CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
79.3%
The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:0834 advisory.
Open vSwitch provides standard network bridging functions and support for the OpenFlow protocol for remote per-flow control of traffic.
Security Fix(es):
* openvswitch: limitation in the OVS packet parsing in userspace leads to DoS (CVE-2020-35498)
* lldp/openvswitch: denial of service via externally triggered memory leak (CVE-2020-27827)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2021:0834. The text
# itself is copyright (C) Red Hat, Inc.
##
include('compat.inc');
if (description)
{
script_id(147810);
script_version("1.12");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/04");
script_cve_id("CVE-2020-27827", "CVE-2020-35498");
script_xref(name:"RHSA", value:"2021:0834");
script_name(english:"RHEL 7 : openvswitch2.11 (RHSA-2021:0834)");
script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for openvswitch2.11.");
script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2021:0834 advisory.
Open vSwitch provides standard network bridging functions and support for
the OpenFlow protocol for remote per-flow control of traffic.
Security Fix(es):
* openvswitch: limitation in the OVS packet parsing in userspace leads to DoS (CVE-2020-35498)
* lldp/openvswitch: denial of service via externally triggered memory leak (CVE-2020-27827)
For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References
section.
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
# https://access.redhat.com/security/data/csaf/v2/advisories/2021/rhsa-2021_0834.json
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6ef2714c");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#moderate");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2021:0834");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1908845");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1921438");
script_set_attribute(attribute:"solution", value:
"Update the RHEL openvswitch2.11 package based on the guidance in RHSA-2021:0834.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-35498");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_cwe_id(400);
script_set_attribute(attribute:"vendor_severity", value:"Moderate");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/02/11");
script_set_attribute(attribute:"patch_publication_date", value:"2021/03/15");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/03/15");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openvswitch2.11");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openvswitch2.11-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openvswitch2.11-test");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python-openvswitch2.11");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Red Hat Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl", "redhat_repos.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/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/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '7')) audit(AUDIT_OS_NOT, 'Red Hat 7.x', 'Red Hat ' + 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$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);
var constraints = [
{
'repo_relative_urls': [
'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/fast-datapath/debug',
'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/fast-datapath/os',
'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/fast-datapath/source/SRPMS',
'content/dist/rhel/power-le/7/7Server/ppc64le/fast-datapath/debug',
'content/dist/rhel/power-le/7/7Server/ppc64le/fast-datapath/os',
'content/dist/rhel/power-le/7/7Server/ppc64le/fast-datapath/source/SRPMS',
'content/dist/rhel/server/7/7Server/x86_64/fast-datapath/debug',
'content/dist/rhel/server/7/7Server/x86_64/fast-datapath/os',
'content/dist/rhel/server/7/7Server/x86_64/fast-datapath/source/SRPMS',
'content/dist/rhel/system-z/7/7Server/s390x/fast-datapath/debug',
'content/dist/rhel/system-z/7/7Server/s390x/fast-datapath/os',
'content/dist/rhel/system-z/7/7Server/s390x/fast-datapath/source/SRPMS'
],
'pkgs': [
{'reference':'openvswitch2.11-2.11.3-86.el7fdp', 'cpu':'ppc64le', 'release':'7', 'el_string':'el7fdp', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openvswitch'},
{'reference':'openvswitch2.11-2.11.3-86.el7fdp', 'cpu':'s390x', 'release':'7', 'el_string':'el7fdp', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openvswitch'},
{'reference':'openvswitch2.11-2.11.3-86.el7fdp', 'cpu':'x86_64', 'release':'7', 'el_string':'el7fdp', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openvswitch'},
{'reference':'openvswitch2.11-devel-2.11.3-86.el7fdp', 'cpu':'ppc64le', 'release':'7', 'el_string':'el7fdp', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openvswitch'},
{'reference':'openvswitch2.11-devel-2.11.3-86.el7fdp', 'cpu':'s390x', 'release':'7', 'el_string':'el7fdp', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openvswitch'},
{'reference':'openvswitch2.11-devel-2.11.3-86.el7fdp', 'cpu':'x86_64', 'release':'7', 'el_string':'el7fdp', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openvswitch'},
{'reference':'openvswitch2.11-test-2.11.3-86.el7fdp', 'release':'7', 'el_string':'el7fdp', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openvswitch'},
{'reference':'python-openvswitch2.11-2.11.3-86.el7fdp', 'cpu':'ppc64le', 'release':'7', 'el_string':'el7fdp', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openvswitch'},
{'reference':'python-openvswitch2.11-2.11.3-86.el7fdp', 'cpu':'s390x', 'release':'7', 'el_string':'el7fdp', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openvswitch'},
{'reference':'python-openvswitch2.11-2.11.3-86.el7fdp', 'cpu':'x86_64', 'release':'7', 'el_string':'el7fdp', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openvswitch'}
]
}
];
var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);
var flag = 0;
foreach var constraint_array ( constraints ) {
var repo_relative_urls = NULL;
if (!empty_or_null(constraint_array['repo_relative_urls'])) repo_relative_urls = constraint_array['repo_relative_urls'];
foreach var pkg ( constraint_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;
var cves = NULL;
if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
if (reference &&
_release &&
rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
(applicable_repo_urls || (!exists_check || 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, cves:cves)) flag++;
}
}
if (flag)
{
var extra = NULL;
if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
else extra = rpm_report_get();
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : extra
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'openvswitch2.11 / openvswitch2.11-devel / openvswitch2.11-test / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
redhat | enterprise_linux | openvswitch2.11-test | p-cpe:/a:redhat:enterprise_linux:openvswitch2.11-test |
redhat | enterprise_linux | 7 | cpe:/o:redhat:enterprise_linux:7 |
redhat | enterprise_linux | python-openvswitch2.11 | p-cpe:/a:redhat:enterprise_linux:python-openvswitch2.11 |
redhat | enterprise_linux | openvswitch2.11 | p-cpe:/a:redhat:enterprise_linux:openvswitch2.11 |
redhat | enterprise_linux | openvswitch2.11-devel | p-cpe:/a:redhat:enterprise_linux:openvswitch2.11-devel |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27827
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35498
www.nessus.org/u?6ef2714c
access.redhat.com/errata/RHSA-2021:0834
access.redhat.com/security/updates/classification/#moderate
bugzilla.redhat.com/show_bug.cgi?id=1908845
bugzilla.redhat.com/show_bug.cgi?id=1921438
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
79.3%