CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
70.1%
The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2020-1556 advisory.
In binder_release_work of binder.c, there is a possible use-after-free due to improper locking. This could lead to local escalation of privilege in the kernel with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID:
A-161151868References: N/A (CVE-2020-0423)
In the Linux kernel through 5.8.7, local attackers able to inject conntrack netlink configuration could overflow a local buffer, causing crashes or triggering use of incorrect protocol numbers in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c, aka CID-1cc5ef91d2ff.
(CVE-2020-25211)
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2020-1556.
##
include('compat.inc');
if (description)
{
script_id(142722);
script_version("1.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/05/11");
script_cve_id(
"CVE-2020-0423",
"CVE-2020-12351",
"CVE-2020-12352",
"CVE-2020-24490",
"CVE-2020-25211"
);
script_xref(name:"ALAS", value:"2020-1556");
script_name(english:"Amazon Linux 2 : kernel (ALAS-2020-1556)");
script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
script_set_attribute(attribute:"description", value:
"The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by
multiple vulnerabilities as referenced in the ALAS2-2020-1556 advisory.
- In binder_release_work of binder.c, there is a possible use-after-free due to improper locking. This could
lead to local escalation of privilege in the kernel with no additional execution privileges needed. User
interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID:
A-161151868References: N/A (CVE-2020-0423)
- In the Linux kernel through 5.8.7, local attackers able to inject conntrack netlink configuration could
overflow a local buffer, causing crashes or triggering use of incorrect protocol numbers in
ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c, aka CID-1cc5ef91d2ff.
(CVE-2020-25211)
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://alas.aws.amazon.com/AL2/ALAS-2020-1556.html");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-0423");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-12351");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-12352");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-24490");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-25211");
script_set_attribute(attribute:"solution", value:
"Run 'yum update kernel' to update your system.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/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:A/AC:L/PR:N/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-2020-0423");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-12351");
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:"2020/09/09");
script_set_attribute(attribute:"patch_publication_date", value:"2020/11/09");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/11/11");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-aarch64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-headers");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-livepatch-4.14.203-156.332");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perf");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:perf-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python-perf");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python-perf-debuginfo");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Amazon Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2020-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("rpm.inc");
include("hotfixes.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "2")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
if (get_one_kb_item("Host/kpatch/kernel-cves"))
{
set_hotfix_type("kpatch");
cve_list = make_list("CVE-2020-0423", "CVE-2020-12351", "CVE-2020-12352", "CVE-2020-24490", "CVE-2020-25211");
if (hotfix_cves_check(cve_list))
{
audit(AUDIT_PATCH_INSTALLED, "kpatch hotfix for ALAS-2020-1556");
}
else
{
__rpm_report = hotfix_reporting_text();
}
}
pkgs = [
{'reference':'kernel-4.14.203-156.332.amzn2', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'kernel-4.14.203-156.332.amzn2', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'kernel-debuginfo-4.14.203-156.332.amzn2', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'kernel-debuginfo-4.14.203-156.332.amzn2', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'kernel-debuginfo-common-aarch64-4.14.203-156.332.amzn2', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'kernel-debuginfo-common-x86_64-4.14.203-156.332.amzn2', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'kernel-devel-4.14.203-156.332.amzn2', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'kernel-devel-4.14.203-156.332.amzn2', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'kernel-headers-4.14.203-156.332.amzn2', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'kernel-headers-4.14.203-156.332.amzn2', 'cpu':'i686', 'release':'AL2'},
{'reference':'kernel-headers-4.14.203-156.332.amzn2', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'kernel-livepatch-4.14.203-156.332-1.0-0.amzn2', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'kernel-tools-4.14.203-156.332.amzn2', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'kernel-tools-4.14.203-156.332.amzn2', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'kernel-tools-debuginfo-4.14.203-156.332.amzn2', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'kernel-tools-debuginfo-4.14.203-156.332.amzn2', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'kernel-tools-devel-4.14.203-156.332.amzn2', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'kernel-tools-devel-4.14.203-156.332.amzn2', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'perf-4.14.203-156.332.amzn2', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'perf-4.14.203-156.332.amzn2', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'perf-debuginfo-4.14.203-156.332.amzn2', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'perf-debuginfo-4.14.203-156.332.amzn2', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'python-perf-4.14.203-156.332.amzn2', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'python-perf-4.14.203-156.332.amzn2', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'python-perf-debuginfo-4.14.203-156.332.amzn2', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'python-perf-debuginfo-4.14.203-156.332.amzn2', 'cpu':'x86_64', 'release':'AL2'}
];
flag = 0;
foreach package_array ( pkgs ) {
reference = NULL;
release = NULL;
cpu = NULL;
el_string = NULL;
rpm_spec_vers_cmp = NULL;
allowmaj = NULL;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) release = package_array['release'];
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['allowmaj'])) allowmaj = package_array['allowmaj'];
if (reference && release) {
if (rpm_check(release:release, cpu:cpu, reference:reference, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
}
}
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : rpm_report_get()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "kernel / kernel-debuginfo / kernel-debuginfo-common-x86_64 / etc");
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-0423
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12351
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12352
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-24490
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25211
access.redhat.com/security/cve/CVE-2020-0423
access.redhat.com/security/cve/CVE-2020-12351
access.redhat.com/security/cve/CVE-2020-12352
access.redhat.com/security/cve/CVE-2020-24490
access.redhat.com/security/cve/CVE-2020-25211
alas.aws.amazon.com/AL2/ALAS-2020-1556.html
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
70.1%