The remote SUSE Linux SLES12 / SLES_SAP12 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:0895-1 advisory.
An issue was discovered in lxml before 4.2.5. lxml/html/clean.py in the lxml.html.clean module does not remove javascript: URLs that use escaping, allowing a remote attacker to conduct XSS attacks, as demonstrated by j a v a s c r i p t: in Internet Explorer. This is a similar issue to CVE-2014-3146.
(CVE-2018-19787)
A XSS vulnerability was discovered in python-lxml’s clean module. The module’s parser didn’t properly imitate browsers, which caused different behaviors between the sanitizer and the user’s page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code. (CVE-2020-27783)
An XSS vulnerability was discovered in python-lxml’s clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
(CVE-2021-28957)
lxml is a library for processing XML and HTML in the Python language. Prior to version 4.6.5, the HTML Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG files embedded using data URIs. Users that employ the HTML cleaner in a security relevant context should upgrade to lxml 4.6.5 to receive a patch. There are no known workarounds available. (CVE-2021-43818)
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 70300
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# SUSE update advisory SUSE-SU-2022:0895-1. The text itself
# is copyright (C) SUSE.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(159062);
script_version("1.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/14");
script_cve_id(
"CVE-2018-19787",
"CVE-2020-27783",
"CVE-2021-28957",
"CVE-2021-43818"
);
script_xref(name:"SuSE", value:"SUSE-SU-2022:0895-1");
script_name(english:"SUSE SLES12 Security Update : python-lxml (SUSE-SU-2022:0895-1)");
script_set_attribute(attribute:"synopsis", value:
"The remote SUSE host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote SUSE Linux SLES12 / SLES_SAP12 host has a package installed that is affected by multiple vulnerabilities as
referenced in the SUSE-SU-2022:0895-1 advisory.
- An issue was discovered in lxml before 4.2.5. lxml/html/clean.py in the lxml.html.clean module does not
remove javascript: URLs that use escaping, allowing a remote attacker to conduct XSS attacks, as
demonstrated by j a v a s c r i p t: in Internet Explorer. This is a similar issue to CVE-2014-3146.
(CVE-2018-19787)
- A XSS vulnerability was discovered in python-lxml's clean module. The module's parser didn't properly
imitate browsers, which caused different behaviors between the sanitizer and the user's page. A remote
attacker could exploit this flaw to run arbitrary HTML/JS code. (CVE-2020-27783)
- An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling
the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute
allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS
code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
(CVE-2021-28957)
- lxml is a library for processing XML and HTML in the Python language. Prior to version 4.6.5, the HTML
Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG
files embedded using data URIs. Users that employ the HTML cleaner in a security relevant context should
upgrade to lxml 4.6.5 to receive a patch. There are no known workarounds available. (CVE-2021-43818)
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://bugzilla.suse.com/1118088");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1179534");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1184177");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1193752");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2018-19787");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2020-27783");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-28957");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-43818");
# https://lists.suse.com/pipermail/sle-security-updates/2022-March/010467.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9b5bf6ed");
script_set_attribute(attribute:"solution", value:
"Update the affected python-lxml 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:L/PR:N/UI:R/S:C/C:L/I:L/A:L");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-43818");
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:"2018/12/02");
script_set_attribute(attribute:"patch_publication_date", value:"2022/03/17");
script_set_attribute(attribute:"plugin_publication_date", value:"2022/03/18");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:python-lxml");
script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"SuSE Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list");
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/SuSE/release");
if (isnull(os_release) || os_release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
var os_ver = pregmatch(pattern: "^(SLE(S|D)(?:_SAP)?\d+)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'SUSE');
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES12|SLES_SAP12)$", string:os_ver)) audit(AUDIT_OS_NOT, 'SUSE SLES12 / SLES_SAP12', 'SUSE (' + os_ver + ')');
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'SUSE (' + os_ver + ')', cpu);
var service_pack = get_kb_item("Host/SuSE/patchlevel");
if (isnull(service_pack)) service_pack = "0";
if (os_ver == "SLES12" && (! preg(pattern:"^(5)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES12 SP5", os_ver + " SP" + service_pack);
if (os_ver == "SLES_SAP12" && (! preg(pattern:"^(5)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES_SAP12 SP5", os_ver + " SP" + service_pack);
var pkgs = [
{'reference':'python-lxml-3.6.1-8.5.1', 'sp':'5', 'release':'SLES_SAP12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLES_SAP-release-12.5']},
{'reference':'python-lxml-3.6.1-8.5.1', 'sp':'5', 'release':'SLES12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sles-release-12.5']}
];
var ltss_caveat_required = FALSE;
var flag = 0;
foreach var package_array ( pkgs ) {
var reference = NULL;
var _release = NULL;
var sp = NULL;
var _cpu = NULL;
var exists_check = NULL;
var rpm_spec_vers_cmp = 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['exists_check'])) exists_check = package_array['exists_check'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (reference && _release) {
if (exists_check) {
var check_flag = 0;
foreach var check (exists_check) {
if (!rpm_exists(release:_release, rpm:check)) continue;
check_flag++;
}
if (!check_flag) continue;
}
if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) 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, 'python-lxml');
}
Vendor | Product | Version |
---|---|---|
novell | suse_linux | python-lxml |
novell | suse_linux | 12 |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-19787
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27783
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28957
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43818
www.nessus.org/u?9b5bf6ed
bugzilla.suse.com/1118088
bugzilla.suse.com/1179534
bugzilla.suse.com/1184177
bugzilla.suse.com/1193752
www.suse.com/security/cve/CVE-2018-19787
www.suse.com/security/cve/CVE-2020-27783
www.suse.com/security/cve/CVE-2021-28957
www.suse.com/security/cve/CVE-2021-43818