CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
EPSS
Percentile
26.7%
The remote OracleVM system is missing necessary patches to address critical security updates :
x86: rate-limit logging in do_xen[oprof,pmu]_op Some of the sub-ops are acessible to all guests, and hence should be rate-limited. In the xenoprof case, just like for XSA-146, include them only in debug builds. Since the vPMU code is rather new, allow them to be always present, but downgrade them to (rate limited) guest messages. This is XSA-152. (CVE-2015-7971)
xenoprof: free domain’s vcpu array This was overlooked in fb442e2171 (‘x86_64: allow more vCPU-s per guest’).
This is XSA-151. (CVE-2015-7969)
x86: guard against undue super page PTE creation When optional super page support got added (commit bd1cd81d64 ‘x86: PV support for hugepages’), two adjustments were missed: mod_l2_entry needs to consider the PSE and RW bits when deciding whether to use the fast path, and the PSE bit must not be removed from L2_DISALLOW_MASK unconditionally. This is XSA-148.
[backport to Xen 4.1] (CVE-2015-7835)
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The package checks in this plugin were extracted from OracleVM
# Security Advisory OVMSA-2015-0143.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(86802);
script_version("2.6");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");
script_cve_id("CVE-2015-7835", "CVE-2015-7969", "CVE-2015-7971");
script_name(english:"OracleVM 3.2 : xen (OVMSA-2015-0143)");
script_summary(english:"Checks the RPM output for the updated packages.");
script_set_attribute(
attribute:"synopsis",
value:"The remote OracleVM host is missing one or more security updates."
);
script_set_attribute(
attribute:"description",
value:
"The remote OracleVM system is missing necessary patches to address
critical security updates :
- x86: rate-limit logging in do_xen[oprof,pmu]_op Some of
the sub-ops are acessible to all guests, and hence
should be rate-limited. In the xenoprof case, just like
for XSA-146, include them only in debug builds. Since
the vPMU code is rather new, allow them to be always
present, but downgrade them to (rate limited) guest
messages. This is XSA-152. (CVE-2015-7971)
- xenoprof: free domain's vcpu array This was overlooked
in fb442e2171 ('x86_64: allow more vCPU-s per guest').
This is XSA-151. (CVE-2015-7969)
- x86: guard against undue super page PTE creation When
optional super page support got added (commit bd1cd81d64
'x86: PV support for hugepages'), two adjustments were
missed: mod_l2_entry needs to consider the PSE and RW
bits when deciding whether to use the fast path, and the
PSE bit must not be removed from L2_DISALLOW_MASK
unconditionally. This is XSA-148.
[backport to Xen 4.1] (CVE-2015-7835)"
);
# https://oss.oracle.com/pipermail/oraclevm-errata/2015-November/000393.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?4eaa61d7"
);
script_set_attribute(
attribute:"solution",
value:"Update the affected xen / xen-devel / xen-tools packages."
);
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:vm:xen");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:vm:xen-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:vm:xen-tools");
script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:vm_server:3.2");
script_set_attribute(attribute:"vuln_publication_date", value:"2015/10/30");
script_set_attribute(attribute:"patch_publication_date", value:"2015/11/06");
script_set_attribute(attribute:"plugin_publication_date", value:"2015/11/09");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2015-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"OracleVM Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/OracleVM/release", "Host/OracleVM/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/OracleVM/release");
if (isnull(release) || "OVS" >!< release) audit(AUDIT_OS_NOT, "OracleVM");
if (! preg(pattern:"^OVS" + "3\.2" + "(\.[0-9]|$)", string:release)) audit(AUDIT_OS_NOT, "OracleVM 3.2", "OracleVM " + release);
if (!get_kb_item("Host/OracleVM/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "OracleVM", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);
flag = 0;
if (rpm_check(release:"OVS3.2", reference:"xen-4.1.3-25.el5.209.4")) flag++;
if (rpm_check(release:"OVS3.2", reference:"xen-devel-4.1.3-25.el5.209.4")) flag++;
if (rpm_check(release:"OVS3.2", reference:"xen-tools-4.1.3-25.el5.209.4")) flag++;
if (flag)
{
if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
else security_hole(0);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "xen / xen-devel / xen-tools");
}