Citrix Xen Server

An issue has been identified in both XenServer 8 and Citrix Hypervisor 8.2 CU1 LTSR which may

CVE-2024-5661 6 - Medium - June 13, 2024

An issue has been identified in both XenServer 8 and Citrix Hypervisor 8.2 CU1 LTSR which may allow a malicious administrator of a guest VM to cause the host to become slow and/or unresponsive.

An issue was discovered in Xen through 4.11.x on AMD x86 platforms, possibly

CVE-2018-19961 7.8 - High - December 08, 2018

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.

Insufficient Cleanup

An issue was discovered in Xen through 4.11.x on AMD x86 platforms, possibly

CVE-2018-19962 7.8 - High - December 08, 2018

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 small IOMMU mappings are unsafely combined into larger ones.

Information Disclosure

An issue was discovered in Xen through 4.11.x

CVE-2018-19965 5.6 - Medium - December 08, 2018

An issue was discovered in Xen through 4.11.x allowing 64-bit PV guest OS users to cause a denial of service (host OS crash) because #GP[0] can occur after a non-canonical address is passed to the TLB flushing code. NOTE: this issue exists because of an incorrect CVE-2017-5754 (aka Meltdown) mitigation.

Citrix XenServer 7.1 and newer

CVE-2018-14007 9.8 - Critical - August 15, 2018

Citrix XenServer 7.1 and newer allows Directory Traversal.

Directory traversal

A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's VNC display driver support before 2.9; the issue could occur when a VNC client attempted to update its display after a VGA operation is performed by a guest

CVE-2016-9603 9.9 - Critical - July 27, 2018

A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's VNC display driver support before 2.9; the issue could occur when a VNC client attempted to update its display after a VGA operation is performed by a guest. A privileged user/process inside a guest could use this flaw to crash the QEMU process or, potentially, execute arbitrary code on the host with privileges of the QEMU process.

Buffer Overflow

Quick emulator (QEMU) before 2.8 built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to an out-of-bounds access issue

CVE-2017-2620 9.9 - Critical - July 27, 2018

Quick emulator (QEMU) before 2.8 built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to an out-of-bounds access issue. The issue could occur while copying VGA data in cirrus_bitblt_cputovideo. A privileged user inside guest could use this flaw to crash the QEMU process OR potentially execute arbitrary code on host with privileges of the QEMU process.

Out-of-bounds Read

Quick emulator (QEMU) built with the Cirrus CLGD 54xx VGA emulator support is vulnerable to an out-of-bounds access issue

CVE-2017-2615 9.1 - Critical - July 03, 2018

Quick emulator (QEMU) built with the Cirrus CLGD 54xx VGA emulator support is vulnerable to an out-of-bounds access issue. It could occur while copying VGA data via bitblt copy in backward mode. A privileged user inside a guest could use this flaw to crash the QEMU process resulting in DoS or potentially execute arbitrary code on the host with privileges of QEMU process on the host.

Memory Corruption

System software utilizing Lazy FP state restore technique on systems using Intel Core-based microprocessors may potentially

CVE-2018-3665 5.6 - Medium - June 21, 2018

System software utilizing Lazy FP state restore technique on systems using Intel Core-based microprocessors may potentially allow a local process to infer data from another process through a speculative execution side channel.

Information Disclosure

A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in unexpected behavior for #DB exceptions

CVE-2018-8897 7.8 - High - May 08, 2018

A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS, as demonstrated by (for example) privilege escalation in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux kernel crash. The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating system at CPL < 3, the debug exception is delivered after the transfer to CPL < 3 is complete. OS kernels may not expect this order of events and may therefore experience unexpected behavior when it occurs.

Race Condition

The ntpd client in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77

CVE-2015-7704 7.5 - High - August 07, 2017

The ntpd client in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service via a number of crafted "KOD" messages.

Improper Input Validation

The rate limiting feature in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77

CVE-2015-7705 9.8 - Critical - August 07, 2017

The rate limiting feature in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to have unspecified impact via a large number of crafted requests.

Improper Input Validation

The VGA module in QEMU improperly performs bounds checking on banked access to video memory, which

CVE-2016-3710 8.8 - High - May 11, 2016

The VGA module in QEMU improperly performs bounds checking on banked access to video memory, which allows local guest OS administrators to execute arbitrary code on the host by changing access modes after setting the bank register, aka the "Dark Portal" issue.

Buffer Overflow

Integer overflow in the VGA module in QEMU

CVE-2016-3712 5.5 - Medium - May 11, 2016

Integer overflow in the VGA module in QEMU allows local guest OS users to cause a denial of service (out-of-bounds read and QEMU process crash) by editing VGA registers in VBE mode.

Integer Overflow or Wraparound

QEMU does not properly restrict write access to the PCI config space for certain PCI pass-through devices, which might

CVE-2015-4106 - June 03, 2015

QEMU does not properly restrict write access to the PCI config space for certain PCI pass-through devices, which might allow local x86 HVM guests to gain privileges, cause a denial of service (host crash), obtain sensitive information, or possibly have other unspecified impact via unknown vectors.

AuthZ