SB2015041101 - Gentoo update for Xen
Published: April 11, 2015 Updated: September 25, 2016
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 20 secuirty vulnerabilities.
1) Buffer overflow (CVE-ID: CVE-2013-2212)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The vmx_set_uc_mode function in Xen 3.3 through 4.3, when disabling caches, allows local HVM guests with access to memory mapped I/O regions to cause a denial of service (CPU consumption and possibly hypervisor or guest kernel panic) via a crafted GFN range.
2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2013-3495)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The Intel VT-d Interrupt Remapping engine in Xen 3.3.x through 4.3.x allows local guests to cause a denial of service (kernel panic) via a malformed Message Signaled Interrupt (MSI) from a PCI device that is bus mastering capable that triggers a System Error Reporting (SERR) Non-Maskable Interrupt (NMI).
3) Input validation error (CVE-ID: CVE-2014-3967)
The vulnerability allows local HVM guest administrators to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (NULL pointer dereference and crash) via unspecified vectors.
4) Input validation error (CVE-ID: CVE-2014-3968)
The vulnerability allows a remote #AU# to perform a denial of service (DoS) attack.
The HVMOP_inject_msi function in Xen 4.2.x, 4.3.x, and 4.4.x allows local guest HVM administrators to cause a denial of service (host crash) via a large number of crafted requests, which trigger an error messages to be logged.
5) Resource management error (CVE-ID: CVE-2014-5146)
The vulnerability allows a local non-authenticated attacker to perform a denial of service (DoS) attack.
Certain MMU virtualization operations in Xen 4.2.x through 4.4.x before the xsa97-hap patch, when using Hardware Assisted Paging (HAP), are not preemptible, which allows local HVM guest to cause a denial of service (vcpu consumption) by invoking these operations, which process every page assigned to a guest, a different vulnerability than CVE-2014-5149.
6) Resource management error (CVE-ID: CVE-2014-5149)
The vulnerability allows a local non-authenticated attacker to perform a denial of service (DoS) attack.
Certain MMU virtualization operations in Xen 4.2.x through 4.4.x, when using shadow pagetables, are not preemptible, which allows local HVM guest to cause a denial of service (vcpu consumption) by invoking these operations, which process every page assigned to a guest, a different vulnerability than CVE-2014-5146.
7) NULL pointer dereference (CVE-ID: CVE-2014-8594)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in arch/x86/mm.c in Xen 4.x through 4.4.x does not properly restrict updates to only PV page tables, which allows remote PV guests to cause a denial of service (NULL pointer dereference) by leveraging hardware emulation services for HVM guests using Hardware Assisted Paging (HAP). A remote attacker can perform a denial of service (DoS) attack.
8) Input validation error (CVE-ID: CVE-2014-8595)
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
arch/x86/x86_emulate/x86_emulate.c in Xen 3.2.1 through 4.4.x does not properly check privileges, which allows local HVM guest users to gain privileges or cause a denial of service (crash) via a crafted (1) CALL, (2) JMP, (3) RETF, (4) LCALL, (5) LJMP, or (6) LRET far branch instruction.
9) Input validation error (CVE-ID: CVE-2014-8866)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The compatibility mode hypercall argument translation in Xen 3.3.x through 4.4.x, when running on a 64-bit hypervisor, allows local 32-bit HVM guests to cause a denial of service (host crash) via vectors involving altering the high halves of registers while in 64-bit mode.
10) Input validation error (CVE-ID: CVE-2014-8867)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The acceleration support for the "REP MOVS" instruction in Xen 4.4.x, 3.2.x, and earlier lacks properly bounds checking for memory mapped I/O (MMIO) emulated in the hypervisor, which allows local HVM guests to cause a denial of service (host crash) via unspecified vectors.
11) Input validation error (CVE-ID: CVE-2014-9030)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The do_mmu_update function in arch/x86/mm.c in Xen 3.2.x through 4.4.x does not properly manage page references, which allows remote domains to cause a denial of service by leveraging control over an HVM guest and a crafted MMU_MACHPHYS_UPDATE.
12) Input validation error (CVE-ID: CVE-2014-9065)
The vulnerability allows a local #AU# to perform a denial of service (DoS) attack.
common/spinlock.c in Xen 4.4.x and earlier does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability to CVE-2014-9066.
13) Input validation error (CVE-ID: CVE-2014-9066)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability than CVE-2014-9065.
14) Input validation error (CVE-ID: CVE-2015-0361)
The vulnerability allows remote domains to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (system crash) via a crafted hypercall during HVM guest teardown.
15) Information disclosure (CVE-ID: CVE-2015-2044)
The vulnerability allows a local non-authenticated attacker to gain access to sensitive information.
The emulation routines for unspecified X86 devices in Xen 3.2.x through 4.5.x does not properly initialize data, which allow local HVM guest users to obtain sensitive information via vectors involving an unsupported access size.
16) Information disclosure (CVE-ID: CVE-2015-2045)
The vulnerability allows a local non-authenticated attacker to gain access to sensitive information.
The HYPERVISOR_xen_version hypercall in Xen 3.2.x through 4.5.x does not properly initialize data structures, which allows local guest users to obtain sensitive information via unspecified vectors.
17) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2015-2152)
The vulnerability allows a remote non-authenticated attacker to manipulate data.
Xen 4.5.x and earlier enables certain default backends when emulating a VGA device for an x86 HVM guest qemu even when the configuration disables them, which allows local guest users to obtain access to the VGA console by (1) setting the DISPLAY environment variable, when compiled with SDL support, or connecting to the VNC server on (2) ::1 or (3) 127.0.0.1, when not compiled with SDL support.
18) Input validation error (CVE-ID: CVE-2015-2751)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
Xen 4.3.x, 4.4.x, and 4.5.x, when using toolstack disaggregation, allows remote domains with partial management control to cause a denial of service (host lock) via unspecified domctl operations.
19) Input validation error (CVE-ID: CVE-2015-2752)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The XEN_DOMCTL_memory_mapping hypercall in Xen 3.2.x through 4.5.x, when using a PCI passthrough device, is not preemptible, which allows local x86 HVM domain users to cause a denial of service (host CPU consumption) via a crafted request to the device model (qemu-dm).
20) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2015-2756)
The vulnerability allows a local non-authenticated attacker to perform a denial of service (DoS) attack.
QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.
Remediation
Install update from vendor's website.