SUSE SLES15 Security Update : kernel (Live Patch 15 for SLE 15 SP2) (SUSE-SU-2021:2577-1)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# SUSE update advisory SUSE-SU-2021:2577-1. The text itself
# is copyright (C) SUSE.
##

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

if (description)
{
  script_id(152167);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/13");

  script_cve_id(
    "CVE-2020-36322",
    "CVE-2020-36385",
    "CVE-2021-3444",
    "CVE-2021-22555",
    "CVE-2021-23133",
    "CVE-2021-27363",
    "CVE-2021-27364",
    "CVE-2021-27365",
    "CVE-2021-28660",
    "CVE-2021-28688",
    "CVE-2021-29154",
    "CVE-2021-32399",
    "CVE-2021-33034",
    "CVE-2021-33909"
  );
  script_xref(name:"IAVA", value:"2021-A-0350");
  script_xref(name:"SuSE", value:"SUSE-SU-2021:2577-1");

  script_name(english:"SUSE SLES15 Security Update : kernel (Live Patch 15 for SLE 15 SP2) (SUSE-SU-2021:2577-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote SUSE host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote SUSE Linux SLES15 host has a package installed that is affected by multiple vulnerabilities as referenced in
the SUSE-SU-2021:2577-1 advisory.

  - 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 before 5.10. drivers/infiniband/core/ucma.c has a use-after-
    free because the ctx is reached via the ctx_list in some ucma_migrate_id situations where ucma_close is
    called, aka CID-f5449e74802c. (CVE-2020-36385)

  - A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c.
    This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name
    space (CVE-2021-22555)

  - 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)

  - 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. drivers/scsi/scsi_transport_iscsi.c is
    adversely affected by the ability of an unprivileged user to craft Netlink messages. (CVE-2021-27364)

  - 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)

  - rtw_wx_set_scan in drivers/staging/rtl8188eu/os_dep/ioctl_linux.c in the Linux kernel through 5.11.6
    allows writing beyond the end of the ->ssid[] array. NOTE: from the perspective of kernel.org releases,
    CVE IDs are not normally used for drivers/staging/* (unfinished work); however, system integrators may
    have situations in which a drivers/staging issue is relevant to their own customer base. (CVE-2021-28660)

  - 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)

  - 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)

  - 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)

  - fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer
    allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an
    unprivileged user, aka CID-8cae8cd89f05. (CVE-2021-33909)

  - 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)

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://bugzilla.suse.com/1182717");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1183120");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1183491");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1183658");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1184171");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1184710");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1184952");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1185847");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1185899");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1185901");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1186285");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1187052");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1188117");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1188257");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2020-36322");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2020-36385");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-22555");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-23133");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-27363");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-27364");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-27365");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-28660");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-28688");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-29154");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-32399");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-33034");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-33909");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-3444");
  # https://lists.suse.com/pipermail/sle-security-updates/2021-July/009234.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?bb668967");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel-livepatch-5_3_18-24_53_4-default package.");
  script_set_cvss_base_vector("CVSS2#AV:A/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:A/AC:L/PR:N/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-2021-28660");

  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:"metasploit_name", value:'Netfilter x_tables Heap OOB Write Privilege Escalation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:"CANVAS");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/03/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/07/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/07/31");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-livepatch-5_3_18-24_53_4-default");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:15");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"SuSE 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/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list");

  exit(0);
}


include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item("Host/SuSE/release");
if (isnull(os_release) || os_release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
var os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'SUSE');
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES15)$", string:os_ver)) audit(AUDIT_OS_NOT, 'SUSE SLES15', 'SUSE (' + os_ver + ')');

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

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'SUSE (' + os_ver + ')', cpu);

var service_pack = get_kb_item("Host/SuSE/patchlevel");
if (isnull(service_pack)) service_pack = "0";
if (os_ver == "SLES15" && (! preg(pattern:"^(2)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES15 SP2", os_ver + " SP" + service_pack);

var pkgs = [
    {'reference':'kernel-livepatch-5_3_18-24_53_4-default-2-2.1', 'sp':'2', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sle-module-live-patching-release-15.2']}
];

var ltss_caveat_required = FALSE;
var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var _release = NULL;
  var sp = NULL;
  var _cpu = NULL;
  var exists_check = NULL;
  var rpm_spec_vers_cmp = 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['exists_check'])) exists_check = package_array['exists_check'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (reference && _release) {
    if (exists_check) {
      var check_flag = 0;
      foreach var check (exists_check) {
        if (!rpm_exists(release:_release, rpm:check)) continue;
        check_flag++;
      }
      if (!check_flag) continue;
    }
    if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) 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-livepatch-5_3_18-24_53_4-default');
}