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This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.EULEROS_SA-2021-1009.NASL
HistoryJan 04, 2021 - 12:00 a.m.

EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-1009)

2021-01-0400:00:00
This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
67

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):In create_pinctrl of core.c, there is a possible out of bounds read due to a use after free. This could lead to local information disclosure with no additional execution privileges needed.(CVE-2020-0427)NULL-ptr deref in the spk_ttyio_receive_buf2() function in spk_ttyio.c.(CVE-2020-27830)In do_epoll_ctl and ep_loop_check_proc of eventpoll.c, there is a possible use after free due to a logic error. This could lead to local escalation of privilege with no additional execution privileges needed.(CVE-2020-0466)In the nl80211_policy policy of nl80211.c, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure with System execution privileges needed.(CVE-2020-27068)use-after-free read in sunkbd_reinit in drivers/input/keyboard/sunkbd.c.(CVE-2020-25669)A flaw was found in the Linux kernels implementation of MIDI, where an attacker with a local account and the permissions to issue an ioctl commands to midi devices, could trigger a use-after-free. A write to this specific memory while freed and before use could cause the flow of execution to change and possibly allow for memory corruption or privilege escalation.(CVE-2020-27786)An issue was discovered in romfs_dev_read in fs/romfs/storage.c in the Linux kernel before 5.8.4. Uninitialized memory leaks to userspace, aka CID-bcf85fcedfdd.(CVE-2020-29371)A slab-out-of-bounds read in fbcon in the Linux kernel before 5.9.7 could be used by local attackers to read privileged information or potentially crash the kernel, aka CID-3c4e0dff2095. This occurs because KD_FONT_OP_COPY in drivers/tty/vt/vt.c can be used for manipulations such as font height.(CVE-2020-28974)A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID, aka CID-c8bcd9c5be24.(CVE-2020-29660)A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_jobctrl.c allows a use-after-free attack against TIOCSPGRP, aka CID-54ffccbf053b.(CVE-2020-29661)An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9. Local attackers on systems with the speakup driver could cause a local denial of service attack, aka CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.(CVE-2020-28941)A buffer over-read (at the framebuffer layer) in the fbcon code in the Linux kernel before 5.8.15 could be used by local attackers to read kernel memory, aka CID-6735b4632def.(CVE-2020-28915)A flaw in the way reply ICMP packets are limited in the Linux kernel functionality was found that allows to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypassing source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well.
    Kernel versions before 5.10 may be vulnerable to this issue.(CVE-2020-25705)race condition in fg_console can lead to use-after-free in con_font_op.(CVE-2020-25668)The Linux kernel before version 5.8 is vulnerable to a NULL pointer dereference in drivers/tty/serial/8250/8250_core.c:serial8250_isa_init
    _ports() that allows local users to cause a denial of service by using the p->serial_in pointer which uninitialized.(CVE-2020-15437)An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. Guest OS users can cause a denial of service (host OS hang) via a high rate of events to dom0, aka CID-e99502f76271.(CVE-2020-27673)An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.(CVE-2020-29368)An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x.
    drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5.(CVE-2020-27675)A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries platform) a root like local user could use this flaw to further increase their privileges to that of a running kernel.(CVE-2020-27777)

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.

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

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

if (description)
{
  script_id(144687);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/02/09");

  script_cve_id(
    "CVE-2020-0427",
    "CVE-2020-0466",
    "CVE-2020-15437",
    "CVE-2020-25668",
    "CVE-2020-25669",
    "CVE-2020-25705",
    "CVE-2020-27068",
    "CVE-2020-27673",
    "CVE-2020-27675",
    "CVE-2020-27777",
    "CVE-2020-27786",
    "CVE-2020-27830",
    "CVE-2020-28915",
    "CVE-2020-28941",
    "CVE-2020-28974",
    "CVE-2020-29368",
    "CVE-2020-29371",
    "CVE-2020-29660",
    "CVE-2020-29661"
  );
  script_xref(name:"CEA-ID", value:"CEA-2020-0138");

  script_name(english:"EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-1009)");

  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):In create_pinctrl of
    core.c, there is a possible out of bounds read due to a
    use after free. This could lead to local information
    disclosure with no additional execution privileges
    needed.(CVE-2020-0427)NULL-ptr deref in the
    spk_ttyio_receive_buf2() function in
    spk_ttyio.c.(CVE-2020-27830)In do_epoll_ctl and
    ep_loop_check_proc of eventpoll.c, there is a possible
    use after free due to a logic error. This could lead to
    local escalation of privilege with no additional
    execution privileges needed.(CVE-2020-0466)In the
    nl80211_policy policy of nl80211.c, there is a possible
    out of bounds read due to a missing bounds check. This
    could lead to local information disclosure with System
    execution privileges
    needed.(CVE-2020-27068)use-after-free read in
    sunkbd_reinit in
    drivers/input/keyboard/sunkbd.c.(CVE-2020-25669)A flaw
    was found in the Linux kernels implementation of MIDI,
    where an attacker with a local account and the
    permissions to issue an ioctl commands to midi devices,
    could trigger a use-after-free. A write to this
    specific memory while freed and before use could cause
    the flow of execution to change and possibly allow for
    memory corruption or privilege
    escalation.(CVE-2020-27786)An issue was discovered in
    romfs_dev_read in fs/romfs/storage.c in the Linux
    kernel before 5.8.4. Uninitialized memory leaks to
    userspace, aka CID-bcf85fcedfdd.(CVE-2020-29371)A
    slab-out-of-bounds read in fbcon in the Linux kernel
    before 5.9.7 could be used by local attackers to read
    privileged information or potentially crash the kernel,
    aka CID-3c4e0dff2095. This occurs because
    KD_FONT_OP_COPY in drivers/tty/vt/vt.c can be used for
    manipulations such as font height.(CVE-2020-28974)A
    locking inconsistency issue was discovered in the tty
    subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may
    allow a read-after-free attack against TIOCGSID, aka
    CID-c8bcd9c5be24.(CVE-2020-29660)A locking issue was
    discovered in the tty subsystem of the Linux kernel
    through 5.9.13. drivers/tty/tty_jobctrl.c allows a
    use-after-free attack against TIOCSPGRP, aka
    CID-54ffccbf053b.(CVE-2020-29661)An issue was
    discovered in drivers/accessibility/speakup/spk_ttyio.c
    in the Linux kernel through 5.9.9. Local attackers on
    systems with the speakup driver could cause a local
    denial of service attack, aka CID-d41227544427. This
    occurs because of an invalid free when the line
    discipline is used more than once.(CVE-2020-28941)A
    buffer over-read (at the framebuffer layer) in the
    fbcon code in the Linux kernel before 5.8.15 could be
    used by local attackers to read kernel memory, aka
    CID-6735b4632def.(CVE-2020-28915)A flaw in the way
    reply ICMP packets are limited in the Linux kernel
    functionality was found that allows to quickly scan
    open UDP ports. This flaw allows an off-path remote
    user to effectively bypassing source port UDP
    randomization. The highest threat from this
    vulnerability is to confidentiality and possibly
    integrity, because software that relies on UDP source
    port randomization are indirectly affected as well.
    Kernel versions before 5.10 may be vulnerable to this
    issue.(CVE-2020-25705)race condition in fg_console can
    lead to use-after-free in
    con_font_op.(CVE-2020-25668)The Linux kernel before
    version 5.8 is vulnerable to a NULL pointer dereference
    in
    drivers/tty/serial/8250/8250_core.c:serial8250_isa_init
    _ports() that allows local users to cause a denial of
    service by using the p->serial_in pointer which
    uninitialized.(CVE-2020-15437)An issue was discovered
    in the Linux kernel through 5.9.1, as used with Xen
    through 4.14.x. Guest OS users can cause a denial of
    service (host OS hang) via a high rate of events to
    dom0, aka CID-e99502f76271.(CVE-2020-27673)An issue was
    discovered in __split_huge_pmd in mm/huge_memory.c in
    the Linux kernel before 5.7.5. The copy-on-write
    implementation can grant unintended write access
    because of a race condition in a THP mapcount check,
    aka CID-c444eb564fb1.(CVE-2020-29368)An issue was
    discovered in the Linux kernel through 5.9.1, as used
    with Xen through 4.14.x.
    drivers/xen/events/events_base.c allows event-channel
    removal during the event-handling loop (a race
    condition). This can cause a use-after-free or NULL
    pointer dereference, as demonstrated by a dom0 crash
    via events for an in-reconfiguration paravirtualized
    device, aka CID-073d0552ead5.(CVE-2020-27675)A flaw was
    found in the way RTAS handled memory accesses in
    userspace to kernel communication. On a locked down
    (usually due to Secure Boot) guest system running on
    top of PowerVM or KVM hypervisors (pseries platform) a
    root like local user could use this flaw to further
    increase their privileges to that of a running
    kernel.(CVE-2020-27777)

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-2021-1009
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7964da21");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/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-2020-27068");

  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:"2021/01/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/01/04");

  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$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

flag = 0;

pkgs = ["kernel-4.18.0-147.5.1.2.h314.eulerosv2r9",
        "kernel-tools-4.18.0-147.5.1.2.h314.eulerosv2r9",
        "kernel-tools-libs-4.18.0-147.5.1.2.h314.eulerosv2r9",
        "python3-perf-4.18.0-147.5.1.2.h314.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");
}

References

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