2.1 Low
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:N/I:N/A:P
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7 High
AI Score
Confidence
Low
0.0004 Low
EPSS
Percentile
5.1%
The version of avahi installed on the remote host is prior to 0.6.31-20. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2023-2372 advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2023-2372.
##
include('compat.inc');
if (description)
{
script_id(186567);
script_version("1.0");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/04");
script_cve_id("CVE-2021-3468");
script_name(english:"Amazon Linux 2 : avahi (ALAS-2023-2372)");
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 avahi installed on the remote host is prior to 0.6.31-20. It is, therefore, affected by a vulnerability
as referenced in the ALAS2-2023-2372 advisory.
- A flaw was found in avahi in versions 0.6 up to 0.8. The event used to signal the termination of the
client connection on the avahi Unix socket is not correctly handled in the client_work function, allowing
a local attacker to trigger an infinite loop. The highest threat from this vulnerability is to the
availability of the avahi service, which becomes unresponsive after this flaw is triggered.
(CVE-2021-3468)
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-2023-2372.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-3468.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
script_set_attribute(attribute:"solution", value:
"Run 'yum update avahi' to update your system.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/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-2021-3468");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/06/02");
script_set_attribute(attribute:"patch_publication_date", value:"2023/11/29");
script_set_attribute(attribute:"plugin_publication_date", value:"2023/12/04");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-autoipd");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-compat-howl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-compat-howl-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-compat-libdns_sd");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-compat-libdns_sd-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-dnsconfd");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-glib");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-glib-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-gobject");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-gobject-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-qt3");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-qt3-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-qt4");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-qt4-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-ui");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-ui-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-ui-gtk3");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:avahi-ui-tools");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Amazon Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2023 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("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_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);
var pkgs = [
{'reference':'avahi-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-autoipd-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-autoipd-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-autoipd-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-compat-howl-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-compat-howl-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-compat-howl-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-compat-howl-devel-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-compat-howl-devel-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-compat-howl-devel-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-compat-libdns_sd-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-compat-libdns_sd-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-compat-libdns_sd-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-compat-libdns_sd-devel-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-compat-libdns_sd-devel-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-compat-libdns_sd-devel-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-debuginfo-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-debuginfo-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-debuginfo-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-devel-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-devel-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-devel-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-dnsconfd-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-dnsconfd-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-dnsconfd-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-glib-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-glib-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-glib-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-glib-devel-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-glib-devel-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-glib-devel-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-gobject-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-gobject-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-gobject-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-gobject-devel-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-gobject-devel-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-gobject-devel-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-libs-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-libs-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-libs-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-qt3-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-qt3-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-qt3-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-qt3-devel-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-qt3-devel-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-qt3-devel-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-qt4-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-qt4-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-qt4-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-qt4-devel-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-qt4-devel-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-qt4-devel-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-tools-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-tools-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-tools-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-ui-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-ui-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-ui-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-ui-devel-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-ui-devel-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-ui-devel-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-ui-gtk3-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-ui-gtk3-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-ui-gtk3-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-ui-tools-0.6.31-20.amzn2.0.3', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-ui-tools-0.6.31-20.amzn2.0.3', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'avahi-ui-tools-0.6.31-20.amzn2.0.3', 'cpu':'x86_64', 'release':'AL2', '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;
var exists_check = 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['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 (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
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_NOTE,
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, "avahi / avahi-autoipd / avahi-compat-howl / etc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
amazon | linux | avahi | p-cpe:/a:amazon:linux:avahi |
amazon | linux | avahi-autoipd | p-cpe:/a:amazon:linux:avahi-autoipd |
amazon | linux | avahi-compat-howl | p-cpe:/a:amazon:linux:avahi-compat-howl |
amazon | linux | avahi-compat-howl-devel | p-cpe:/a:amazon:linux:avahi-compat-howl-devel |
amazon | linux | avahi-compat-libdns_sd | p-cpe:/a:amazon:linux:avahi-compat-libdns_sd |
amazon | linux | avahi-compat-libdns_sd-devel | p-cpe:/a:amazon:linux:avahi-compat-libdns_sd-devel |
amazon | linux | avahi-debuginfo | p-cpe:/a:amazon:linux:avahi-debuginfo |
amazon | linux | avahi-devel | p-cpe:/a:amazon:linux:avahi-devel |
amazon | linux | avahi-dnsconfd | p-cpe:/a:amazon:linux:avahi-dnsconfd |
amazon | linux | avahi-glib | p-cpe:/a:amazon:linux:avahi-glib |
2.1 Low
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:N/I:N/A:P
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7 High
AI Score
Confidence
Low
0.0004 Low
EPSS
Percentile
5.1%