CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:S/C:P/I:P/A:P
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
AI Score
Confidence
High
EPSS
Percentile
82.1%
The remote CentOS Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the runc-1.1.7-2.el9 build changelog.
runc is a CLI tool for spawning and running containers on Linux according to the OCI specification. In runc, netlink is used internally as a serialization system for specifying the relevant container configuration to the C
portion of the code (responsible for the based namespace setup of containers). In all versions of runc prior to 1.0.3, the encoder did not handle the possibility of an integer overflow in the 16-bit length field for the byte array attribute type, meaning that a large enough malicious byte array attribute could result in the length overflowing and the attribute contents being parsed as netlink messages for container configuration. This vulnerability requires the attacker to have some control over the configuration of the container and would allow the attacker to bypass the namespace restrictions of the container by simply adding their own netlink payload which disables all namespaces. The main users impacted are those who allow untrusted images with untrusted configurations to run on their machines (such as with shared cloud infrastructure). runc version 1.0.3 contains a fix for this bug. As a workaround, one may try disallowing untrusted namespace paths from your container. It should be noted that untrusted namespace paths would allow the attacker to disable namespace protections entirely even in the absence of this bug. (CVE-2021-43784)
Large handshake records may cause panics in crypto/tls. Both clients and servers may send large TLS handshake records which cause servers and clients, respectively, to panic when attempting to construct responses. This affects all TLS 1.3 clients, TLS 1.2 clients which explicitly enable session resumption (by setting Config.ClientSessionCache to a non-nil value), and TLS 1.3 servers which request client certificates (by setting Config.ClientAuth >= RequestClientCert). (CVE-2022-41724)
runc is a CLI tool for spawning and running containers according to the OCI specification. It was found that AppArmor can be bypassed when /proc
inside the container is symlinked with a specific mount configuration. This issue has been fixed in runc version 1.1.5, by prohibiting symlinked /proc
. See PR #3785 for details. users are advised to upgrade. Users unable to upgrade should avoid using an untrusted container image. (CVE-2023-28642)
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(191389);
script_version("1.1");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/26");
script_cve_id("CVE-2021-43784", "CVE-2022-41724", "CVE-2023-28642");
script_name(english:"CentOS 9 : runc-1.1.7-2.el9");
script_set_attribute(attribute:"synopsis", value:
"The remote CentOS host is missing one or more security updates for runc.");
script_set_attribute(attribute:"description", value:
"The remote CentOS Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the
runc-1.1.7-2.el9 build changelog.
- runc is a CLI tool for spawning and running containers on Linux according to the OCI specification. In
runc, netlink is used internally as a serialization system for specifying the relevant container
configuration to the `C` portion of the code (responsible for the based namespace setup of containers). In
all versions of runc prior to 1.0.3, the encoder did not handle the possibility of an integer overflow in
the 16-bit length field for the byte array attribute type, meaning that a large enough malicious byte
array attribute could result in the length overflowing and the attribute contents being parsed as netlink
messages for container configuration. This vulnerability requires the attacker to have some control over
the configuration of the container and would allow the attacker to bypass the namespace restrictions of
the container by simply adding their own netlink payload which disables all namespaces. The main users
impacted are those who allow untrusted images with untrusted configurations to run on their machines (such
as with shared cloud infrastructure). runc version 1.0.3 contains a fix for this bug. As a workaround, one
may try disallowing untrusted namespace paths from your container. It should be noted that untrusted
namespace paths would allow the attacker to disable namespace protections entirely even in the absence of
this bug. (CVE-2021-43784)
- Large handshake records may cause panics in crypto/tls. Both clients and servers may send large TLS
handshake records which cause servers and clients, respectively, to panic when attempting to construct
responses. This affects all TLS 1.3 clients, TLS 1.2 clients which explicitly enable session resumption
(by setting Config.ClientSessionCache to a non-nil value), and TLS 1.3 servers which request client
certificates (by setting Config.ClientAuth >= RequestClientCert). (CVE-2022-41724)
- runc is a CLI tool for spawning and running containers according to the OCI specification. It was found
that AppArmor can be bypassed when `/proc` inside the container is symlinked with a specific mount
configuration. This issue has been fixed in runc version 1.1.5, by prohibiting symlinked `/proc`. See PR
#3785 for details. users are advised to upgrade. Users unable to upgrade should avoid using an untrusted
container image. (CVE-2023-28642)
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=33736");
script_set_attribute(attribute:"solution", value:
"Update the CentOS 9 Stream runc package.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:P");
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-2021-43784");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2023-28642");
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:"2021/12/06");
script_set_attribute(attribute:"patch_publication_date", value:"2023/06/14");
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:runc");
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 ('aarch64' >!< cpu && 's390' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'CentOS', cpu);
var pkgs = [
{'reference':'runc-1.1.7-2.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'4'}
];
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, 'runc');
}
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:S/C:P/I:P/A:P
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
AI Score
Confidence
High
EPSS
Percentile
82.1%