Oracle Linux 9 : kernel (ELSA-2023-5069)

2023-09-1500:00:00

www.tenable.com

oracle linux 9

multiple vulnerabilities

speculative execution

use-after-free

local privilege escalation

netfilter

kernel

elsa-2023-5069 advisory

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.001

Percentile

18.3%

JSON

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2023-5069 advisory.

A flaw that boot CPU could be vulnerable for the speculative execution behavior kind of attacks in the Linux kernel X86 CPU Power management options functionality was found in the way user resuming CPU from suspend-to-RAM. A local user could use this flaw to potentially get unauthorized access to some memory of the CPU similar to the speculative execution behavior kind of attacks. (CVE-2023-1637)
A use-after-free vulnerability in the Linux kernel’s net/sched: cls_fw component can be exploited to achieve local privilege escalation. If tcf_change_indev() fails, fw_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. We recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.
(CVE-2023-3776)
In __efi_rt_asm_wrapper of efi-rt-wrapper.S, there is a possible bypass of shadow stack protection due to a logic error in the code. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-260821414References: Upstream kernel (CVE-2023-21102)
A use-after-free flaw was found in the Linux kernel’s Netfilter functionality when adding a rule with NFTA_RULE_CHAIN_ID. This flaw allows a local user to crash or escalate their privileges on the system.
(CVE-2023-4147)
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 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)
A use-after-free vulnerability in the Linux kernel’s netfilter: nf_tables component can be exploited to achieve local privilege escalation. Flaw in the error handling of bound chains causes a use-after-free in the abort path of NFT_MSG_NEWRULE. The vulnerability requires CAP_NET_ADMIN to be triggered. We recommend upgrading past commit 4bedf9eee016286c835e3d8fa981ddece5338795. (CVE-2023-3610)
A use-after-free flaw was found in the Linux kernel’s netfilter in the way a user triggers the nft_pipapo_remove function with the element, without a NFT_SET_EXT_KEY_END. This issue could allow a local user to crash the system or potentially escalate their privileges on the system. (CVE-2023-4004)
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.

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Oracle Linux Security Advisory ELSA-2023-5069.
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if (description)
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    "CVE-2023-3390",
    "CVE-2023-3776",
    "CVE-2023-4004",
    "CVE-2023-4147",
    "CVE-2023-21102",
    "CVE-2023-31248",
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  script_set_attribute(attribute:"synopsis", value:
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  script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ELSA-2023-5069 advisory.

  - A flaw that boot CPU could be vulnerable for the speculative execution behavior kind of attacks in the
    Linux kernel X86 CPU Power management options functionality was found in the way user resuming CPU from
    suspend-to-RAM. A local user could use this flaw to potentially get unauthorized access to some memory of
    the CPU similar to the speculative execution behavior kind of attacks. (CVE-2023-1637)

  - A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to
    achieve local privilege escalation. If tcf_change_indev() fails, fw_set_parms() will immediately return an
    error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can
    control the reference counter and set it to zero, they can cause the reference to be freed, leading to a
    use-after-free vulnerability. We recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.
    (CVE-2023-3776)

  - In __efi_rt_asm_wrapper of efi-rt-wrapper.S, there is a possible bypass of shadow stack protection due to
    a logic error in the code. This could lead to local escalation of privilege with no additional execution
    privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android
    kernelAndroid ID: A-260821414References: Upstream kernel (CVE-2023-21102)

  - A use-after-free flaw was found in the Linux kernel's Netfilter functionality when adding a rule with
    NFTA_RULE_CHAIN_ID. This flaw allows a local user to crash or escalate their privileges on the system.
    (CVE-2023-4147)

  - 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 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)

  - A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to
    achieve local privilege escalation. Flaw in the error handling of bound chains causes a use-after-free in
    the abort path of NFT_MSG_NEWRULE. The vulnerability requires CAP_NET_ADMIN to be triggered. We recommend
    upgrading past commit 4bedf9eee016286c835e3d8fa981ddece5338795. (CVE-2023-3610)

  - A use-after-free flaw was found in the Linux kernel's netfilter in the way a user triggers the
    nft_pipapo_remove function with the element, without a NFT_SET_EXT_KEY_END. This issue could allow a local
    user to crash the system or potentially escalate their privileges on the system. (CVE-2023-4004)

  - 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.");
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  script_category(ACT_GATHER_INFO);
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  script_dependencies("linux_alt_patch_detect.nasl", "ssh_get_info.nasl");
  script_require_keys("Host/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/local_checks_enabled");

  exit(0);
}


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

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item('Host/OracleLinux')) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_release = get_kb_item("Host/RedHat/release");
if (isnull(os_release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:os_release)) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
os_ver = os_ver[1];
if (! preg(pattern:"^9([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Oracle Linux 9', 'Oracle Linux ' + os_ver);

if (!get_kb_item('Host/RedHat/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$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Oracle Linux', cpu);

var machine_uptrack_level = get_one_kb_item('Host/uptrack-uname-r');
if (machine_uptrack_level)
{
  var trimmed_uptrack_level = ereg_replace(string:machine_uptrack_level, pattern:"\.(x86_64|i[3-6]86|aarch64)$", replace:'');
  var fixed_uptrack_levels = ['5.14.0-284.30.0.1.el9_2'];
  foreach var fixed_uptrack_level ( fixed_uptrack_levels ) {
    if (rpm_spec_vers_cmp(a:trimmed_uptrack_level, b:fixed_uptrack_level) >= 0)
    {
      audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for ELSA-2023-5069');
    }
  }
  __rpm_report = 'Running KSplice level of ' + trimmed_uptrack_level + ' does not meet the minimum fixed level of ' + join(fixed_uptrack_levels, sep:' / ') + ' for this advisory.\n\n';
}

var kernel_major_minor = get_kb_item('Host/uname/major_minor');
if (empty_or_null(kernel_major_minor)) exit(1, 'Unable to determine kernel major-minor level.');
var expected_kernel_major_minor = '5.14';
if (kernel_major_minor != expected_kernel_major_minor)
  audit(AUDIT_OS_NOT, 'running kernel level ' + expected_kernel_major_minor + ', it is running kernel level ' + kernel_major_minor);

var pkgs = [
    {'reference':'bpftool-7.0.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-5.14.0'},
    {'reference':'kernel-abi-stablelists-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-abi-stablelists-5.14.0'},
    {'reference':'kernel-core-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-core-5.14.0'},
    {'reference':'kernel-cross-headers-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-cross-headers-5.14.0'},
    {'reference':'kernel-debug-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-5.14.0'},
    {'reference':'kernel-debug-core-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-core-5.14.0'},
    {'reference':'kernel-debug-devel-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-devel-5.14.0'},
    {'reference':'kernel-debug-devel-matched-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-devel-matched-5.14.0'},
    {'reference':'kernel-debug-modules-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-modules-5.14.0'},
    {'reference':'kernel-debug-modules-core-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-modules-core-5.14.0'},
    {'reference':'kernel-debug-modules-extra-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-modules-extra-5.14.0'},
    {'reference':'kernel-debug-uki-virt-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-uki-virt-5.14.0'},
    {'reference':'kernel-devel-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-devel-5.14.0'},
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    {'reference':'kernel-modules-5.14.0-284.30.0.1.el9_2', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-modules-5.14.0'},
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    {'reference':'kernel-core-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-core-5.14.0'},
    {'reference':'kernel-cross-headers-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-cross-headers-5.14.0'},
    {'reference':'kernel-debug-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-5.14.0'},
    {'reference':'kernel-debug-core-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-core-5.14.0'},
    {'reference':'kernel-debug-devel-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-devel-5.14.0'},
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    {'reference':'kernel-debug-modules-core-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-modules-core-5.14.0'},
    {'reference':'kernel-debug-modules-extra-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-modules-extra-5.14.0'},
    {'reference':'kernel-debug-uki-virt-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-debug-uki-virt-5.14.0'},
    {'reference':'kernel-devel-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-devel-5.14.0'},
    {'reference':'kernel-devel-matched-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-devel-matched-5.14.0'},
    {'reference':'kernel-headers-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-headers-5.14.0'},
    {'reference':'kernel-modules-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-modules-5.14.0'},
    {'reference':'kernel-modules-core-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-modules-core-5.14.0'},
    {'reference':'kernel-modules-extra-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-modules-extra-5.14.0'},
    {'reference':'kernel-tools-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-tools-5.14.0'},
    {'reference':'kernel-tools-libs-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-tools-libs-5.14.0'},
    {'reference':'kernel-tools-libs-devel-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-tools-libs-devel-5.14.0'},
    {'reference':'kernel-uki-virt-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uki-virt-5.14.0'},
    {'reference':'perf-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-perf-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'rtla-5.14.0-284.30.0.1.el9_2', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var _release = NULL;
  var sp = NULL;
  var _cpu = NULL;
  var el_string = NULL;
  var rpm_spec_vers_cmp = NULL;
  var epoch = NULL;
  var allowmaj = NULL;
  var exists_check = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = 'EL' + 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['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (reference && _release) {
    if (exists_check) {
        if (rpm_exists(release:_release, rpm:exists_check) && rpm_check(release:_release, sp:sp, cpu:cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
    } else {
        if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
    }
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      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, 'bpftool / kernel / kernel-abi-stablelists / etc');
}