Vulnerabilities > CVE-2018-19967 - Improper Input Validation vulnerability in multiple products
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
An issue was discovered in Xen through 4.11.x on Intel x86 platforms allowing guest OS users to cause a denial of service (host OS hang) because Xen does not work around Intel's mishandling of certain HLE transactions associated with the KACQUIRE instruction prefix.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Zone Scripting An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
Nessus
NASL family Misc. NASL id CITRIX_XENSERVER_CTX239432.NASL description The version of Citrix XenServer running on the remote host is missing a security hotfix. It is, therefore, affected by multiple vulnerabilities. All of which allow a denial-of-service attack and one allowing privilege escalation as well as information disclosure. Please refer to the vendor advisory for mitigating factors. last seen 2020-06-01 modified 2020-06-02 plugin id 119148 published 2018-11-26 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119148 title Citrix XenServer Multiple Vulnerabilities (CTX239432) code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(119148); script_version("1.4"); script_cvs_date("Date: 2019/11/01"); script_cve_id( "CVE-2018-19961", "CVE-2018-19962", "CVE-2018-19965", "CVE-2018-19967" ); script_bugtraq_id(105985, 106182); script_xref(name:"IAVA", value:"2018-A-0381"); script_name(english:"Citrix XenServer Multiple Vulnerabilities (CTX239432)"); script_summary(english:"Checks for patches."); script_set_attribute(attribute:"synopsis", value: "A server virtualization platform installed on the remote host is missing a security patch."); script_set_attribute(attribute:"description", value: "The version of Citrix XenServer running on the remote host is missing a security hotfix. It is, therefore, affected by multiple vulnerabilities. All of which allow a denial-of-service attack and one allowing privilege escalation as well as information disclosure. Please refer to the vendor advisory for mitigating factors."); script_set_attribute(attribute:"see_also", value:"https://support.citrix.com/article/CTX239432"); script_set_attribute(attribute:"solution", value: "Apply the appropriate hotfix according to the vendor advisory."); script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-19961"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"vuln_publication_date", value:"2018/11/20"); script_set_attribute(attribute:"patch_publication_date", value:"2018/11/20"); script_set_attribute(attribute:"plugin_publication_date", value:"2018/11/26"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/a:citrix:xenserver"); script_set_attribute(attribute:"stig_severity", value:"I"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Misc."); script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("citrix_xenserver_version.nbin"); script_require_keys("Host/XenServer/version", "Host/local_checks_enabled"); exit(0); } include("vcf.inc"); include("vcf_extras.inc"); app_info = vcf::xenserver::get_app_info(); constraints = [ { "equal" : "7.0", "patches" : # XenServer 7.0 ["XS70E064"] }, # CTX239434 { "equal" : "7.1.1", "patches" : # XenServer 7.1 LTSR CU1 ["XS71ECU1032"] }, # CTX239435 { "equal" : "7.5", "patches" : # XenServer 7.5 ["XS75E007"] }, # CTX239436 { "equal" : "7.6", "patches" : # XenServer 7.6 ["XS76E002"] } # CTX239437 ]; vcf::xenserver::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);NASL family Debian Local Security Checks NASL id DEBIAN_DSA-4369.NASL description Multiple vulnerabilities have been discovered in the Xen hypervisor : - CVE-2018-19961 / CVE-2018-19962 Paul Durrant discovered that incorrect TLB handling could result in denial of service, privilege escalation or information leaks. - CVE-2018-19965 Matthew Daley discovered that incorrect handling of the INVPCID instruction could result in denial of service by PV guests. - CVE-2018-19966 It was discovered that a regression in the fix to address CVE-2017-15595 could result in denial of service, privilege escalation or information leaks by a PV guest. - CVE-2018-19967 It was discovered that an error in some Intel CPUs could result in denial of service by a guest instance. last seen 2020-03-17 modified 2019-01-15 plugin id 121168 published 2019-01-15 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/121168 title Debian DSA-4369-1 : xen - security update code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Debian Security Advisory DSA-4369. The text # itself is copyright (C) Software in the Public Interest, Inc. # include("compat.inc"); if (description) { script_id(121168); script_version("1.2"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/02/24"); script_cve_id("CVE-2018-19961", "CVE-2018-19962", "CVE-2018-19965", "CVE-2018-19966", "CVE-2018-19967"); script_xref(name:"DSA", value:"4369"); script_name(english:"Debian DSA-4369-1 : xen - security update"); script_summary(english:"Checks dpkg output for the updated package"); script_set_attribute( attribute:"synopsis", value:"The remote Debian host is missing a security-related update." ); script_set_attribute( attribute:"description", value: "Multiple vulnerabilities have been discovered in the Xen hypervisor : - CVE-2018-19961 / CVE-2018-19962 Paul Durrant discovered that incorrect TLB handling could result in denial of service, privilege escalation or information leaks. - CVE-2018-19965 Matthew Daley discovered that incorrect handling of the INVPCID instruction could result in denial of service by PV guests. - CVE-2018-19966 It was discovered that a regression in the fix to address CVE-2017-15595 could result in denial of service, privilege escalation or information leaks by a PV guest. - CVE-2018-19967 It was discovered that an error in some Intel CPUs could result in denial of service by a guest instance." ); script_set_attribute( attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2018-19961" ); script_set_attribute( attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2018-19962" ); script_set_attribute( attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2018-19965" ); script_set_attribute( attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2018-19966" ); script_set_attribute( attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2017-15595" ); script_set_attribute( attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2018-19967" ); script_set_attribute( attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/xen" ); script_set_attribute( attribute:"see_also", value:"https://packages.debian.org/source/stretch/xen" ); script_set_attribute( attribute:"see_also", value:"https://www.debian.org/security/2019/dsa-4369" ); script_set_attribute( attribute:"solution", value: "Upgrade the xen packages. For the stable distribution (stretch), these problems have been fixed in version 4.8.5+shim4.10.2+xsa282-1+deb9u11." ); 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_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen"); script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0"); script_set_attribute(attribute:"vuln_publication_date", value:"2018/12/08"); script_set_attribute(attribute:"patch_publication_date", value:"2019/01/14"); script_set_attribute(attribute:"plugin_publication_date", value:"2019/01/15"); script_set_attribute(attribute:"generated_plugin", value:"current"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"Debian Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l"); exit(0); } include("audit.inc"); include("debian_package.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian"); if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING); flag = 0; if (deb_check(release:"9.0", prefix:"libxen-4.8", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++; if (deb_check(release:"9.0", prefix:"libxen-dev", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++; if (deb_check(release:"9.0", prefix:"libxenstore3.0", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++; if (deb_check(release:"9.0", prefix:"xen-hypervisor-4.8-amd64", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++; if (deb_check(release:"9.0", prefix:"xen-hypervisor-4.8-arm64", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++; if (deb_check(release:"9.0", prefix:"xen-hypervisor-4.8-armhf", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++; if (deb_check(release:"9.0", prefix:"xen-system-amd64", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++; if (deb_check(release:"9.0", prefix:"xen-system-arm64", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++; if (deb_check(release:"9.0", prefix:"xen-system-armhf", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++; if (deb_check(release:"9.0", prefix:"xen-utils-4.8", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++; if (deb_check(release:"9.0", prefix:"xen-utils-common", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++; if (deb_check(release:"9.0", prefix:"xenstore-utils", reference:"4.8.5+shim4.10.2+xsa282-1+deb9u11")) flag++; if (flag) { if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get()); else security_hole(0); exit(0); } else audit(AUDIT_HOST_NOT, "affected");NASL family SuSE Local Security Checks NASL id SUSE_SU-2019-0921-1.NASL description This update for xen fixes the following issues : Security issues fixed : Fixed an issue which could allow malicious PV guests may cause a host crash or gain access to data pertaining to other guests.Additionally, vulnerable configurations are likely to be unstable even in the absence of an attack (bsc#1126198). Fixed multiple access violations introduced by XENMEM_exchange hypercall which could allow a single PV guest to leak arbitrary amounts of memory, leading to a denial of service (bsc#1126192). Fixed an issue which could allow a malicious unprivileged guest userspace process to escalate its privilege to that of other userspace processes in the same guest and potentially thereby to that of the guest operating system (bsc#1126201). Fixed an issue which could allow a malicious or buggy x86 PV guest kernels can mount a Denial of Service attack affecting the whole system (bsc#1126196). Fixed an issue which could allow an untrusted PV domain with access to a physical device to DMA into its own pagetables leading to privilege escalation (bsc#1126195). CVE-2019-6778: Fixed a heap buffer overflow in tcp_emu() found in slirp (bsc#1123157). Fixed an issue which could allow malicious 64bit PV guests to cause a host crash (bsc#1127400). Fixed an issue which could allow malicious or buggy guests with passed through PCI devices to be able to escalate their privileges, crash the host, or access data belonging to other guests. Additionally memory leaks were also possible (bsc#1126140). Fixed a race condition issue which could allow malicious PV guests to escalate their privilege to that of the hypervisor (bsc#1126141). CVE-2019-9824: Fixed an information leak in SLiRP networking implementation which could allow a user/process to read uninitialised stack memory contents (bsc#1129623). CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) Other issue addressed: Added Xen cmdline option last seen 2020-06-01 modified 2020-06-02 plugin id 123993 published 2019-04-11 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/123993 title SUSE SLES12 Security Update : xen (SUSE-SU-2019:0921-1) NASL family SuSE Local Security Checks NASL id SUSE_SU-2019-0875-1.NASL description This update for xen fixes the following issues : Security issues fixed : CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) Fixed an issue which could allow malicious PV guests may cause a host crash or gain access to data pertaining to other guests.Additionally, vulnerable configurations are likely to be unstable even in the absence of an attack (bsc#1126198). Fixed multiple access violations introduced by XENMEM_exchange hypercall which could allow a single PV guest to leak arbitrary amounts of memory, leading to a denial of service (bsc#1126192). Fixed an issue which could allow a malicious unprivileged guest userspace process to escalate its privilege to that of other userspace processes in the same guest and potentially thereby to that of the guest operating system (bsc#1126201). Fixed an issue which could allow malicious or buggy x86 PV guest kernels to mount a Denial of Service attack affecting the whole system (bsc#1126197). Fixed an issue which could allow an untrusted PV domain with access to a physical device to DMA into its own pagetables leading to privilege escalation (bsc#1126195). Fixed an issue which could allow a malicious or buggy x86 PV guest kernels can mount a Denial of Service attack affecting the whole system (bsc#1126196). Fixed an issue which could allow malicious 64bit PV guests to cause a host crash (bsc#1127400). Fixed an issue which could allow malicious or buggy guests with passed through PCI devices to be able to escalate their privileges, crash the host, or access data belonging to other guests. Additionally memory leaks were also possible (bsc#1126140). Fixed a race condition issue which could allow malicious PV guests to escalate their privilege to that of the hypervisor (bsc#1126141). Other issues fixed: Upstream bug fixes (bsc#1027519) Fixed an issue where setup of grant_tables and other variables may fail (bsc#1126325). Added a requirement for xen, xl.cfg firmware= last seen 2020-06-01 modified 2020-06-02 plugin id 123783 published 2019-04-05 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/123783 title SUSE SLED15 / SLES15 Security Update : Recommended update for xen (SUSE-SU-2019:0875-1) NASL family SuSE Local Security Checks NASL id SUSE_SU-2019-0003-1.NASL description This update for xen fixes the following issues : Update to Xen 4.11.1 bug fix release (bsc#1027519) CVE-2018-17963: Fixed an integer overflow issue in the QEMU emulator, which could occur when a packet with large packet size is processed. A user inside a guest could have used this flaw to crash the qemu process resulting in a Denial of Service (DoS). (bsc#1111014) CVE-2018-18849: Fixed an out of bounds memory access in the LSI53C895A SCSI host bus adapter emulation, which allowed a user and/or process to crash the qemu process resulting in a Denial of Service (DoS). (bsc#1114423) CVE-2018-18883: Fixed an issue related to inproper restriction of nested VT-x, which allowed a guest to cause Xen to crash, resulting in a Denial of Service (DoS). (XSA-278) (bsc#1114405) CVE-2018-19961, CVE-2018-19962: Fixed an issue related to insufficient TLB flushing with AMD IOMMUs, which potentially allowed a guest to escalate its privileges, may cause a Denial of Service (DoS) affecting the entire host, or may be able to access data it is not supposed to access. (XSA-275) (bsc#1115040) CVE-2018-19963: Fixed the allocation of pages used to communicate with external emulators, which may have cuased Xen to crash, resulting in a Denial of Service (DoS). (XSA-276) (bsc#1115043) CVE-2018-19965: Fixed an issue related to the INVPCID instruction in case non-canonical addresses are accessed, which may allow a guest to cause Xen to crash, resulting in a Denial of Service (DoS) affecting the entire host. (XSA-279) (bsc#1115045) CVE-2018-19966: Fixed an issue related to a previous fix for XSA-240, which conflicted with shadow paging and allowed a guest to cause Xen to crash, resulting in a Denial of Service (DoS) (XSA-280) (bsc#1115047) CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) CVE-2018-19964: Fixed the incorrect error handling of p2m page removals, which allowed a guest to cause a deadlock, resulting in a Denial of Service (DoS) affecting the entire host. (XSA-277) (bsc#1115044) CVE-2018-19665: Fixed an integer overflow resulting in memory corruption in various Bluetooth functions, allowing this to crash qemu process resulting in Denial of Service (DoS). (bsc#1117756). Other bugs fixed: Fixed an issue related to a domU hang on SLE12-SP3 HV (bsc#1108940) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-03-18 modified 2019-01-07 plugin id 120983 published 2019-01-07 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/120983 title SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2019:0003-1) NASL family SuSE Local Security Checks NASL id OPENSUSE-2019-1226.NASL description This update for xen fixes the following issues : Security issues fixed : - CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) - CVE-2019-6778: Fixed a heap buffer overflow in tcp_emu() found in slirp (bsc#1123157). - Fixed an issue which could allow malicious or buggy guests with passed through PCI devices to be able to escalate their privileges, crash the host, or access data belonging to other guests. Additionally memory leaks were also possible (bsc#1126140). - Fixed a race condition issue which could allow malicious PV guests to escalate their privilege to that of the hypervisor (bsc#1126141). - Fixed an issue which could allow a malicious unprivileged guest userspace process to escalate its privilege to that of other userspace processes in the same guest and potentially thereby to that of the guest operating system (bsc#1126201). - CVE-2019-9824: Fixed an information leak in SLiRP networking implementation which could allow a user/process to read uninitialised stack memory contents (bsc#1129623). - CVE-2018-19961 CVE-2018-19962: Fixed insufficient TLB flushing / improper large page mappings with AMD IOMMUs (XSA-275)(bsc#1115040). - CVE-2018-19965: Fixed denial of service issue from attempting to use INVPCID with a non-canonical addresses (XSA-279)(bsc#1115045). - CVE-2018-19966: Fixed issue introduced by XSA-240 that could have caused conflicts with shadow paging (XSA-280)(bsc#1115047). - Fixed an issue which could allow malicious PV guests may cause a host crash or gain access to data pertaining to other guests.Additionally, vulnerable configurations are likely to be unstable even in the absence of an attack (bsc#1126198). - Fixed multiple access violations introduced by XENMEM_exchange hypercall which could allow a single PV guest to leak arbitrary amounts of memory, leading to a denial of service (bsc#1126192). - Fixed an issue which could allow malicious 64bit PV guests to cause a host crash (bsc#1127400). - Fixed an issue which could allow malicious or buggy x86 PV guest kernels to mount a Denial of Service attack affecting the whole system (bsc#1126197). - Fixed an issue which could allow an untrusted PV domain with access to a physical device to DMA into its own pagetables leading to privilege escalation (bsc#1126195). - Fixed an issue which could allow a malicious or buggy x86 PV guest kernels can mount a Denial of Service attack affecting the whole system (bsc#1126196). Other issues addressed : - Upstream bug fixes (bsc#1027519) - Fixed an issue where live migrations were failing when spectre was enabled on xen boot cmdline (bsc#1116380). - Fixed an issue where setup of grant_tables and other variables may fail (bsc#1126325). - Fixed a building issue (bsc#1119161). - Fixed an issue where xpti=no-dom0 was not working as expected (bsc#1105528). - Packages should no longer use /var/adm/fillup-templates (bsc#1069468). - Added Xen cmdline option last seen 2020-06-01 modified 2020-06-02 plugin id 124147 published 2019-04-18 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/124147 title openSUSE Security Update : xen (openSUSE-2019-1226) NASL family SuSE Local Security Checks NASL id SUSE_SU-2019-0825-1.NASL description This update for xen fixes the following issues : Security issues fixed : CVE-2018-18849: Fixed an out of bounds memory access issue that was found in the LSI53C895A SCSI Host Bus Adapter emulation while writing a message in lsi_do_msgin. It could occur during migration if the last seen 2020-06-01 modified 2020-06-02 plugin id 123633 published 2019-04-02 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/123633 title SUSE SLES12 Security Update : xen (SUSE-SU-2019:0825-1) NASL family SuSE Local Security Checks NASL id OPENSUSE-2019-1199.NASL description This update for xen fixes the following issues : Security issues fixed : - CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) - Fixed an issue which could allow malicious PV guests may cause a host crash or gain access to data pertaining to other guests.Additionally, vulnerable configurations are likely to be unstable even in the absence of an attack (bsc#1126198). - Fixed multiple access violations introduced by XENMEM_exchange hypercall which could allow a single PV guest to leak arbitrary amounts of memory, leading to a denial of service (bsc#1126192). - Fixed an issue which could allow a malicious unprivileged guest userspace process to escalate its privilege to that of other userspace processes in the same guest and potentially thereby to that of the guest operating system (bsc#1126201). - Fixed an issue which could allow malicious or buggy x86 PV guest kernels to mount a Denial of Service attack affecting the whole system (bsc#1126197). - Fixed an issue which could allow an untrusted PV domain with access to a physical device to DMA into its own pagetables leading to privilege escalation (bsc#1126195). - Fixed an issue which could allow a malicious or buggy x86 PV guest kernels can mount a Denial of Service attack affecting the whole system (bsc#1126196). - Fixed an issue which could allow malicious 64bit PV guests to cause a host crash (bsc#1127400). - Fixed an issue which could allow malicious or buggy guests with passed through PCI devices to be able to escalate their privileges, crash the host, or access data belonging to other guests. Additionally memory leaks were also possible (bsc#1126140). - Fixed a race condition issue which could allow malicious PV guests to escalate their privilege to that of the hypervisor (bsc#1126141). Other issues fixed : - Upstream bug fixes (bsc#1027519) - Fixed an issue where setup of grant_tables and other variables may fail (bsc#1126325). - Added a requirement for xen, xl.cfg firmware= last seen 2020-06-01 modified 2020-06-02 plugin id 124141 published 2019-04-18 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/124141 title openSUSE Security Update : xen (openSUSE-2019-1199) NASL family Misc. NASL id XEN_SERVER_XSA-282.NASL description According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a guest-to-host denial of service vulnerability. Only Intel based x86 systems are affected. Note that Nessus has checked the changeset versions based on the xen.git change log. Nessus did not check guest hardware configurations or if patches were applied manually to the source code before a recompile and reinstall. last seen 2020-06-01 modified 2020-06-02 plugin id 119288 published 2018-11-29 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119288 title Xen Project HLE Transaction 'XACQUIRE' DoS (XSA-282) NASL family SuSE Local Security Checks NASL id SUSE_SU-2019-0827-1.NASL description This update for xen fixes the following issues : Security issues fixed : CVE-2019-6778: Fixed a heap buffer overflow in tcp_emu() found in slirp (bsc#1123157). CVE-2017-13672: Fixed an out of bounds read access during display update (bsc#1056336). Fixed an issue which could allow malicious or buggy guests with passed through PCI devices to be able to escalate their privileges, crash the host, or access data belonging to other guests. Additionally memory leaks were also possible (bsc#1126140) Fixed a race condition issue which could allow malicious PV guests to escalate their privilege to that of the hypervisor (bsc#1126141). CVE-2018-18849: Fixed an out of bounds msg buffer access which could lead to denial of service (bsc#1114423). Fixed an issue which could allow a malicious unprivileged guest userspace process to escalate its privilege to that of other userspace processes in the same guest and potentially thereby to that of the guest operating system (bsc#1126201). CVE-2018-17958: Fixed an integer overflow leading to a buffer overflow in the rtl8139 component (bsc#1111007) CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) CVE-2018-19665: Fixed an integer overflow resulting in memory corruption in various Bluetooth functions, allowing this to crash qemu process resulting in Denial of Service (DoS). (bsc#1117756). CVE-2019-9824: Fixed an information leak in SLiRP networking implementation which could allow a user/process to read uninitialised stack memory contents (bsc#1129623). CVE-2018-19961, CVE-2018-19962: Fixed an issue related to insufficient TLB flushing with AMD IOMMUs, which potentially allowed a guest to escalate its privileges, may cause a Denial of Service (DoS) affecting the entire host, or may be able to access data it is not supposed to access. (XSA-275) (bsc#1115040) CVE-2018-19966: Fixed an issue related to a previous fix for XSA-240, which conflicted with shadow paging and allowed a guest to cause Xen to crash, resulting in a Denial of Service (DoS) (XSA-280) (bsc#1115047). CVE-2018-10839: Fixed an integer overflow leading to a buffer overflow in the ne2000 component (bsc#1110924). CVE-2018-19965: Fixed an issue related to the INVPCID instruction in case non-canonical addresses are accessed, which may allow a guest to cause Xen to crash, resulting in a Denial of Service (DoS) affecting the entire host. (XSA-279) (bsc#1115045). Fixed an issue which could allow malicious 64bit PV guests to cause a host crash (bsc#1127400). Fixed an issue which could allow malicious PV guests may cause a host crash or gain access to data pertaining to other guests.Additionally, vulnerable configurations are likely to be unstable even in the absence of an attack (bsc#1126198). Fixed multiple access violations introduced by XENMEM_exchange hypercall which could allow a single PV guest to leak arbitrary amounts of memory, leading to a denial of service (bsc#1126192). CVE-2018-17963: Fixed an integer overflow in relation to large packet sizes, leading to a denial of service (DoS). (bsc#1111014). Fixed an issue which could allow a malicious or buggy x86 PV guest kernels can mount a Denial of Service attack affecting the whole system (bsc#1126196). Fixed an issue which could allow an untrusted PV domain with access to a physical device to DMA into its own pagetables leading to privilege escalation (bsc#1126195). CVE-2018-17962: Fixed an integer overflow leading to a buffer overflow in the pcnet component (bsc#1111011) CVE-2018-18438: Fixed an integer overflow in ccid_card_vscard_read function which could lead to memory corruption (bsc#1112188). Other issues fixed: Upstream bug fixes (bsc#1027519) Fixed an issue where XEN SLE12-SP1 domU hangs on SLE12-SP3 HV1108940 (bsc#1108940). Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 123634 published 2019-04-02 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/123634 title SUSE SLES12 Security Update : xen (SUSE-SU-2019:0827-1) NASL family SuSE Local Security Checks NASL id SUSE_SU-2019-13921-1.NASL description This update for xen fixes the following issues : Security vulnerabilities fixed : CVE-2018-19961, CVE-2018-19962: Fixed an issue related to insufficient TLB flushing with AMD IOMMUs, which potentially allowed a guest to escalate its privileges, may cause a Denial of Service (DoS) affecting the entire host, or may be able to access data it is not supposed to access. (XSA-275) (bsc#1115040) CVE-2018-19965: Fixed an issue related to the INVPCID instruction in case non-canonical addresses are accessed, which may allow a guest to cause Xen to crash, resulting in a Denial of Service (DoS) affecting the entire host. (XSA-279) (bsc#1115045) CVE-2018-19966: Fixed an issue related to a previous fix for XSA-240, which conflicted with shadow paging and allowed a guest to cause Xen to crash, resulting in a Denial of Service (DoS) (XSA-280) (bsc#1115047) CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988) CVE-2018-19665: Fixed an integer overflow resulting in memory corruption in various Bluetooth functions, allowing this to crash qemu process resulting in Denial of Service (DoS). (bsc#1117756). CVE-2018-18849: Fixed an out of bounds memory access in the LSI53C895A SCSI host bus adapter emulation, which allowed a user and/or process to crash the qemu process resulting in a Denial of Service (DoS). (bsc#1114423) Fixed an integer overflow in ccid_card_vscard_read(), which allowed for memory corruption. (bsc#1112188) CVE-2017-13672: Fixed an out of bounds read access during display update (bsc#1056336) CVE-2018-17958: Fixed an integer overflow leading to a buffer overflow in the rtl8139 component (bsc#1111007) CVE-2018-17962: Fixed an integer overflow leading to a buffer overflow in the pcnet component (bsc#1111011) CVE-2018-17963: Fixed an integer overflow in relation to large packet sizes, leading to a denial of service (DoS). (bsc#1111014) CVE-2018-10839: Fixed an integer overflow leading to a buffer overflow in the ne2000 component (bsc#1110924) Other bugs fixed: Fixed an issue related to a domU hang on SLE12-SP3 HV (bsc#1108940) Upstream bug fixes (bsc#1027519) Fixed crashing VMs when migrating between dom0 hosts (bsc#1031382) Fixed an issue with xpti=no-dom0 not working as expected (bsc#1105528) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-03-18 modified 2019-01-08 plugin id 121004 published 2019-01-08 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/121004 title SUSE SLES11 Security Update : xen (SUSE-SU-2019:13921-1)
References
- https://xenbits.xen.org/xsa/advisory-282.html
- http://www.securityfocus.com/bid/106182
- https://support.citrix.com/article/CTX239432
- https://www.debian.org/security/2019/dsa-4369
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00057.html
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00072.html