Описание
Security update for xen
This update for xen fixes the following issues:
Security issues fixed:
- CVE-2021-28693: xen/arm: Boot modules are not scrubbed (bsc#1186428)
- CVE-2021-28692: xen: inappropriate x86 IOMMU timeout detection / handling (bsc#1186429)
- CVE-2021-0089: xen: Speculative Code Store Bypass (bsc#1186433)
- CVE-2021-28690: xen: x86: TSX Async Abort protections not restored after S3 (bsc#1186434)
- CVE-2021-20255: Fixed stack overflow via infinite recursion in eepro100 (bsc#1182654)
- CVE-2021-28694,CVE-2021-28695,CVE-2021-28696: IOMMU page mapping issues on x86 (XSA-378)(bsc#1189373).
- CVE-2021-28697: grant table v2 status pages may remain accessible after de-allocation (XSA-379)(bsc#1189376).
- CVE-2021-28698: long running loops in grant table handling (XSA-380)(bsc#1189378).
- CVE-2021-28699: inadequate grant-v2 status frames array bounds check (XSA-382)(bsc#1189380).
- CVE-2021-28700: No memory limit for dom0less domUs (XSA-383)(bsc#1189381).
- CVE-2021-3592: slirp: invalid pointer initialization may lead to information disclosure (bootp)(bsc#1187369).
- CVE-2021-3594: slirp: invalid pointer initialization may lead to information disclosure (udp)(bsc#1187378).
- CVE-2021-3595: slirp: invalid pointer initialization may lead to information disclosure (tftp)(bsc#1187376).
Other issues fixed:
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Fixed 'Panic on CPU 0: IO-APIC + timer doesn't work!' (bsc#1180491)
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Fixed an issue with xencommons, where file format expecations by fillup did not allign (bsc#1185682)
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Upstream bug fixes (bsc#1027519)
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Dom0 hangs when pinning CPUs for dom0 with HVM guest (bsc#1179246).
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Fixed Xen SLES11SP4 guest hangs on cluster (bsc#1188050).
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Fixed PVHVM SLES12 SP5 - NMI Watchdog CPU Stuck (bsc#1180846).
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Core cannot be opened when using xl dump-core of VM with PTF (bsc#1183243)
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Prevent superpage allocation in the LAPIC and ACPI_INFO range (bsc#1189882).
Список пакетов
Image SLES12-SP5-EC2-BYOS
Image SLES12-SP5-EC2-ECS-On-Demand
Image SLES12-SP5-EC2-On-Demand
Image SLES12-SP5-EC2-SAP-BYOS
Image SLES12-SP5-EC2-SAP-On-Demand
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server for SAP Applications 12 SP5
SUSE Linux Enterprise Software Development Kit 12 SP5
Ссылки
- Link for SUSE-SU-2021:2924-1
- E-Mail link for SUSE-SU-2021:2924-1
- SUSE Security Ratings
- SUSE Bug 1027519
- SUSE Bug 1179246
- SUSE Bug 1180491
- SUSE Bug 1180846
- SUSE Bug 1182654
- SUSE Bug 1183243
- SUSE Bug 1185682
- SUSE Bug 1186428
- SUSE Bug 1186429
- SUSE Bug 1186433
- SUSE Bug 1186434
- SUSE Bug 1187369
- SUSE Bug 1187376
- SUSE Bug 1187378
- SUSE Bug 1188050
- SUSE Bug 1189373
- SUSE Bug 1189376
Описание
Observable response discrepancy in some Intel(R) Processors may allow an authorized user to potentially enable information disclosure via local access.
Затронутые продукты
Ссылки
- CVE-2021-0089
- SUSE Bug 1186433
Описание
A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator of QEMU. This issue occurs while processing controller commands due to a DMA reentry issue. This flaw allows a guest user or process to consume CPU cycles or crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Затронутые продукты
Ссылки
- CVE-2021-20255
- SUSE Bug 1182651
- SUSE Bug 1182654
Описание
x86: TSX Async Abort protections not restored after S3 This issue relates to the TSX Async Abort speculative security vulnerability. Please see https://xenbits.xen.org/xsa/advisory-305.html for details. Mitigating TAA by disabling TSX (the default and preferred option) requires selecting a non-default setting in MSR_TSX_CTRL. This setting isn't restored after S3 suspend.
Затронутые продукты
Ссылки
- CVE-2021-28690
- SUSE Bug 1186434
Описание
inappropriate x86 IOMMU timeout detection / handling IOMMUs process commands issued to them in parallel with the operation of the CPU(s) issuing such commands. In the current implementation in Xen, asynchronous notification of the completion of such commands is not used. Instead, the issuing CPU spin-waits for the completion of the most recently issued command(s). Some of these waiting loops try to apply a timeout to fail overly-slow commands. The course of action upon a perceived timeout actually being detected is inappropriate: - on Intel hardware guests which did not originally cause the timeout may be marked as crashed, - on AMD hardware higher layer callers would not be notified of the issue, making them continue as if the IOMMU operation succeeded.
Затронутые продукты
Ссылки
- CVE-2021-28692
- SUSE Bug 1186429
Описание
xen/arm: Boot modules are not scrubbed The bootloader will load boot modules (e.g. kernel, initramfs...) in a temporary area before they are copied by Xen to each domain memory. To ensure sensitive data is not leaked from the modules, Xen must "scrub" them before handing the page over to the allocator. Unfortunately, it was discovered that modules will not be scrubbed on Arm.
Затронутые продукты
Ссылки
- CVE-2021-28693
- SUSE Bug 1186428
Описание
IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn't have access to anymore (CVE-2021-28696).
Затронутые продукты
Ссылки
- CVE-2021-28694
- SUSE Bug 1189373
- SUSE Bug 1189980
Описание
IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn't have access to anymore (CVE-2021-28696).
Затронутые продукты
Ссылки
- CVE-2021-28695
- SUSE Bug 1189373
- SUSE Bug 1189980
Описание
IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn't have access to anymore (CVE-2021-28696).
Затронутые продукты
Ссылки
- CVE-2021-28696
- SUSE Bug 1189373
- SUSE Bug 1189980
Описание
grant table v2 status pages may remain accessible after de-allocation Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps re-used for other purposes.
Затронутые продукты
Ссылки
- CVE-2021-28697
- SUSE Bug 1189376
Описание
long running loops in grant table handling In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by other domains. In the process of carrying out certain actions, Xen would iterate over all such entries, including ones which aren't in use anymore and some which may have been created but never used. If the number of entries for a given domain is large enough, this iterating of the entire table may tie up a CPU for too long, starving other domains or causing issues in the hypervisor itself. Note that a domain may map its own grants, i.e. there is no need for multiple domains to be involved here. A pair of "cooperating" guests may, however, cause the effects to be more severe.
Затронутые продукты
Ссылки
- CVE-2021-28698
- SUSE Bug 1189378
Описание
inadequate grant-v2 status frames array bounds check The v2 grant table interface separates grant attributes from grant status. That is, when operating in this mode, a guest has two tables. As a result, guests also need to be able to retrieve the addresses that the new status tracking table can be accessed through. For 32-bit guests on x86, translation of requests has to occur because the interface structure layouts commonly differ between 32- and 64-bit. The translation of the request to obtain the frame numbers of the grant status table involves translating the resulting array of frame numbers. Since the space used to carry out the translation is limited, the translation layer tells the core function the capacity of the array within translation space. Unfortunately the core function then only enforces array bounds to be below 8 times the specified value, and would write past the available space if enough frame numbers needed storing.
Затронутые продукты
Ссылки
- CVE-2021-28699
- SUSE Bug 1189380
- SUSE Bug 1194306
Описание
xen/arm: No memory limit for dom0less domUs The dom0less feature allows an administrator to create multiple unprivileged domains directly from Xen. Unfortunately, the memory limit from them is not set. This allow a domain to allocate memory beyond what an administrator originally configured.
Затронутые продукты
Ссылки
- CVE-2021-28700
- SUSE Bug 1189381
Описание
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the bootp_input() function and could occur while processing a udp packet that is smaller than the size of the 'bootp_t' structure. A malicious guest could use this flaw to leak 10 bytes of uninitialized heap memory from the host. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.
Затронутые продукты
Ссылки
- CVE-2021-3592
- SUSE Bug 1187364
- SUSE Bug 1187369
Описание
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.
Затронутые продукты
Ссылки
- CVE-2021-3594
- SUSE Bug 1187367
Описание
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the tftp_input() function and could occur while processing a udp packet that is smaller than the size of the 'tftp_t' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.
Затронутые продукты
Ссылки
- CVE-2021-3595
- SUSE Bug 1187366
- SUSE Bug 1187376