EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2272)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(152313);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/06");

  script_cve_id(
    "CVE-2020-25220",
    "CVE-2020-25670",
    "CVE-2020-25671",
    "CVE-2020-25672",
    "CVE-2020-36311",
    "CVE-2020-36312",
    "CVE-2021-23134",
    "CVE-2021-28950",
    "CVE-2021-29155",
    "CVE-2021-31829",
    "CVE-2021-31916",
    "CVE-2021-32399",
    "CVE-2021-33033",
    "CVE-2021-33034",
    "CVE-2021-33200",
    "CVE-2021-3444",
    "CVE-2021-3506"
  );

  script_name(english:"EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2272)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the kernel packages installed, the
EulerOS installation on the remote host is affected by the following
vulnerabilities :

  - The kernel package contains the Linux kernel (vmlinuz),
    the core of any Linux operating system. The kernel
    handles the basic functions of the operating system:
    memory allocation, process allocation, device input and
    output, etc.Security Fix(es):kernel/bpf/verifier.c in
    the Linux kernel through 5.12.7 enforces incorrect
    limits for pointer arithmetic operations, aka
    CID-bb01a1bba579. This can be abused to perform
    out-of-bounds reads and writes in kernel memory,
    leading to local privilege escalation to root. In
    particular, there is a corner case where the off reg
    causes a masking direction change, which then results
    in an incorrect final aux->alu_limit.(CVE-2021-33200)A
    vulnerability was found in Linux Kernel where refcount
    leak in llcp_sock_bind() causing use-after-free which
    might lead to privilege escalations.(CVE-2020-25670)A
    vulnerability was found in Linux Kernel, where a
    refcount leak in llcp_sock_connect() causing
    use-after-free which might lead to privilege
    escalations.(CVE-2020-25671)A memory leak vulnerability
    was found in Linux kernel in
    llcp_sock_connect(CVE-2020-25672)An out-of-bounds (OOB)
    memory access flaw was found in fs/f2fs/ Node.c in the
    f2fs module in the Linux kernel in versions before
    5.12.0-rc4. A bounds check failure allows a local
    attacker to gain access to out-of-bounds memory leading
    to a system crash or a leak of internal kernel
    information. The highest threat from this vulnerability
    is to system availability.(CVE-2021-3506)The Linux
    kernel 4.9.x before 4.9.233, 4.14.x before 4.14.194,
    and 4.19.x before 4.19.140 has a use-after-free because
    skcd->no_refcnt was not considered during a backport of
    a CVE-2020-14356 patch. This is related to the cgroups
    feature.(CVE-2020-25220)The Linux kernel before 5.11.14
    has a use-after-free in cipso_v4_genopt in
    net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO
    refcounting for the DOI definitions is mishandled, aka
    CID-ad5d07f4a9cd. This leads to writing an arbitrary
    value.(CVE-2021-33033)kernel/bpf/verifier.c in the
    Linux kernel through 5.12.1 performs undesirable
    speculative loads, leading to disclosure of stack
    content via side-channel attacks, aka CID-801c6058d14a.
    The specific concern is not protecting the BPF stack
    area against speculative loads. Also, the BPF stack can
    contain uninitialized data that might represent
    sensitive information previously operated on by the
    kernel.(CVE-2021-31829)An issue was discovered in
    fs/fuse/fuse_i.h in the Linux kernel before 5.11.8.
    A(CVE-2021-28950)net/bluetooth/hci_request.c in the
    Linux kernel through 5.12.2 has a race condition for
    removal of the HCI controller.(CVE-2021-32399)In the
    Linux kernel before 5.12.4, net/bluetooth/hci_event.c
    has a use-after-free when destroying an hci_chan, aka
    CID-5c4c8c954409. This leads to writing an arbitrary
    value.(CVE-2021-33034)An out-of-bounds (OOB) memory
    write flaw was found in list_devices in
    drivers/md/dm-ioctl.c in the Multi-device driver module
    in the Linux kernel before 5.12. A bound check failure
    allows an attacker with special user (CAP_SYS_ADMIN)
    privilege to gain access to out-of-bounds memory
    leading to a system crash or a leak of internal kernel
    information. The highest threat from this vulnerability
    is to system availability.(CVE-2021-31916)Use After
    Free vulnerability in nfc sockets in the Linux Kernel
    before 5.12.4 allows local attackers to elevate their
    privileges. In typical configurations, the issue can
    only be triggered by a privileged local user with the
    CAP_NET_RAW capability.(CVE-2021-23134)An issue was
    discovered in the Linux kernel before 5.9.
    arch/x86/kvm/svm/sev.c allows attackers to cause a
    denial of service (soft lockup) by triggering
    destruction of a large SEV VM (which requires
    unregistering many encrypted regions), aka
    CID-7be74942f184.(CVE-2020-36311)An issue was
    discovered in the Linux kernel before 5.8.10.
    virt/kvm/kvm_main.c has a kvm_io_bus_unregister_dev
    memory leak upon a kmalloc failure, aka
    CID-f65886606c2d.(CVE-2020-36312)The bpf verifier in
    the Linux kernel did not properly handle mod32
    destination register truncation when the source
    register was known to be 0. A local attacker with the
    ability to load bpf programs could use this gain
    out-of-bounds reads in kernel memory leading to
    information disclosure (kernel memory), and possibly
    out-of-bounds writes that could potentially lead to
    code execution. This issue was addressed in the
    upstream kernel in commit 9b00f1b78809 ('bpf: Fix
    truncation handling for mod32 dst reg wrt zero') and in
    Linux stable kernels 5.11.2, 5.10.19, and
    5.4.101.(CVE-2021-3444)An issue was discovered in the
    Linux kernel through 5.11.x. kernel/bpf/verifier.c
    performs undesirable out-of-bounds speculation on
    pointer arithmetic, leading to side-channel attacks
    that defeat Spectre mitigations and obtain sensitive
    information from kernel memory. Specifically, for
    sequences of pointer arithmetic operations, the pointer
    modification performed by the first operation is not
    correctly accounted for when restricting subsequent
    operations.(CVE-2021-29155)

Note that Tenable Network Security has extracted the preceding
description block directly from the EulerOS security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2021-2272
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0abdb7aa");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel packages.");
  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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-33200");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-3444");

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

  script_set_attribute(attribute:"patch_publication_date", value:"2021/08/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/08/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:kernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:kernel-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:kernel-tools-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:python3-perf");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Huawei Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
  script_exclude_keys("Host/EulerOS/uvp_version");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

release = get_kb_item("Host/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
if (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0");

sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(9)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP9");

uvp = get_kb_item("Host/EulerOS/uvp_version");
if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP9", "EulerOS UVP " + uvp);

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

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("aarch64" >!< cpu) audit(AUDIT_ARCH_NOT, "aarch64", cpu);

flag = 0;

pkgs = ["kernel-4.19.90-vhulk2103.1.0.h487.eulerosv2r9",
        "kernel-tools-4.19.90-vhulk2103.1.0.h487.eulerosv2r9",
        "kernel-tools-libs-4.19.90-vhulk2103.1.0.h487.eulerosv2r9",
        "python3-perf-4.19.90-vhulk2103.1.0.h487.eulerosv2r9"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"9", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "kernel");
}