7.8 High
CVSS3
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
8.2 High
AI Score
Confidence
High
0.008 Low
EPSS
Percentile
81.5%
The remote CentOS Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the python3.9-3.9.16-1.el9 build changelog.
Python 3.9.x before 3.9.16 and 3.10.x before 3.10.9 on Linux allows local privilege escalation in a non- default configuration. The Python multiprocessing library, when used with the forkserver start method on Linux, allows pickles to be deserialized from any user in the same machine local network namespace, which in many system configurations means any user on the same machine. Pickles can execute arbitrary code.
Thus, this allows for local user privilege escalation to the user that any forkserver process is running as. Setting multiprocessing.util.abstract_sockets_supported to False is a workaround. The forkserver start method for multiprocessing is not the default start method. This issue is Linux specific because only Linux supports abstract namespace sockets. CPython before 3.9 does not make use of Linux abstract namespace sockets by default. Support for users manually specifying an abstract namespace socket was added as a bugfix in 3.7.8 and 3.8.3, but users would need to make specific uncommon API calls in order to do that in CPython before 3.9. (CVE-2022-42919)
An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname.
For example, the attack payload could be placed in the Location header of an HTTP response with status code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16. (CVE-2022-45061)
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 package checks in this plugin were extracted from
# the CentOS Stream Build Service.
##
include('compat.inc');
if (description)
{
script_id(191189);
script_version("1.1");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/26");
script_cve_id("CVE-2022-42919", "CVE-2022-45061");
script_name(english:"CentOS 9 : python3.9-3.9.16-1.el9");
script_set_attribute(attribute:"synopsis", value:
"The remote CentOS host is missing one or more security updates for python-unversioned-command.");
script_set_attribute(attribute:"description", value:
"The remote CentOS Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the
python3.9-3.9.16-1.el9 build changelog.
- Python 3.9.x before 3.9.16 and 3.10.x before 3.10.9 on Linux allows local privilege escalation in a non-
default configuration. The Python multiprocessing library, when used with the forkserver start method on
Linux, allows pickles to be deserialized from any user in the same machine local network namespace, which
in many system configurations means any user on the same machine. Pickles can execute arbitrary code.
Thus, this allows for local user privilege escalation to the user that any forkserver process is running
as. Setting multiprocessing.util.abstract_sockets_supported to False is a workaround. The forkserver start
method for multiprocessing is not the default start method. This issue is Linux specific because only
Linux supports abstract namespace sockets. CPython before 3.9 does not make use of Linux abstract
namespace sockets by default. Support for users manually specifying an abstract namespace socket was added
as a bugfix in 3.7.8 and 3.8.3, but users would need to make specific uncommon API calls in order to do
that in CPython before 3.9. (CVE-2022-42919)
- An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path
when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name
being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by
remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger
excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname.
For example, the attack payload could be placed in the Location header of an HTTP response with status
code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16. (CVE-2022-45061)
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://kojihub.stream.centos.org/koji/buildinfo?buildID=27803");
script_set_attribute(attribute:"solution", value:
"Update the CentOS 9 Stream python-unversioned-command 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:POC/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:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-42919");
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:"2022/11/07");
script_set_attribute(attribute:"patch_publication_date", value:"2022/12/12");
script_set_attribute(attribute:"plugin_publication_date", value:"2024/02/29");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:centos:centos:9");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python-unversioned-command");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-debug");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-idle");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-test");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-tkinter");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"CentOS Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list", "Host/cpu");
exit(0);
}
include('rpm.inc');
include('rhel.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/CentOS/release');
if (isnull(os_release) || 'CentOS' >!< os_release) audit(AUDIT_OS_NOT, 'CentOS');
var os_ver = pregmatch(pattern: "CentOS(?: Stream)?(?: Linux)? release ([0-9]+)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'CentOS');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '9')) audit(AUDIT_OS_NOT, 'CentOS 9.x', 'CentOS ' + os_ver);
if (!get_kb_item('Host/CentOS/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 && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'CentOS', cpu);
var pkgs = [
{'reference':'python-unversioned-command-3.9.16-1.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-3.9.16-1.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-debug-3.9.16-1.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-devel-3.9.16-1.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-idle-3.9.16-1.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-libs-3.9.16-1.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-test-3.9.16-1.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python3-tkinter-3.9.16-1.el9', '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;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) _release = 'CentOS-' + 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 (reference && _release) {
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, 'python-unversioned-command / python3 / python3-debug / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
centos | centos | 9 | cpe:/a:centos:centos:9 |
centos | centos | python-unversioned-command | p-cpe:/a:centos:centos:python-unversioned-command |
centos | centos | python3 | p-cpe:/a:centos:centos:python3 |
centos | centos | python3-debug | p-cpe:/a:centos:centos:python3-debug |
centos | centos | python3-devel | p-cpe:/a:centos:centos:python3-devel |
centos | centos | python3-idle | p-cpe:/a:centos:centos:python3-idle |
centos | centos | python3-libs | p-cpe:/a:centos:centos:python3-libs |
centos | centos | python3-test | p-cpe:/a:centos:centos:python3-test |
centos | centos | python3-tkinter | p-cpe:/a:centos:centos:python3-tkinter |
7.8 High
CVSS3
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
8.2 High
AI Score
Confidence
High
0.008 Low
EPSS
Percentile
81.5%