6.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.7 High
AI Score
Confidence
Low
7.2 High
CVSS2
Access Vector
Access Complexity
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.001 Low
EPSS
Percentile
36.7%
The remote CentOS Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the rpm-4.16.1.3-26.el9 build changelog.
A race condition vulnerability was found in rpm. A local unprivileged user could use this flaw to bypass the checks that were introduced in response to CVE-2017-7500 and CVE-2017-7501, potentially gaining root privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-35937)
A symbolic link issue was found in rpm. It occurs when rpm sets the desired permissions and credentials after installing a file. A local unprivileged user could use this flaw to exchange the original file with a symbolic link to a security-critical file and escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
(CVE-2021-35938)
It was found that the fix for CVE-2017-7500 and CVE-2017-7501 was incomplete: the check was only implemented for the parent directory of the file to be created. A local unprivileged user who owns another ancestor directory could potentially use this flaw to gain root privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-35939)
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(193941);
script_version("1.0");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/26");
script_cve_id("CVE-2021-35937", "CVE-2021-35938", "CVE-2021-35939");
script_name(english:"CentOS 9 : rpm-4.16.1.3-26.el9");
script_set_attribute(attribute:"synopsis", value:
"The remote CentOS host is missing one or more security updates for python3-rpm.");
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
rpm-4.16.1.3-26.el9 build changelog.
- A race condition vulnerability was found in rpm. A local unprivileged user could use this flaw to bypass
the checks that were introduced in response to CVE-2017-7500 and CVE-2017-7501, potentially gaining root
privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as
system availability. (CVE-2021-35937)
- A symbolic link issue was found in rpm. It occurs when rpm sets the desired permissions and credentials
after installing a file. A local unprivileged user could use this flaw to exchange the original file with
a symbolic link to a security-critical file and escalate their privileges on the system. The highest
threat from this vulnerability is to data confidentiality and integrity as well as system availability.
(CVE-2021-35938)
- It was found that the fix for CVE-2017-7500 and CVE-2017-7501 was incomplete: the check was only
implemented for the parent directory of the file to be created. A local unprivileged user who owns another
ancestor directory could potentially use this flaw to gain root privileges. The highest threat from this
vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-35939)
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=41133");
script_set_attribute(attribute:"solution", value:
"Update the CentOS 9 Stream python3-rpm package.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/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:L/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-2021-35939");
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:"2022/08/25");
script_set_attribute(attribute:"patch_publication_date", value:"2023/11/21");
script_set_attribute(attribute:"plugin_publication_date", value:"2024/04/26");
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:python3-rpm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-apidocs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-build");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-build-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-cron");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-audit");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-fapolicyd");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-ima");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-prioreset");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-selinux");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-syslog");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-systemd-inhibit");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-sign");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-sign-libs");
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':'python3-rpm-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-apidocs-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-build-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-build-libs-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-cron-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-devel-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-libs-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-plugin-audit-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-plugin-fapolicyd-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-plugin-ima-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-plugin-prioreset-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-plugin-selinux-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-plugin-syslog-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-plugin-systemd-inhibit-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-sign-4.16.1.3-26.el9', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rpm-sign-libs-4.16.1.3-26.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, 'python3-rpm / rpm / rpm-apidocs / rpm-build / rpm-build-libs / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
centos | centos | 9 | cpe:/a:centos:centos:9 |
centos | centos | python3-rpm | p-cpe:/a:centos:centos:python3-rpm |
centos | centos | rpm | p-cpe:/a:centos:centos:rpm |
centos | centos | rpm-apidocs | p-cpe:/a:centos:centos:rpm-apidocs |
centos | centos | rpm-build | p-cpe:/a:centos:centos:rpm-build |
centos | centos | rpm-build-libs | p-cpe:/a:centos:centos:rpm-build-libs |
centos | centos | rpm-cron | p-cpe:/a:centos:centos:rpm-cron |
centos | centos | rpm-devel | p-cpe:/a:centos:centos:rpm-devel |
centos | centos | rpm-libs | p-cpe:/a:centos:centos:rpm-libs |
centos | centos | rpm-plugin-audit | p-cpe:/a:centos:centos:rpm-plugin-audit |
6.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.7 High
AI Score
Confidence
Low
7.2 High
CVSS2
Access Vector
Access Complexity
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.001 Low
EPSS
Percentile
36.7%