EulerOS 2.0 SP8 : kernel (EulerOS-SA-2021-1983)

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

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

if (description)
{
  script_id(151042);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/12");

  script_cve_id(
    "CVE-2020-27170",
    "CVE-2020-27171",
    "CVE-2020-35519",
    "CVE-2020-36311",
    "CVE-2020-36312",
    "CVE-2020-36322",
    "CVE-2021-23133",
    "CVE-2021-27365",
    "CVE-2021-28688",
    "CVE-2021-28964",
    "CVE-2021-28972",
    "CVE-2021-29154",
    "CVE-2021-29264",
    "CVE-2021-29265",
    "CVE-2021-29647",
    "CVE-2021-30002",
    "CVE-2021-3483"
  );

  script_name(english:"EulerOS 2.0 SP8 : kernel (EulerOS-SA-2021-1983)");

  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 :

  - An issue was discovered in the Linux kernel before
    5.11.7. usbip_sockfd_store in
    drivers/usb/usbip/stub_dev.c allows attackers to cause
    a denial of service (GPF) because the stub-up sequence
    has race conditions during an update of the local and
    shared status, aka CID-9380afd6df70.(CVE-2021-29265)

  - A race condition was discovered in get_old_root in
    fs/btrfs/ctree.c in the Linux kernel through 5.11.8. It
    allows attackers to cause a denial of service (BUG)
    because of a lack of locking on an extent buffer before
    a cloning operation, aka
    CID-dbcc7d57bffc.(CVE-2021-28964)

  - In drivers/pci/hotplug/rpadlpar_sysfs.c in the Linux
    kernel through 5.11.8, the RPA PCI Hotplug driver has a
    user-tolerable buffer overflow when writing a new
    device name to the driver from userspace, allowing
    userspace to write data to the kernel stack frame
    directly. This occurs because add_slot_store and
    remove_slot_store mishandle drc_name '\0' termination,
    aka CID-cc7a0bb058b8.(CVE-2021-28972)

  - 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)

  - 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)

  - BPF JIT compilers in the Linux kernel through 5.11.12
    have incorrect computation of branch displacements,
    allowing them to execute arbitrary code within the
    kernel context. This affects
    arch/x86/net/bpf_jit_comp.c and
    arch/x86/net/bpf_jit_comp32.c.(CVE-2021-29154)

  - An issue was discovered in the Linux kernel before
    5.11.8. 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, aka CID-f232326f6966. This affects
    pointer types that do not define a
    ptr_limit.(CVE-2020-27170)

  - An issue was discovered in the Linux kernel before
    5.11.8. kernel/bpf/verifier.c has an off-by-one error
    (with a resultant integer underflow) affecting
    out-of-bounds speculation on pointer arithmetic,
    leading to side-channel attacks that defeat Spectre
    mitigations and obtain sensitive information from
    kernel memory, aka CID-10d2bb2e6b1d.(CVE-2020-27171)

  - An out-of-bounds (OOB) memory access flaw was found in
    x25_bind in net/x25/af_x25.c in the Linux kernel
    version v5.12-rc5. A bounds check failure allows a
    local attacker with a user account on the system 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
    confidentiality, integrity, as well as system
    availability.(CVE-2020-35519)

  - An issue was discovered in the Linux kernel through
    5.11.10. drivers/net/ethernet/freescale/gianfar.c in
    the Freescale Gianfar Ethernet driver allows attackers
    to cause a system crash because a negative fragment
    size is calculated in situations involving an rx queue
    overrun when jumbo packets are used and NAPI is
    enabled, aka CID-d8861bab48b6.(CVE-2021-29264)

  - An issue was discovered in the Linux kernel before
    5.11.11. qrtr_recvmsg in net/qrtr/qrtr.c allows
    attackers to obtain sensitive information from kernel
    memory because of a partially uninitialized data
    structure, aka CID-50535249f624.(CVE-2021-29647)

  - An issue was discovered in the FUSE filesystem
    implementation in the Linux kernel before 5.10.6, aka
    CID-5d069dbe8aaf. fuse_do_getattr() calls
    make_bad_inode() in inappropriate situations, causing a
    system crash. NOTE: the original fix for this
    vulnerability was incomplete, and its incompleteness is
    tracked as CVE-2021-28950.(CVE-2020-36322)

  - An issue was discovered in the Linux kernel through
    5.11.3. Certain iSCSI data structures do not have
    appropriate length constraints or checks, and can
    exceed the PAGE_SIZE value. An unprivileged user can
    send a Netlink message that is associated with iSCSI,
    and has a length up to the maximum length of a Netlink
    message.(CVE-2021-27365)

  - A flaw was found in the Nosy driver in the Linux
    kernel. This issue allows a device to be inserted twice
    into a doubly-linked list, leading to a use-after-free
    when one of these devices is removed. The highest
    threat from this vulnerability is to confidentiality,
    integrity, as well as system availability. Versions
    before kernel 5.12-rc6 are affected(CVE-2021-3483)

  - An issue was discovered in the Linux kernel before
    5.11.3 when a webcam device exists. video_usercopy in
    drivers/media/v4l2-core/v4l2-ioctl.c has a memory leak
    for large arguments, aka
    CID-fb18802a338b.(CVE-2021-30002)

  - The fix for XSA-365 includes initialization of pointers
    such that subsequent cleanup code wouldn't use
    uninitialized or stale values. This initialization went
    too far and may under certain conditions also overwrite
    pointers which are in need of cleaning up. The lack of
    cleanup would result in leaking persistent grants. The
    leak in turn would prevent fully cleaning up after a
    respective guest has died, leaving around zombie
    domains. All Linux versions having the fix for XSA-365
    applied are vulnerable. XSA-365 was classified to
    affect versions back to at least 3.11.(CVE-2021-28688)

  - A race condition in Linux kernel SCTP sockets
    (net/sctp/socket.c) before 5.12-rc8 can lead to kernel
    privilege escalation from the context of a network
    service or an unprivileged process. If
    sctp_destroy_sock is called without
    sock_net(sk)->sctp.addr_wq_lock then an element is
    removed from the auto_asconf_splist list without any
    proper locking. This can be exploited by an attacker
    with network service privileges to escalate to root or
    from the context of an unprivileged user directly if a
    BPF_CGROUP_INET_SOCK_CREATE is attached which denies
    creation of some SCTP socket.(CVE-2021-23133)

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-2021-1983
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e06d7501");
  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-2021-29154");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-3483");

  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:"2021/06/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/06/28");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:bpftool");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:kernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:kernel-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:kernel-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:kernel-source");
  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:perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:python-perf");
  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 !~ "^(8)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8");

uvp = get_kb_item("Host/EulerOS/uvp_version");
if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8", "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 = ["bpftool-4.19.36-vhulk1907.1.0.h1032.eulerosv2r8",
        "kernel-4.19.36-vhulk1907.1.0.h1032.eulerosv2r8",
        "kernel-devel-4.19.36-vhulk1907.1.0.h1032.eulerosv2r8",
        "kernel-headers-4.19.36-vhulk1907.1.0.h1032.eulerosv2r8",
        "kernel-source-4.19.36-vhulk1907.1.0.h1032.eulerosv2r8",
        "kernel-tools-4.19.36-vhulk1907.1.0.h1032.eulerosv2r8",
        "kernel-tools-libs-4.19.36-vhulk1907.1.0.h1032.eulerosv2r8",
        "perf-4.19.36-vhulk1907.1.0.h1032.eulerosv2r8",
        "python-perf-4.19.36-vhulk1907.1.0.h1032.eulerosv2r8",
        "python3-perf-4.19.36-vhulk1907.1.0.h1032.eulerosv2r8"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"8", 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");
}