Multiple vulnerabilities have been discovered in the Xen hypervisor, which could result in denial of service, informations leaks or privilege escalation. For Debian 8 'Jessie', these problems have been fixed in version 4.4.4lts5-0+deb8u1.

We recommend that you upgrade your xen packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for xen fixes the following issues :

Security issues fixed :

  - CVE-2018-18849: Fixed an out of bounds memory access     issue was found in the LSI53C895A SCSI Host Bus Adapter     emulation while writing a message in lsi_do_msgin     (bsc#1114423).

  - CVE-2018-18883: Fixed a NULL pointer dereference that     could have been triggered by nested VT-x that where not     properly restricted (XSA-278)(bsc#1114405).

  - 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).

  - CVE-2018-19961 CVE-2018-19962: Fixed insufficient TLB     flushing / improper large page mappings with AMD IOMMUs     (XSA-275)(bsc#1115040).

Non-security issues fixed :

  - Added upstream bug fixes (bsc#1027519).

This update was imported from the SUSE:SLE-12-SP3:Update update project.

This update for xen fixes the following issues :

Update to Xen 4.10.2 bug fix release (bsc#1027519).

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-2018-18883: 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-2018-15468: Fixed incorrect MSR_DEBUGCTL handling,     which allowed guests to enable Branch Trace Store and     may cause a Denial of Service (DoS) of the entire host.
    (XSA-269) (bsc#1103276)

  - CVE-2018-15469: Fixed use of v2 grant tables on ARM,     which were not properly implemented and may cause a     Denial of Service (DoS). (XSA-268) (bsc#1103275)

  - CVE-2018-15470: Fixed an issue in the logic in     oxenstored for handling writes, which allowed a guest to     write memory unbounded leading to system-wide Denial of     Service (DoS). (XSA-272) (bsc#1103279)

  - CVE-2018-3646: Mitigations for VMM aspects of L1     Terminal Fault (XSA-273) (bsc#1091107)

Other bugs fixed :

  - Fixed an issue related to a domU hang on SLE12-SP3 HV     (bsc#1108940)

  - Fixed an issue with xpti=no-dom0 not working as expected     (bsc#1105528)

  - Fixed a kernel oops related to fs/dcache.c called by     d_materialise_unique() (bsc#1094508)

This update was imported from the SUSE:SLE-15:Update update project.

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.

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a vulnerability allowing a guest system to potentially elevate privileges, access protected information, and perform a DoS against the host. Only AMD systems with IOMMU enabled 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.

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.

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.

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 'suse_vtsc_tolerance' to avoid     TSC emulation for HVM domUs (bsc#1026236).

This update was imported from the SUSE:SLE-12-SP3:Update update project.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An issue was discovered in Xen through 4.11.x on AMD x86 platforms, possibly allowing guest OS users to     gain host OS privileges because TLB flushes do not always occur after IOMMU mapping changes.
    (CVE-2018-19961)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Published	Updated	Severity
129734	Debian DLA-1949-1 : xen security update	Nessus	Debian Local Security Checks	10/9/2019	4/19/2024	high
119642	openSUSE Security Update : xen (openSUSE-2018-1530)	Nessus	SuSE Local Security Checks	12/13/2018	7/16/2024	high
119951	openSUSE Security Update : xen (openSUSE-2018-1624) (Foreshadow)	Nessus	SuSE Local Security Checks	12/31/2018	7/12/2024	high
123167	openSUSE Security Update : xen (openSUSE-2019-1046) (Foreshadow)	Nessus	SuSE Local Security Checks	3/27/2019	6/12/2024	high
119148	Citrix XenServer Multiple Vulnerabilities (CTX239432)	Nessus	Misc.	11/26/2018	6/2/2025	high
119656	Xen Project Insufficient TLB Flushing Vulnerability (XSA-275)	Nessus	Misc.	12/13/2018	3/21/2025	high
121004	SUSE SLES11 Security Update : xen (SUSE-SU-2019:13921-1)	Nessus	SuSE Local Security Checks	1/8/2019	6/27/2024	critical
121168	Debian DSA-4369-1 : xen - security update	Nessus	Debian Local Security Checks	1/15/2019	4/16/2025	high
124147	openSUSE Security Update : xen (openSUSE-2019-1226)	Nessus	SuSE Local Security Checks	4/18/2019	5/31/2024	high
222220	Linux Distros Unpatched Vulnerability : CVE-2018-19961	Nessus	Misc.	3/4/2025	7/29/2026	high

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