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
EPSS
Percentile
51.8%
The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2023:4100 advisory.
named
instance configured to run as a recursive resolver maintains a cache database holding the responses to the queries it has recently sent to authoritative servers. The size limit for that cache database can be configured using the max-cache-size
statement in the configuration file; it defaults to 90% of the total amount of memory available on the host. When the size of the cache reaches 7/8 of the configured limit, a cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets from the cache, to keep memory use below the configured limit. It has been discovered that the effectiveness of the cache-cleaning algorithm used in named
can be severely diminished by querying the resolver for specific RRsets in a certain order, effectively allowing the configured max-cache-size
limit to be significantly exceeded. This issue affects BIND 9 versions 9.11.0 through 9.16.41, 9.18.0 through 9.18.15, 9.19.0 through 9.19.13, 9.11.3-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.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 package checks in this plugin were extracted from
# AlmaLinux Security Advisory ALSA-2023:4100.
##
include('compat.inc');
if (description)
{
script_id(178418);
script_version("1.0");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/18");
script_cve_id("CVE-2023-2828");
script_xref(name:"ALSA", value:"2023:4100");
script_name(english:"AlmaLinux 8 : bind9.16 (ALSA-2023:4100)");
script_set_attribute(attribute:"synopsis", value:
"The remote AlmaLinux host is missing a security update.");
script_set_attribute(attribute:"description", value:
"The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the
ALSA-2023:4100 advisory.
- Every `named` instance configured to run as a recursive resolver maintains a cache database holding the
responses to the queries it has recently sent to authoritative servers. The size limit for that cache
database can be configured using the `max-cache-size` statement in the configuration file; it defaults to
90% of the total amount of memory available on the host. When the size of the cache reaches 7/8 of the
configured limit, a cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets
from the cache, to keep memory use below the configured limit. It has been discovered that the
effectiveness of the cache-cleaning algorithm used in `named` can be severely diminished by querying the
resolver for specific RRsets in a certain order, effectively allowing the configured `max-cache-size`
limit to be significantly exceeded. This issue affects BIND 9 versions 9.11.0 through 9.16.41, 9.18.0
through 9.18.15, 9.19.0 through 9.19.13, 9.11.3-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.
(CVE-2023-2828)
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://errata.almalinux.org/8/ALSA-2023-4100.html");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
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-2023-2828");
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:"2023/06/21");
script_set_attribute(attribute:"patch_publication_date", value:"2023/07/17");
script_set_attribute(attribute:"plugin_publication_date", value:"2023/07/18");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind9.16");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind9.16-chroot");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind9.16-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind9.16-dnssec-utils");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind9.16-doc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind9.16-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind9.16-license");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:bind9.16-utils");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:python3-bind9.16");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::appstream");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::baseos");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::highavailability");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::nfv");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::powertools");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::realtime");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::resilientstorage");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::sap");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::sap_hana");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::supplementary");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Alma 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/AlmaLinux/release", "Host/AlmaLinux/rpm-list", "Host/cpu");
exit(0);
}
include('rpm.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/AlmaLinux/release');
if (isnull(os_release) || 'AlmaLinux' >!< os_release) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_ver = pregmatch(pattern: "AlmaLinux release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
os_ver = os_ver[1];
if (! preg(pattern:"^8([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'AlmaLinux 8.x', 'AlmaLinux ' + os_ver);
if (!get_kb_item('Host/AlmaLinux/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'AlmaLinux', cpu);
var pkgs = [
{'reference':'bind9.16-9.16.23-0.14.el8_8.1.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind9.16-chroot-9.16.23-0.14.el8_8.1.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind9.16-devel-9.16.23-0.14.el8_8.1.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind9.16-dnssec-utils-9.16.23-0.14.el8_8.1.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind9.16-doc-9.16.23-0.14.el8_8.1.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind9.16-libs-9.16.23-0.14.el8_8.1.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind9.16-license-9.16.23-0.14.el8_8.1.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'bind9.16-utils-9.16.23-0.14.el8_8.1.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
{'reference':'python3-bind9.16-9.16.23-0.14.el8_8.1.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'}
];
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 = 'Alma-' + 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_HOLE,
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, 'bind9.16 / bind9.16-chroot / bind9.16-devel / bind9.16-dnssec-utils / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
alma | linux | bind9.16 | p-cpe:/a:alma:linux:bind9.16 |
alma | linux | bind9.16-chroot | p-cpe:/a:alma:linux:bind9.16-chroot |
alma | linux | bind9.16-devel | p-cpe:/a:alma:linux:bind9.16-devel |
alma | linux | bind9.16-dnssec-utils | p-cpe:/a:alma:linux:bind9.16-dnssec-utils |
alma | linux | bind9.16-doc | p-cpe:/a:alma:linux:bind9.16-doc |
alma | linux | bind9.16-libs | p-cpe:/a:alma:linux:bind9.16-libs |
alma | linux | bind9.16-license | p-cpe:/a:alma:linux:bind9.16-license |
alma | linux | bind9.16-utils | p-cpe:/a:alma:linux:bind9.16-utils |
alma | linux | python3-bind9.16 | p-cpe:/a:alma:linux:python3-bind9.16 |
alma | linux | 8 | cpe:/o:alma:linux:8 |