The remote Fedora 32 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2021-6e581c051a advisory.
The iconv program in the GNU C Library (aka glibc or libc6) 2.31 and earlier, when invoked with multiple suffixes in the destination encoding (TRANSLATE or IGNORE) along with the -c option, enters an infinite loop when processing invalid multi-byte input sequences, leading to a denial of service. (CVE-2016-10228)
The iconv feature in the GNU C Library (aka glibc or libc6) through 2.32, when processing invalid multi- byte input sequences in the EUC-KR encoding, may have a buffer over-read. (CVE-2019-25013)
An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the ‘num’ parameter results in a signed comparison vulnerability. If an attacker underflows the ‘num’ parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out- of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred.
The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data. (CVE-2020-6096)
The iconv function in the GNU C Library (aka glibc or libc6) 2.30 to 2.32, when converting UCS4 text containing an irreversible character, fails an assertion in the code path and aborts the program, potentially resulting in a denial of service. (CVE-2020-29562)
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 Fedora Security Advisory FEDORA-2021-6e581c051a
#
include('compat.inc');
if (description)
{
script_id(145196);
script_version("1.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/29");
script_cve_id(
"CVE-2016-10228",
"CVE-2019-25013",
"CVE-2020-29562",
"CVE-2020-6096"
);
script_xref(name:"FEDORA", value:"2021-6e581c051a");
script_name(english:"Fedora 32 : glibc (2021-6e581c051a)");
script_set_attribute(attribute:"synopsis", value:
"The remote Fedora host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote Fedora 32 host has a package installed that is affected by multiple vulnerabilities as referenced in the
FEDORA-2021-6e581c051a advisory.
- The iconv program in the GNU C Library (aka glibc or libc6) 2.31 and earlier, when invoked with multiple
suffixes in the destination encoding (TRANSLATE or IGNORE) along with the -c option, enters an infinite
loop when processing invalid multi-byte input sequences, leading to a denial of service. (CVE-2016-10228)
- The iconv feature in the GNU C Library (aka glibc or libc6) through 2.32, when processing invalid multi-
byte input sequences in the EUC-KR encoding, may have a buffer over-read. (CVE-2019-25013)
- An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc
2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative
value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the
'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-
of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows
for program execution to continue in scenarios where a segmentation fault or crash should have occurred.
The dangers occur in that subsequent execution and iterations of this code will be executed with this
corrupted data. (CVE-2020-6096)
- The iconv function in the GNU C Library (aka glibc or libc6) 2.30 to 2.32, when converting UCS4 text
containing an irreversible character, fails an assertion in the code path and aborts the program,
potentially resulting in a denial of service. (CVE-2020-29562)
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://bodhi.fedoraproject.org/updates/FEDORA-2021-6e581c051a");
script_set_attribute(attribute:"solution", value:
"Update the affected glibc package.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/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-2020-6096");
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:"2017/03/02");
script_set_attribute(attribute:"patch_publication_date", value:"2021/01/16");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/01/20");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:32");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:glibc");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Fedora 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");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list");
exit(0);
}
include('audit.inc');
include('global_settings.inc');
include('rpm.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item('Host/RedHat/release');
if (isnull(release) || 'Fedora' >!< release) audit(AUDIT_OS_NOT, 'Fedora');
os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Fedora');
os_ver = os_ver[1];
if (! preg(pattern:"^32([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Fedora 32', 'Fedora ' + os_ver);
if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Fedora', cpu);
pkgs = [
{'reference':'glibc-2.31-5.fc32', 'release':'FC32', 'rpm_spec_vers_cmp':TRUE}
];
flag = 0;
foreach package_array ( pkgs ) {
reference = NULL;
release = NULL;
sp = NULL;
cpu = NULL;
el_string = NULL;
rpm_spec_vers_cmp = NULL;
epoch = 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['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
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'glibc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
fedoraproject | fedora | 32 | cpe:/o:fedoraproject:fedora:32 |
fedoraproject | fedora | glibc | p-cpe:/a:fedoraproject:fedora:glibc |