The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2020-1190 advisory.
The xz_decomp function in xzlib.c in libxml2 2.9.1 does not properly detect compression errors, which allows context-dependent attackers to cause a denial of service (process hang) via crafted XML data.
(CVE-2015-8035)
Use-after-free vulnerability in libxml2 through 2.9.4, as used in Google Chrome before 52.0.2743.82, allows remote attackers to cause a denial of service or possibly have unspecified other impact via vectors related to the XPointer range-to function. (CVE-2016-5131)
Use after free in libxml2 before 2.9.5, as used in Google Chrome prior to 63.0.3239.84 and other products, allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (CVE-2017-15412)
The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file. (CVE-2017-18258)
A NULL pointer dereference vulnerability exists in the xpath.c:xmlXPathCompOpEval() function of libxml2 through 2.9.8 when parsing an invalid XPath expression in the XPATH_OP_AND or XPATH_OP_OR case.
Applications processing untrusted XSL format inputs with the use of the libxml2 library may be vulnerable to a denial of service attack due to a crash of the application. (CVE-2018-14404)
libxml2 2.9.8, if --with-lzma is used, allows remote attackers to cause a denial of service (infinite loop) via a crafted XML file that triggers LZMA_MEMLIMIT_ERROR, as demonstrated by xmllint, a different vulnerability than CVE-2015-8035 and CVE-2018-9251. (CVE-2018-14567)
Note that Nessus has not tested for these issues 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 Oracle Linux Security Advisory ELSA-2020-1190.
##
include('compat.inc');
if (description)
{
script_id(180731);
script_version("1.0");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/09/07");
script_cve_id(
"CVE-2015-8035",
"CVE-2016-5131",
"CVE-2017-15412",
"CVE-2017-18258",
"CVE-2018-14404",
"CVE-2018-14567"
);
script_xref(name:"IAVB", value:"2016-B-0083-S");
script_xref(name:"IAVB", value:"2016-B-0113-S");
script_xref(name:"IAVB", value:"2017-B-0169-S");
script_name(english:"Oracle Linux 7 : libxml2 (ELSA-2020-1190)");
script_set_attribute(attribute:"synopsis", value:
"The remote Oracle Linux host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ELSA-2020-1190 advisory.
- The xz_decomp function in xzlib.c in libxml2 2.9.1 does not properly detect compression errors, which
allows context-dependent attackers to cause a denial of service (process hang) via crafted XML data.
(CVE-2015-8035)
- Use-after-free vulnerability in libxml2 through 2.9.4, as used in Google Chrome before 52.0.2743.82,
allows remote attackers to cause a denial of service or possibly have unspecified other impact via vectors
related to the XPointer range-to function. (CVE-2016-5131)
- Use after free in libxml2 before 2.9.5, as used in Google Chrome prior to 63.0.3239.84 and other products,
allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (CVE-2017-15412)
- The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of
service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict
memory usage to what is required for a legitimate file. (CVE-2017-18258)
- A NULL pointer dereference vulnerability exists in the xpath.c:xmlXPathCompOpEval() function of libxml2
through 2.9.8 when parsing an invalid XPath expression in the XPATH_OP_AND or XPATH_OP_OR case.
Applications processing untrusted XSL format inputs with the use of the libxml2 library may be vulnerable
to a denial of service attack due to a crash of the application. (CVE-2018-14404)
- libxml2 2.9.8, if --with-lzma is used, allows remote attackers to cause a denial of service (infinite
loop) via a crafted XML file that triggers LZMA_MEMLIMIT_ERROR, as demonstrated by xmllint, a different
vulnerability than CVE-2015-8035 and CVE-2018-9251. (CVE-2018-14567)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/errata/ELSA-2020-1190.html");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
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:L/PR:N/UI:R/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-2017-15412");
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:"2015/11/02");
script_set_attribute(attribute:"patch_publication_date", value:"2020/04/06");
script_set_attribute(attribute:"plugin_publication_date", value:"2023/09/07");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:libxml2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:libxml2-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:libxml2-python");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:libxml2-static");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Oracle 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/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/local_checks_enabled");
exit(0);
}
include('rpm.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item('Host/OracleLinux')) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_release = get_kb_item("Host/RedHat/release");
if (isnull(os_release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:os_release)) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Oracle Linux 7', 'Oracle Linux ' + os_ver);
if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Oracle Linux', cpu);
var pkgs = [
{'reference':'libxml2-2.9.1-6.0.1.el7.4', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libxml2-devel-2.9.1-6.0.1.el7.4', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libxml2-python-2.9.1-6.0.1.el7.4', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libxml2-static-2.9.1-6.0.1.el7.4', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libxml2-2.9.1-6.0.1.el7.4', 'cpu':'i686', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libxml2-devel-2.9.1-6.0.1.el7.4', 'cpu':'i686', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libxml2-static-2.9.1-6.0.1.el7.4', 'cpu':'i686', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libxml2-2.9.1-6.0.1.el7.4', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libxml2-devel-2.9.1-6.0.1.el7.4', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libxml2-python-2.9.1-6.0.1.el7.4', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libxml2-static-2.9.1-6.0.1.el7.4', 'cpu':'x86_64', 'release':'7', '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 = 'EL' + 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) {
if (exists_check) {
if (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)) flag++;
} else {
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
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libxml2 / libxml2-devel / libxml2-python / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
oracle | linux | 7 | cpe:/o:oracle:linux:7 |
oracle | linux | libxml2 | p-cpe:/a:oracle:linux:libxml2 |
oracle | linux | libxml2-devel | p-cpe:/a:oracle:linux:libxml2-devel |
oracle | linux | libxml2-python | p-cpe:/a:oracle:linux:libxml2-python |
oracle | linux | libxml2-static | p-cpe:/a:oracle:linux:libxml2-static |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8035
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-5131
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15412
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18258
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14404
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14567
linux.oracle.com/errata/ELSA-2020-1190.html