CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
91.8%
An update for libxml2 is now available for Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
[Updated 18 July 2016] This advisory has been updated to push packages into the Red Hat Enterprise Linux 6 Desktop channels. The packages included in this revised update have not been changed in any way from the packages included in the original advisory.
The libxml2 library is a development toolbox providing the implementation of various XML standards.
Security Fix(es) :
A heap-based buffer overflow flaw was found in the way libxml2 parsed certain crafted XML input. A remote attacker could provide a specially crafted XML file that, when opened in an application linked against libxml2, would cause the application to crash or execute arbitrary code with the permissions of the user running the application.
(CVE-2016-1834, CVE-2016-1840)
Multiple denial of service flaws were found in libxml2. A remote attacker could provide a specially crafted XML file that, when processed by an application using libxml2, could cause that application to crash. (CVE-2016-1762, CVE-2016-1833, CVE-2016-1835, CVE-2016-1836, CVE-2016-1837, CVE-2016-1838, CVE-2016-1839, CVE-2016-3627, CVE-2016-3705, CVE-2016-4447, CVE-2016-4448, CVE-2016-4449)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2016:1292. The text
# itself is copyright (C) Red Hat, Inc.
#
include("compat.inc");
if (description)
{
script_id(91802);
script_version("2.13");
script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/08");
script_cve_id("CVE-2016-1762", "CVE-2016-1833", "CVE-2016-1834", "CVE-2016-1835", "CVE-2016-1836", "CVE-2016-1837", "CVE-2016-1838", "CVE-2016-1839", "CVE-2016-1840", "CVE-2016-3627", "CVE-2016-3705", "CVE-2016-4447", "CVE-2016-4448", "CVE-2016-4449");
script_xref(name:"RHSA", value:"2016:1292");
script_name(english:"RHEL 6 / 7 : libxml2 (RHSA-2016:1292)");
script_summary(english:"Checks the rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Red Hat host is missing one or more security updates."
);
script_set_attribute(
attribute:"description",
value:
"An update for libxml2 is now available for Red Hat Enterprise Linux 6
and Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.
[Updated 18 July 2016] This advisory has been updated to push packages
into the Red Hat Enterprise Linux 6 Desktop channels. The packages
included in this revised update have not been changed in any way from
the packages included in the original advisory.
The libxml2 library is a development toolbox providing the
implementation of various XML standards.
Security Fix(es) :
A heap-based buffer overflow flaw was found in the way libxml2 parsed
certain crafted XML input. A remote attacker could provide a specially
crafted XML file that, when opened in an application linked against
libxml2, would cause the application to crash or execute arbitrary
code with the permissions of the user running the application.
(CVE-2016-1834, CVE-2016-1840)
Multiple denial of service flaws were found in libxml2. A remote
attacker could provide a specially crafted XML file that, when
processed by an application using libxml2, could cause that
application to crash. (CVE-2016-1762, CVE-2016-1833, CVE-2016-1835,
CVE-2016-1836, CVE-2016-1837, CVE-2016-1838, CVE-2016-1839,
CVE-2016-3627, CVE-2016-3705, CVE-2016-4447, CVE-2016-4448,
CVE-2016-4449)"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/errata/RHSA-2016:1292"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-1762"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-1833"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-1834"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-1835"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-1836"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-1837"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-1838"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-1839"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-1840"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-3627"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-3705"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-4447"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-4448"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2016-4449"
);
script_set_attribute(attribute:"solution", value:"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
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: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:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2-python");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2-static");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.2");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.3");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.4");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.5");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.6");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.7");
script_set_attribute(attribute:"vuln_publication_date", value:"2016/03/24");
script_set_attribute(attribute:"patch_publication_date", value:"2016/07/18");
script_set_attribute(attribute:"plugin_publication_date", value:"2016/06/24");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Red Hat Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.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) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^(6|7)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 6.x / 7.x", "Red Hat " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);
yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo))
{
rhsa = "RHSA-2016:1292";
yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
if (!empty_or_null(yum_report))
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : yum_report
);
exit(0);
}
else
{
audit_message = "affected by Red Hat security advisory " + rhsa;
audit(AUDIT_OS_NOT, audit_message);
}
}
else
{
flag = 0;
if (rpm_check(release:"RHEL6", reference:"libxml2-2.7.6-21.el6_8.1", el_string:"el6_8")) flag++;
if (rpm_check(release:"RHEL6", reference:"libxml2-debuginfo-2.7.6-21.el6_8.1", el_string:"el6_8")) flag++;
if (rpm_check(release:"RHEL6", reference:"libxml2-devel-2.7.6-21.el6_8.1", el_string:"el6_8")) flag++;
if (rpm_check(release:"RHEL6", cpu:"i686", reference:"libxml2-python-2.7.6-21.el6_8.1", el_string:"el6_8")) flag++;
if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"libxml2-python-2.7.6-21.el6_8.1", el_string:"el6_8")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"libxml2-python-2.7.6-21.el6_8.1", el_string:"el6_8")) flag++;
if (rpm_check(release:"RHEL6", cpu:"i686", reference:"libxml2-static-2.7.6-21.el6_8.1", el_string:"el6_8")) flag++;
if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"libxml2-static-2.7.6-21.el6_8.1", el_string:"el6_8")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"libxml2-static-2.7.6-21.el6_8.1", el_string:"el6_8")) flag++;
if (rpm_check(release:"RHEL7", reference:"libxml2-2.9.1-6.el7_2.3", el_string:"el7_2")) flag++;
if (rpm_check(release:"RHEL7", reference:"libxml2-debuginfo-2.9.1-6.el7_2.3", el_string:"el7_2")) flag++;
if (rpm_check(release:"RHEL7", reference:"libxml2-devel-2.9.1-6.el7_2.3", el_string:"el7_2")) flag++;
if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"libxml2-python-2.9.1-6.el7_2.3", el_string:"el7_2")) flag++;
if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"libxml2-python-2.9.1-6.el7_2.3", el_string:"el7_2")) flag++;
if (rpm_check(release:"RHEL7", reference:"libxml2-static-2.9.1-6.el7_2.3", el_string:"el7_2")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : rpm_report_get() + redhat_report_package_caveat()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libxml2 / libxml2-debuginfo / libxml2-devel / libxml2-python / etc");
}
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1762
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1833
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1834
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1835
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1836
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1837
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1838
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1839
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1840
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-3627
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-3705
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4447
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4448
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4449
access.redhat.com/errata/RHSA-2016:1292
access.redhat.com/security/cve/cve-2016-1762
access.redhat.com/security/cve/cve-2016-1833
access.redhat.com/security/cve/cve-2016-1834
access.redhat.com/security/cve/cve-2016-1835
access.redhat.com/security/cve/cve-2016-1836
access.redhat.com/security/cve/cve-2016-1837
access.redhat.com/security/cve/cve-2016-1838
access.redhat.com/security/cve/cve-2016-1839
access.redhat.com/security/cve/cve-2016-1840
access.redhat.com/security/cve/cve-2016-3627
access.redhat.com/security/cve/cve-2016-3705
access.redhat.com/security/cve/cve-2016-4447
access.redhat.com/security/cve/cve-2016-4448
access.redhat.com/security/cve/cve-2016-4449
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
91.8%