revised patch for XSA-286 (mitigating performance impact)

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x86 PV guest INVLPG-like flushes may leave stale TLB entries [XSA-286, CVE-2020-27674] (#1891092)

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x86: Race condition in Xen mapping code [XSA-345] undue deferral of IOMMU TLB flushes [XSA-346] unsafe AMD IOMMU page table updates [XSA-347]

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
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 :

bsc#1178963 - stack corruption from XSA-346 change (XSA-355)

bsc#1177409 - CVE-2020-27674: x86 PV guest INVLPG-like flushes may leave stale TLB entries (XSA-286)

bsc#1177412 - CVE-2020-27672: Race condition in Xen mapping code (XSA-345)

bsc#1177413 - CVE-2020-27671: undue deferral of IOMMU TLB flushes (XSA-346)

bsc#1177414 - CVE-2020-27670: unsafe AMD IOMMU page table updates (XSA-347)

bsc#1178591 - CVE-2020-28368: Intel RAPL sidechannel attack aka PLATYPUS attack aka XSA-351

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.

This update for xen fixes the following issues :

bsc#1177409 - VUL-0: CVE-2020-27673: xen: x86 PV guest INVLPG-like flushes may leave stale TLB entries (XSA-286)

bsc#1177412 - VUL-0: CVE-2020-27672: xen: Race condition in Xen mapping code (XSA-345)

bsc#1177413 - VUL-0: CVE-2020-27671: xen: undue deferral of IOMMU TLB flushes (XSA-346)

bsc#1177414 - VUL-0: CVE-2020-27670: xen: unsafe AMD IOMMU page table updates (XSA-347)

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.

This update for xen fixes the following issues :

bsc#1178963 - VUL-0: xen: stack corruption from XSA-346 change (XSA-355)

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.

The remote SUSE Linux SLES11 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2020:14557-1 advisory.

  - A reachable assertion issue was found in the USB EHCI emulation code of QEMU. It could occur while     processing USB requests due to missing handling of DMA memory map failure. A malicious privileged user     within the guest may abuse this flaw to send bogus USB requests and crash the QEMU process on the host,     resulting in a denial of service. (CVE-2020-25723)

  - An issue was discovered in Xen through 4.14.x allowing x86 guest OS users to cause a denial of service     (data corruption), cause a data leak, or possibly gain privileges because an AMD IOMMU page-table entry     can be half-updated. (CVE-2020-27670)

  - An issue was discovered in Xen through 4.14.x allowing x86 HVM and PVH guest OS users to cause a denial of     service (data corruption), cause a data leak, or possibly gain privileges because coalescing of per-page     IOMMU TLB flushes is mishandled. (CVE-2020-27671)

  - An issue was discovered in Xen through 4.14.x allowing x86 guest OS users to cause a host OS denial of     service, achieve data corruption, or possibly gain privileges by exploiting a race condition that leads to     a use-after-free involving 2MiB and 1GiB superpages. (CVE-2020-27672)

  - An issue was discovered in Xen through 4.14.x allowing x86 PV guest OS users to gain guest OS privileges     by modifying kernel memory contents, because invalidation of TLB entries is mishandled during use of an     INVLPG-like attack technique. (CVE-2020-27674)

  - Xen through 4.14.x allows guest OS administrators to obtain sensitive information (such as AES keys from     outside the guest) via a side-channel attack on a power/energy monitoring interface, aka a Platypus     attack. NOTE: there is only one logically independent fix: to change the access control for each such     interface in Xen. (CVE-2020-28368)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
143135	Fedora 31 : xen (2020-6dd36a716c)	Nessus	Fedora Local Security Checks	2020/11/20	2024/2/8	high
144102	SUSE SLES12 Security Update : xen (SUSE-SU-2020:3742-1)	Nessus	SuSE Local Security Checks	2020/12/11	2022/5/11	high
143811	SUSE SLED15 / SLES15 Security Update : xen (SUSE-SU-2020:3051-1)	Nessus	SuSE Local Security Checks	2020/12/9	2022/5/11	high
143878	SUSE SLED15 / SLES15 Security Update : xen (SUSE-SU-2020:3615-1)	Nessus	SuSE Local Security Checks	2020/12/9	2022/5/11	high
150513	SUSE SLES11 Security Update : xen (SUSE-SU-2020:14557-1)	Nessus	SuSE Local Security Checks	2021/6/10	2024/12/19	high

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