVE-2022-48687 was added to this advisory.

    2024-01-31: CVE-2022-28693 was added to this advisory.

    2024-01-31: CVE-2022-29901 was added to this advisory.

    2024-01-31: CVE-2023-2860 was added to this advisory.

    2024-01-31: CVE-2022-39188 was added to this advisory.

    An out-of-bounds write flaw was found in the Linux kernel's framebuffer-based console driver
    functionality in the way a user triggers ioctl FBIOPUT_VSCREENINFO with malicious data. This flaw allows a
    local user to crash or potentially escalate their privileges on the system. (CVE-2021-33655)

    A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures.
    Internal memory locations could be returned to userspace.  A local attacker with the permissions to insert
    eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit
    mitigations in place for the kernel. (CVE-2021-4159)

    An out-of-bounds read flaw was found in the Linux kernel's TeleTYpe subsystem. The issue occurs in how a
    user triggers a race condition using ioctls TIOCSPTLCK and TIOCGPTPEER and TIOCSTI and TCXONC with leakage
    of memory in the flush_to_ldisc function. This flaw allows a local user to crash the system or read
    unauthorized random data from memory. (CVE-2022-1462)

    A use-after-free flaw was found in the Linux kernel's Atheros wireless adapter driver in the way a user
    forces the ath9k_htc_wait_for_target function to fail with some input messages. This flaw allows a local
    user to crash or potentially escalate their privileges on the system. (CVE-2022-1679)

    A flaw was found in the Linux kernel's KVM when attempting to set a SynIC IRQ. This issue makes it
    possible for a misbehaving VMM to write to SYNIC/STIMER MSRs, causing a NULL pointer dereference. This
    flaw allows an unprivileged local attacker on the host to issue specific ioctl calls, causing a kernel
    oops condition that results in a denial of service. (CVE-2022-2153)

    A use-after-free flaw was found in route4_change in the net/sched/cls_route.c filter implementation in the
    Linux kernel. This flaw allows a local user to crash the system and possibly lead to a local privilege
    escalation problem. (CVE-2022-2588)

    An issue was found in the Linux kernel in nf_conntrack_irc where the message handling can be confused and
    incorrectly matches the message. A firewall may be able to be bypassed when users are using unencrypted
    IRC with nf_conntrack_irc configured. (CVE-2022-2663)

    A flaw was found in hw. The unprotected alternative channel of return branch target prediction in some
    Intel(R) Processors may allow an authorized user to enable information disclosure via local access.
    (CVE-2022-28693)

    Intel microprocessor generations 6 to 8 are affected by a new Spectre variant that is able to bypass their
    retpoline mitigation in the kernel to leak arbitrary data. An attacker with unprivileged user access can
    hijack return instructions to achieve arbitrary speculative code execution under certain
    microarchitecture-dependent conditions. (CVE-2022-29901)

    A race condition was found in the Linux kernel's IP framework for transforming packets (XFRM subsystem)
    when multiple calls to xfrm_probe_algs occurred simultaneously. This flaw could allow a local attacker to
    potentially trigger an out-of-bounds write or leak kernel heap memory by performing an out-of-bounds read
    and copying it into a socket. (CVE-2022-3028)

    A memory access flaw was found in the Linux kernel's XEN hypervisor for the virtual machine. This flaw
    allows a local user to crash the system or potentially escalate their privileges on the system.
    (CVE-2022-36123)

    An issue was discovered in the Linux kernel through 5.18.14. xfrm_expand_policies in
    net/xfrm/xfrm_policy.c can cause a refcount to be dropped twice. (CVE-2022-36879)

    A memory corruption flaw was found in the Linux kernel's Netfilter subsystem in the way a local user uses
    the libnetfilter_queue when analyzing a corrupted network packet. This flaw allows a local user to crash
    the system or a remote user to crash the system when the libnetfilter_queue is used by a local user.
    (CVE-2022-36946)

    An issue was discovered in include/asm-generic/tlb.h in the Linux kernel before 5.19. Because of a race
    condition (unmap_mapping_range versus munmap), a device driver can free a page while it still has stale
    TLB entries. This only occurs in situations with VM_PFNMAP VMAs. (CVE-2022-39188)

    A race condition in the Linux kernel's EFI capsule loader driver was found in the way it handled write and
    flush operations on the device node of the EFI capsule. A local user could potentially use this flaw to
    crash the system. (CVE-2022-40307)

    In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: fix out-of-bounds read when
    setting HMAC data. The SRv6 layer allows defining HMAC data that can later be used to sign IPv6 Segment
    Routing Headers. This configuration is realised via netlink through four attributes: SEG6_ATTR_HMACKEYID,
    SEG6_ATTR_SECRET, SEG6_ATTR_SECRETLEN and SEG6_ATTR_ALGID. (CVE-2022-48687)

    The upstream advisory describes this issue as follows:

    This vulnerability allows local attackers to disclose sensitive information on affected installations of
    the Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target
    system in order to exploit this vulnerability.

    The specific flaw exists within the processing of seg6 attributes. The issue results from the lack of
    proper validation of user-supplied data, which can result in a read past the end of an allocated buffer.
    An attacker can leverage this in conjunction with other vulnerabilties to escalate privileges and execute
    arbitrary code in the context of the kernel. (CVE-2023-2860)

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/ALAS-2022-1636.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-4159.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-33655.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-1462.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-1679.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-2153.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-2588.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-2663.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-28693.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-29901.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-3028.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-36123.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-36879.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-36946.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-39188.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-40307.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2022-48687.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2023-2860.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update kernel' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-1679");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2022-36123");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/05/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/09/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/10/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-i686");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perf-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
  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) 2022-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("kpatch.nasl", "ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");

  exit(0);
}

include("rpm.inc");
include("hotfixes.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 != "A")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}

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

if (get_one_kb_item("Host/kpatch/kernel-cves"))
{
  set_hotfix_type("kpatch");
  var cve_list = make_list("CVE-2021-4159", "CVE-2021-33655", "CVE-2022-1462", "CVE-2022-1679", "CVE-2022-2153", "CVE-2022-2588", "CVE-2022-2663", "CVE-2022-3028", "CVE-2022-28693", "CVE-2022-29901", "CVE-2022-36123", "CVE-2022-36879", "CVE-2022-36946", "CVE-2022-39188", "CVE-2022-40307", "CVE-2022-48687", "CVE-2023-2860");
  if (hotfix_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, "kpatch hotfix for ALAS-2022-1636");
  }
  else
  {
    __rpm_report = hotfix_reporting_text();
  }
}
var pkgs = [
    {'reference':'kernel-4.14.294-150.533.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-4.14.294-150.533.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-debuginfo-4.14.294-150.533.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-debuginfo-4.14.294-150.533.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-debuginfo-common-i686-4.14.294-150.533.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-debuginfo-common-x86_64-4.14.294-150.533.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-devel-4.14.294-150.533.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-devel-4.14.294-150.533.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-headers-4.14.294-150.533.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-headers-4.14.294-150.533.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-tools-4.14.294-150.533.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-tools-4.14.294-150.533.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-tools-debuginfo-4.14.294-150.533.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-tools-debuginfo-4.14.294-150.533.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-tools-devel-4.14.294-150.533.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-tools-devel-4.14.294-150.533.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'perf-4.14.294-150.533.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'perf-4.14.294-150.533.amzn1', 'cpu':'x86_64', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'perf-debuginfo-4.14.294-150.533.amzn1', 'cpu':'i686', 'release':'ALA', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'perf-debuginfo-4.14.294-150.533.amzn1', 'cpu':'x86_64', 'release':'ALA', '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;
  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 (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)) 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, "kernel / kernel-debuginfo / kernel-debuginfo-common-x86_64 / etc");
}