Описание
Security update for xen
This update for xen fixes the following issues:
- CVE-2021-0089: Fixed Speculative Code Store Bypass (XSA-375) (bsc#1186433).
- CVE-2021-20255: Fixed stack overflow via infinite recursion in eepro100 (bsc#1182654).
- CVE-2021-28690: Fixed x86 TSX Async Abort protections not restored after S3 (XSA-377) (bsc#1186434).
- CVE-2021-28692: Fixed inappropriate x86 IOMMU timeout detection / handling (XSA-373) (bsc#1186429).
- CVE-2021-28697: Fixed grant table v2 status pages may remain accessible after de-allocation (XSA-379) (bsc#1189376).
- CVE-2021-28698: Fixed long running loops in grant table handling. (XSA-380) (bsc#1189378).
- CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
- CVE-2021-28703: Fixed grant table v2 status pages may remain accessible after de-allocation (take two) (XSA-387) (bsc#1192555).
- CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389) (bsc#1192559).
- CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).
- CVE-2021-3527: Fixed unbounded stack allocation in usbredir (bsc#1186013).
- CVE-2021-3592: Fixed invalid pointer initialization may lead to information disclosure in slirp (bootp) (bsc#1187369).
- CVE-2021-3594: Fixed invalid pointer initialization may lead to information disclosure in slirp (udp) (bsc#1187378).
- CVE-2021-3595: Fixed invalid pointer initialization may lead to information disclosure in slirp (tftp) (bsc#1187376).
- CVE-2021-3682: Fixed free call on invalid pointer in usbredir bufp_alloc (bsc#1189150).
- CVE-2021-3930: Fixed off-by-one error in mode_sense_page() in hw/scsi/scsi-disk.c (bsc#1192526).
Список пакетов
SUSE Linux Enterprise Server 11 SP4-LTSS
Ссылки
- Link for SUSE-SU-2021:14848-1
- E-Mail link for SUSE-SU-2021:14848-1
- SUSE Security Ratings
- SUSE Bug 1182654
- SUSE Bug 1186013
- SUSE Bug 1186429
- SUSE Bug 1186433
- SUSE Bug 1186434
- SUSE Bug 1187369
- SUSE Bug 1187376
- SUSE Bug 1187378
- SUSE Bug 1189150
- SUSE Bug 1189376
- SUSE Bug 1189378
- SUSE Bug 1189632
- SUSE Bug 1192526
- SUSE Bug 1192554
- SUSE Bug 1192555
- SUSE Bug 1192559
- SUSE CVE CVE-2021-0089 page
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
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
Another race in XENMAPSPACE_grant_table handling Guests are 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, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.
Затронутые продукты
Ссылки
- CVE-2021-28701
- SUSE Bug 1189632
Описание
grant table v2 status pages may remain accessible after de-allocation (take two) 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. This bug was fortuitously fixed by code cleanup in Xen 4.14, and backported to security-supported Xen branches as a prerequisite of the fix for XSA-378.
Затронутые продукты
Ссылки
- CVE-2021-28703
- SUSE Bug 1192555
Описание
issues with partially successful P2M updates on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). In some cases the hypervisor carries out the requests by splitting them into smaller chunks. Error handling in certain PoD cases has been insufficient in that in particular partial success of some operations was not properly accounted for. There are two code paths affected - page removal (CVE-2021-28705) and insertion of new pages (CVE-2021-28709). (We provide one patch which combines the fix to both issues.)
Затронутые продукты
Ссылки
- CVE-2021-28705
- SUSE Bug 1192559
Описание
guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It would then only be the overflowed (and hence small) number which gets compared against the established upper bound.
Затронутые продукты
Ссылки
- CVE-2021-28706
- SUSE Bug 1192554
Описание
issues with partially successful P2M updates on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). In some cases the hypervisor carries out the requests by splitting them into smaller chunks. Error handling in certain PoD cases has been insufficient in that in particular partial success of some operations was not properly accounted for. There are two code paths affected - page removal (CVE-2021-28705) and insertion of new pages (CVE-2021-28709). (We provide one patch which combines the fix to both issues.)
Затронутые продукты
Ссылки
- CVE-2021-28709
Описание
A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service.
Затронутые продукты
Ссылки
- CVE-2021-3527
- SUSE Bug 1186012
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
Описание
A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2. It occurs when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata, resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the host.
Затронутые продукты
Ссылки
- CVE-2021-3682
- SUSE Bug 1189145
Описание
An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.
Затронутые продукты
Ссылки
- CVE-2021-3930
- SUSE Bug 1192525
- SUSE Bug 1192526