6.4 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
7.1 High
AI Score
Confidence
Low
0.0004 Low
EPSS
Percentile
5.1%
The remote Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2023-6685 advisory.
Tss2_RC_SetHandler
and Tss2_RC_Decode
both index into layer_handler
with an 8 bit layer number, but the array only has TPM2_ERROR_TSS2_RC_LAYER_COUNT
entries, so trying to add a handler for higher-numbered layers or decode a response code with such a layer number reads/writes past the end of the buffer. This Buffer overrun, could result in arbitrary code execution. An example attack would be a MiTM bus attack that returns 0xFFFFFFFF for the RC. Given the common use case of TPM modules an attacker must have local access to the target machine with local system privileges which allows access to the TPM system. Usually TPM access requires administrative privilege. (CVE-2023-22745)Note that Nessus has not tested for this issue 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-2023-6685.
##
include('compat.inc');
if (description)
{
script_id(185856);
script_version("1.0");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/16");
script_cve_id("CVE-2023-22745");
script_name(english:"Oracle Linux 9 : tpm2-tss (ELSA-2023-6685)");
script_set_attribute(attribute:"synopsis", value:
"The remote Oracle Linux host is missing a security update.");
script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the
ELSA-2023-6685 advisory.
- tpm2-tss is an open source software implementation of the Trusted Computing Group (TCG) Trusted Platform
Module (TPM) 2 Software Stack (TSS2). In affected versions `Tss2_RC_SetHandler` and `Tss2_RC_Decode` both
index into `layer_handler` with an 8 bit layer number, but the array only has
`TPM2_ERROR_TSS2_RC_LAYER_COUNT` entries, so trying to add a handler for higher-numbered layers or decode
a response code with such a layer number reads/writes past the end of the buffer. This Buffer overrun,
could result in arbitrary code execution. An example attack would be a MiTM bus attack that returns
0xFFFFFFFF for the RC. Given the common use case of TPM modules an attacker must have local access to the
target machine with local system privileges which allows access to the TPM system. Usually TPM access
requires administrative privilege. (CVE-2023-22745)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/errata/ELSA-2023-6685.html");
script_set_attribute(attribute:"solution", value:
"Update the affected tpm2-tss and / or tpm2-tss-devel packages.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:M/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:H/PR:H/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-2023-22745");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2023/01/10");
script_set_attribute(attribute:"patch_publication_date", value:"2023/11/11");
script_set_attribute(attribute:"plugin_publication_date", value:"2023/11/16");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:oracle:linux:9::codeready_builder");
script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:9");
script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:9:3:baseos_base");
script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:9::baseos_latest");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:tpm2-tss");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:tpm2-tss-devel");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Oracle Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/local_checks_enabled");
exit(0);
}
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 pkgs = [
{'reference':'tpm2-tss-3.2.2-2.el9', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'tpm2-tss-devel-3.2.2-2.el9', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'tpm2-tss-3.2.2-2.el9', 'cpu':'i686', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'tpm2-tss-devel-3.2.2-2.el9', 'cpu':'i686', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'tpm2-tss-3.2.2-2.el9', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'tpm2-tss-devel-3.2.2-2.el9', '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, 'tpm2-tss / tpm2-tss-devel');
}
Vendor | Product | Version | CPE |
---|---|---|---|
oracle | linux | 9 | cpe:/a:oracle:linux:9::codeready_builder |
oracle | linux | 9 | cpe:/o:oracle:linux:9 |
oracle | linux | 9 | cpe:/o:oracle:linux:9:3:baseos_base |
oracle | linux | 9 | cpe:/o:oracle:linux:9::baseos_latest |
oracle | linux | tpm2-tss | p-cpe:/a:oracle:linux:tpm2-tss |
oracle | linux | tpm2-tss-devel | p-cpe:/a:oracle:linux:tpm2-tss-devel |
6.4 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
7.1 High
AI Score
Confidence
Low
0.0004 Low
EPSS
Percentile
5.1%