EulerOS Virtualization 2.9.0 : kernel (EulerOS-SA-2021-1751)

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

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

if (description)
{
  script_id(148604);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/04");

  script_cve_id(
    "CVE-2020-0465",
    "CVE-2020-14351",
    "CVE-2020-16120",
    "CVE-2020-25639",
    "CVE-2021-0342",
    "CVE-2021-20177",
    "CVE-2021-27363",
    "CVE-2021-27364",
    "CVE-2021-27365",
    "CVE-2021-3178",
    "CVE-2021-3347",
    "CVE-2021-3348"
  );

  script_name(english:"EulerOS Virtualization 2.9.0 : kernel (EulerOS-SA-2021-1751)");

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

  - An issue was discovered in the Linux kernel through
    5.11.3. A kernel pointer leak can be used to determine
    the address of the iscsi_transport structure. When an
    iSCSI transport is registered with the iSCSI subsystem,
    the transport's handle is available to unprivileged
    users via the sysfs file system, at
    /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When
    read, the show_transport_handle function (in
    drivers/scsi/scsi_transport_iscsi.c) is called, which
    leaks the handle. This handle is actually the pointer
    to an iscsi_transport struct in the kernel module's
    global variables.(CVE-2021-27363)

  - 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)

  - An issue was discovered in the Linux kernel through
    5.11.3. drivers/scsi/scsi_transport_iscsi.c is
    adversely affected by the ability of an unprivileged
    user to craft Netlink messages.(CVE-2021-27364)

  - Overlayfs did not properly perform permission checking
    when copying up files in an overlayfs and could be
    exploited from within a user namespace, if, for
    example, unprivileged user namespaces were allowed. It
    was possible to have a file not readable by an
    unprivileged user to be copied to a mountpoint
    controlled by the user, like a removable device. This
    was introduced in kernel version 4.19 by commit d1d04ef
    ('ovl: stack file ops'). This was fixed in kernel
    version 5.8 by commits 56230d9 ('ovl: verify
    permissions in ovl_path_open()'), 48bd024 ('ovl: switch
    to mounter creds in readdir') and 05acefb ('ovl: check
    permission to open real file'). Additionally, commits
    130fdbc ('ovl: pass correct flags for opening real
    directory') and 292f902 ('ovl: call secutiry hook in
    ovl_real_ioctl()') in kernel 5.8 might also be desired
    or necessary. These additional commits introduced a
    regression in overlay mounts within user namespaces
    which prevented access to files with ownership outside
    of the user namespace. This regression was mitigated by
    subsequent commit b6650da ('ovl: do not fail because of
    O_NOATIMEi') in kernel 5.11.(CVE-2020-16120)

  - A flaw was found in the Linux kernel's implementation
    of string matching within a packet. A privileged user
    (with root or CAP_NET_ADMIN) when inserting iptables
    rules could insert a rule which can panic the
    system.(CVE-2021-20177)

  - fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8,
    when there is an NFS export of a subdirectory of a
    filesystem, allows remote attackers to traverse to
    other parts of the filesystem via READDIRPLUS. NOTE:
    some parties argue that such a subdirectory export is
    not intended to prevent this attack see also the
    exports(5) no_subtree_check default
    behavior.(CVE-2021-3178)

  - nbd_add_socket in drivers/block/nbd.c in the Linux
    kernel through 5.10.12 has an ndb_queue_rq
    use-after-free that could be triggered by local
    attackers (with access to the nbd device) via an I/O
    request at a certain point during device setup, aka
    CID-b98e762e3d71.(CVE-2021-3348)

  - An issue was discovered in the Linux kernel through
    5.10.11. PI futexes have a kernel stack use-after-free
    during fault handling, allowing local users to execute
    code in the kernel, aka
    CID-34b1a1ce1458.(CVE-2021-3347)

  - A flaw use after free in the Linux kernel TUN/TAP
    device driver functionality was found in the way user
    create and use tun/tap device. A local user could use
    this flaw to crash the system or possibly escalate
    their privileges on the system.(CVE-2021-0342)

  - A flaw was found in the Linux kernel. A use-after-free
    memory flaw was found in the perf subsystem allowing a
    local attacker with permission to monitor perf events
    to corrupt memory and possibly escalate privileges. The
    highest threat from this vulnerability is to data
    confidentiality and integrity as well as system
    availability.(CVE-2020-14351)

  - A flaw was found in the Linux kernel's multi-touch
    input system. An out-of-bounds write triggered by a
    use-after-free issue could lead to memory corruption or
    possible privilege escalation. The highest threat from
    this vulnerability is to confidentiality, integrity, as
    well as system availability.(CVE-2020-0465)

  - A NULL pointer dereference flaw was found in the Linux
    kernel's GPU Nouveau driver functionality in the way
    the user calls ioctl DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC.
    This flaw allows a local user to crash the
    system.(CVE-2020-25639)

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-2021-1751
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?50a79922");
  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-2021-3347");

  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:"2021/04/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/04/15");

  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:perf");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:2.9.0");
  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) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "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");
uvp = get_kb_item("Host/EulerOS/uvp_version");
if (uvp != "2.9.0") audit(AUDIT_OS_NOT, "EulerOS Virtualization 2.9.0");
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$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

flag = 0;

pkgs = ["kernel-4.18.0-147.5.1.6.h425.eulerosv2r9",
        "kernel-tools-4.18.0-147.5.1.6.h425.eulerosv2r9",
        "kernel-tools-libs-4.18.0-147.5.1.6.h425.eulerosv2r9",
        "perf-4.18.0-147.5.1.6.h425.eulerosv2r9"];

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