Vulnerabilities > CVE-2017-10916 - Information Exposure vulnerability in XEN
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
NONE Availability impact
NONE Summary
The vCPU context-switch implementation in Xen through 4.8.x improperly interacts with the Memory Protection Extensions (MPX) and Protection Key (PKU) features, which makes it easier for guest OS users to defeat ASLR and other protection mechanisms, aka XSA-220.
Vulnerable Configurations
Part | Description | Count |
---|---|---|
OS | 13 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Subverting Environment Variable Values The attacker directly or indirectly modifies environment variables used by or controlling the target software. The attacker's goal is to cause the target software to deviate from its expected operation in a manner that benefits the attacker.
- Footprinting An attacker engages in probing and exploration activity to identify constituents and properties of the target. Footprinting is a general term to describe a variety of information gathering techniques, often used by attackers in preparation for some attack. It consists of using tools to learn as much as possible about the composition, configuration, and security mechanisms of the targeted application, system or network. Information that might be collected during a footprinting effort could include open ports, applications and their versions, network topology, and similar information. While footprinting is not intended to be damaging (although certain activities, such as network scans, can sometimes cause disruptions to vulnerable applications inadvertently) it may often pave the way for more damaging attacks.
- Exploiting Trust in Client (aka Make the Client Invisible) An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
- Browser Fingerprinting An attacker carefully crafts small snippets of Java Script to efficiently detect the type of browser the potential victim is using. Many web-based attacks need prior knowledge of the web browser including the version of browser to ensure successful exploitation of a vulnerability. Having this knowledge allows an attacker to target the victim with attacks that specifically exploit known or zero day weaknesses in the type and version of the browser used by the victim. Automating this process via Java Script as a part of the same delivery system used to exploit the browser is considered more efficient as the attacker can supply a browser fingerprinting method and integrate it with exploit code, all contained in Java Script and in response to the same web page request by the browser.
- Session Credential Falsification through Prediction This attack targets predictable session ID in order to gain privileges. The attacker can predict the session ID used during a transaction to perform spoofing and session hijacking.
Nessus
NASL family Fedora Local Security Checks NASL id FEDORA_2017-C3149B5FCB.NASL description xen: various flaws (#1463247) blkif responses leak backend stack data [XSA-216] page transfer may allow PV guest to elevate privilege [XSA-217] Races in the grant table unmap code [XSA-218] x86: insufficient reference counts during shadow emulation [XSA-219] x86: PKRU and BND* leakage between vCPU-s [XSA-220] stale P2M mappings due to insufficient error checking [XSA-222] ARM guest disabling interrupt may crash Xen [XSA-223] grant table operations mishandle reference counts [XSA-224] arm: vgic: Out-of-bound access when sending SGIs [XSA-225] NULL pointer deref in event channel poll [XSA-221] (#1463231) Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2017-06-23 plugin id 101028 published 2017-06-23 reporter This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/101028 title Fedora 25 : xen (2017-c3149b5fcb) code #%NASL_MIN_LEVEL 80502 # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Fedora Security Advisory FEDORA-2017-c3149b5fcb. # include("compat.inc"); if (description) { script_id(101028); script_version("1.7"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04"); script_cve_id("CVE-2017-10911", "CVE-2017-10912", "CVE-2017-10913", "CVE-2017-10915", "CVE-2017-10916", "CVE-2017-10917", "CVE-2017-10918", "CVE-2017-10919", "CVE-2017-10920", "CVE-2017-10923"); script_xref(name:"FEDORA", value:"2017-c3149b5fcb"); script_xref(name:"IAVB", value:"2017-B-0074"); script_name(english:"Fedora 25 : xen (2017-c3149b5fcb)"); script_summary(english:"Checks rpm output for the updated package."); script_set_attribute( attribute:"synopsis", value:"The remote Fedora host is missing a security update." ); script_set_attribute( attribute:"description", value: "xen: various flaws (#1463247) blkif responses leak backend stack data [XSA-216] page transfer may allow PV guest to elevate privilege [XSA-217] Races in the grant table unmap code [XSA-218] x86: insufficient reference counts during shadow emulation [XSA-219] x86: PKRU and BND* leakage between vCPU-s [XSA-220] stale P2M mappings due to insufficient error checking [XSA-222] ARM guest disabling interrupt may crash Xen [XSA-223] grant table operations mishandle reference counts [XSA-224] arm: vgic: Out-of-bound access when sending SGIs [XSA-225] NULL pointer deref in event channel poll [XSA-221] (#1463231) Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues." ); script_set_attribute( attribute:"see_also", value:"https://bodhi.fedoraproject.org/updates/FEDORA-2017-c3149b5fcb" ); script_set_attribute(attribute:"solution", value:"Update the affected xen package."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:xen"); script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:25"); script_set_attribute(attribute:"vuln_publication_date", value:"2017/07/05"); script_set_attribute(attribute:"patch_publication_date", value:"2017/07/11"); script_set_attribute(attribute:"plugin_publication_date", value:"2017/06/23"); 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_copyright(english:"This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"Fedora Local Security Checks"); 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:"^25([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 25", "Fedora " + os_ver); if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item("Host/cpu"); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu); flag = 0; if (rpm_check(release:"FC25", reference:"xen-4.7.2-7.fc25")) flag++; if (flag) { security_report_v4( port : 0, severity : SECURITY_HOLE, 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, "xen"); }
NASL family Debian Local Security Checks NASL id DEBIAN_DSA-3969.NASL description Multiple vulnerabilities have been discovered in the Xen hypervisor : - CVE-2017-10912 Jann Horn discovered that incorrectly handling of page transfers might result in privilege escalation. - CVE-2017-10913 / CVE-2017-10914 Jann Horn discovered that race conditions in grant handling might result in information leaks or privilege escalation. - CVE-2017-10915 Andrew Cooper discovered that incorrect reference counting with shadow paging might result in privilege escalation. - CVE-2017-10916 Andrew Cooper discovered an information leak in the handling of the Memory Protection Extensions (MPX) and Protection Key (PKU) CPU features. This only affects Debian stretch. - CVE-2017-10917 Ankur Arora discovered a NULL pointer dereference in event polling, resulting in denial of service. - CVE-2017-10918 Julien Grall discovered that incorrect error handling in physical-to-machine memory mappings may result in privilege escalation, denial of service or an information leak. - CVE-2017-10919 Julien Grall discovered that incorrect handling of virtual interrupt injection on ARM systems may result in denial of service. - CVE-2017-10920 / CVE-2017-10921 / CVE-2017-10922 Jan Beulich discovered multiple places where reference counting on grant table operations was incorrect, resulting in potential privilege escalation. - CVE-2017-12135 Jan Beulich found multiple problems in the handling of transitive grants which could result in denial of service and potentially privilege escalation. - CVE-2017-12136 Ian Jackson discovered that race conditions in the allocator for grant mappings may result in denial of service or privilege escalation. This only affects Debian stretch. - CVE-2017-12137 Andrew Cooper discovered that incorrect validation of grants may result in privilege escalation. - CVE-2017-12855 Jan Beulich discovered that incorrect grant status handling, thus incorrectly informing the guest that the grant is no longer in use. - XSA-235 (no CVE yet) Wei Liu discovered that incorrect locking of add-to-physmap operations on ARM may result in denial of service. last seen 2020-06-01 modified 2020-06-02 plugin id 103146 published 2017-09-13 reporter This script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/103146 title Debian DSA-3969-1 : xen - security update NASL family SuSE Local Security Checks NASL id SUSE_SU-2017-1812-1.NASL description This update for xen fixes several issues. These security issues were fixed : - CVE-2017-10911: blkif responses leaked backend stack data, which allowed unprivileged guest to obtain sensitive information from the host or other guests (XSA-216, bsc#1042863) - CVE-2017-10912: Page transfer might have allowed PV guest to elevate privilege (XSA-217, bsc#1042882) - CVE-2017-10913, CVE-2017-10914: Races in the grant table unmap code allowed for informations leaks and potentially privilege escalation (XSA-218, bsc#1042893) - CVE-2017-10915: Insufficient reference counts during shadow emulation allowed a malicious pair of guest to elevate their privileges to the privileges that XEN runs under (XSA-219, bsc#1042915) - CVE-2017-10917: Missing NULL pointer check in event channel poll allows guests to DoS the host (XSA-221, bsc#1042924) - CVE-2017-10918: Stale P2M mappings due to insufficient error checking allowed malicious guest to leak information or elevate privileges (XSA-222, bsc#1042931) - CVE-2017-10922, CVE-2017-10921, CVE-2017-10920: Grant table operations mishandled reference counts allowing malicious guests to escape (XSA-224, bsc#1042938) - CVE-2017-10916: PKRU and BND* leakage between vCPU-s might have leaked information to other guests (XSA-220, bsc#1042923) - CVE-2017-9330: USB OHCI Emulation in qemu allowed local guest OS users to cause a denial of service (infinite loop) by leveraging an incorrect return value (bsc#1042160) - CVE-2017-8309: Memory leak in the audio/audio.c allowed remote attackers to cause a denial of service (memory consumption) by repeatedly starting and stopping audio capture (bsc#1037243) - CVE-2017-8112: hw/scsi/vmw_pvscsi.c allowed local guest OS privileged users to cause a denial of service (infinite loop and CPU consumption) via the message ring page count (bsc#1036470) - CVE-2017-8905: Xen a failsafe callback, which might have allowed PV guest OS users to execute arbitrary code on the host OS (XSA-215, bsc#1034845). - CVE-2017-9503: The MegaRAID SAS 8708EM2 Host Bus Adapter emulation support was vulnerable to a NULL pointer dereference issue which allowed a privileged user inside guest to crash the Qemu process on the host resulting in DoS (bsc#1043297) - CVE-2017-9374: Missing free of last seen 2020-06-01 modified 2020-06-02 plugin id 101350 published 2017-07-10 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/101350 title SUSE SLES12 Security Update : xen (SUSE-SU-2017:1812-1) NASL family Fedora Local Security Checks NASL id FEDORA_2017-5C6A9B07A3.NASL description xen: various flaws (#1463247) blkif responses leak backend stack data [XSA-216] page transfer may allow PV guest to elevate privilege [XSA-217] Races in the grant table unmap code [XSA-218] x86: insufficient reference counts during shadow emulation [XSA-219] x86: PKRU and BND* leakage between vCPU-s [XSA-220] NULL pointer deref in event channel poll [XSA-221] (#1463231) stale P2M mappings due to insufficient error checking [XSA-222] ARM guest disabling interrupt may crash Xen [XSA-223] grant table operations mishandle reference counts [XSA-224] arm: vgic: Out-of-bound access when sending SGIs [XSA-225] Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2017-07-17 plugin id 101638 published 2017-07-17 reporter This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/101638 title Fedora 26 : xen (2017-5c6a9b07a3) NASL family Fedora Local Security Checks NASL id FEDORA_2017-B3BDAF58BC.NASL description xen: various flaws (#1463247) blkif responses leak backend stack data [XSA-216] page transfer may allow PV guest to elevate privilege [XSA-217] Races in the grant table unmap code [XSA-218] x86: insufficient reference counts during shadow emulation [XSA-219] x86: PKRU and BND* leakage between vCPU-s [XSA-220] stale P2M mappings due to insufficient error checking [XSA-222] ARM guest disabling interrupt may crash Xen [XSA-223] grant table operations mishandle reference counts [XSA-224] arm: vgic: Out-of-bound access when sending SGIs [XSA-225] NULL pointer deref in event channel poll [XSA-221] (#1463231) Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2017-07-03 plugin id 101183 published 2017-07-03 reporter This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/101183 title Fedora 24 : xen (2017-b3bdaf58bc)