Ubuntu 23.04 : Linux kernel vulnerabilities (USN-6250-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6250-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(178797);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/09");

  script_cve_id(
    "CVE-2023-2640",
    "CVE-2023-3090",
    "CVE-2023-3269",
    "CVE-2023-3389",
    "CVE-2023-3390",
    "CVE-2023-31248",
    "CVE-2023-32629",
    "CVE-2023-35001"
  );
  script_xref(name:"USN", value:"6250-1");

  script_name(english:"Ubuntu 23.04 : Linux kernel vulnerabilities (USN-6250-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 23.04 host has a package installed that is affected by multiple vulnerabilities as referenced in the
USN-6250-1 advisory.

  - On Ubuntu kernels carrying both c914c0e27eb0 and UBUNTU: SAUCE: overlayfs: Skip permission checking for
    trusted.overlayfs.* xattrs, an unprivileged user may set privileged extended attributes on the mounted
    files, leading them to be set on the upper files without the appropriate security checks. (CVE-2023-2640)

  - A heap out-of-bounds write vulnerability in the Linux Kernel ipvlan network driver can be exploited to
    achieve local privilege escalation. The out-of-bounds write is caused by missing skb->cb initialization in
    the ipvlan network driver. The vulnerability is reachable if CONFIG_IPVLAN is enabled. We recommend
    upgrading past commit 90cbed5247439a966b645b34eb0a2e037836ea8e. (CVE-2023-3090)

  - Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability; `nft_chain_lookup_byid()`
    failed to check whether a chain was active and CAP_NET_ADMIN is in any user or network namespace
    (CVE-2023-31248)

  - Local privilege escalation vulnerability in Ubuntu Kernels overlayfs ovl_copy_up_meta_inode_data skip
    permission checks when calling ovl_do_setxattr on Ubuntu kernels (CVE-2023-32629)

  - A vulnerability exists in the memory management subsystem of the Linux kernel. The lock handling for
    accessing and updating virtual memory areas (VMAs) is incorrect, leading to use-after-free problems. This
    issue can be successfully exploited to execute arbitrary kernel code, escalate containers, and gain root
    privileges. (CVE-2023-3269)

  - A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local
    privilege escalation. Racing a io_uring cancel poll request with a linked timeout can cause a UAF in a
    hrtimer. We recommend upgrading past commit ef7dfac51d8ed961b742218f526bd589f3900a59
    (4716c73b188566865bdd79c3a6709696a224ac04 for 5.10 stable and 0e388fce7aec40992eadee654193cad345d62663 for
    5.15 stable). (CVE-2023-3389)

  - A use-after-free vulnerability was found in the Linux kernel's netfilter subsystem in
    net/netfilter/nf_tables_api.c. Mishandled error handling with NFT_MSG_NEWRULE makes it possible to use a
    dangling pointer in the same transaction causing a use-after-free vulnerability. This flaw allows a local
    attacker with user access to cause a privilege escalation issue. We recommend upgrading past commit
    1240eb93f0616b21c675416516ff3d74798fdc97. (CVE-2023-3390)

  - Linux Kernel nftables Out-Of-Bounds Read/Write Vulnerability; nft_byteorder poorly handled vm register
    contents when CAP_NET_ADMIN is in any user or network namespace (CVE-2023-35001)

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://ubuntu.com/security/notices/USN-6250-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/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:L/AC:L/PR:L/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-2023-35001");

  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:"vuln_publication_date", value:"2023/06/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/07/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/07/26");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:23.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1006-ibm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1008-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1008-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1008-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1009-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1009-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1009-lowlatency-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-1010-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-26-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-26-generic-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-6.2.0-26-generic-lpae");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2023-2024 Canonical, Inc. / NASL script (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "linux_alt_patch_detect.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');
include('ksplice.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('23.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 23.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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, 'Ubuntu', cpu);

var kernel_mappings = {
  '23.04': {
    '6.2.0': {
      'generic': '6.2.0-26',
      'generic-64k': '6.2.0-26',
      'generic-lpae': '6.2.0-26',
      'ibm': '6.2.0-1006',
      'aws': '6.2.0-1008',
      'azure': '6.2.0-1008',
      'oracle': '6.2.0-1008',
      'kvm': '6.2.0-1009',
      'lowlatency': '6.2.0-1009',
      'lowlatency-64k': '6.2.0-1009',
      'gcp': '6.2.0-1010'
    }
  }
};

var host_kernel_release = get_kb_item('Host/uptrack-uname-r');
if (empty_or_null(host_kernel_release)) host_kernel_release = get_kb_item_or_exit('Host/uname-r');
var host_kernel_base_version = get_kb_item_or_exit('Host/Debian/kernel-base-version');
var host_kernel_type = get_kb_item_or_exit('Host/Debian/kernel-type');
if(empty_or_null(kernel_mappings[os_release][host_kernel_base_version][host_kernel_type])) audit(AUDIT_INST_VER_NOT_VULN, 'kernel ' + host_kernel_release);

var extra = '';
var kernel_fixed_version = kernel_mappings[os_release][host_kernel_base_version][host_kernel_type] + "-" + host_kernel_type;
if (deb_ver_cmp(ver1:host_kernel_release, ver2:kernel_fixed_version) < 0)
{
  extra = extra + 'Running Kernel level of ' + host_kernel_release + ' does not meet the minimum fixed level of ' + kernel_fixed_version + ' for this advisory.\n\n';
}
  else
{
  audit(AUDIT_PATCH_INSTALLED, 'Kernel package for USN-6250-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2023-2640', 'CVE-2023-3090', 'CVE-2023-3269', 'CVE-2023-3389', 'CVE-2023-3390', 'CVE-2023-31248', 'CVE-2023-32629', 'CVE-2023-35001');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-6250-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}