This update for xen fixes the following issues :

CVE-2020-25602: Fixed an issue where there was a crash when handling guest access to MSR_MISC_ENABLE was thrown (bsc#1176339,XSA-333)

CVE-2020-25598: Added a missing unlock in XENMEM_acquire_resource error path (bsc#1176341,XSA-334)

CVE-2020-25604: Fixed a race condition when migrating timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)

CVE-2020-25595: Fixed an issue where PCI passthrough code was reading back hardware registers (bsc#1176344,XSA-337)

CVE-2020-25597: Fixed an issue where a valid event channels may not turn invalid (bsc#1176346,XSA-338)

CVE-2020-25596: Fixed a potential denial of service in x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)

CVE-2020-25603: Fixed an issue due to missing barriers when accessing/allocating an event channel (bsc#1176347,XSA-340)

CVE-2020-25600: Fixed out of bounds event channels available to 32-bit x86 domains (bsc#1176348,XSA-342)

CVE-2020-25599: Fixed race conditions with evtchn_reset() (bsc#1176349,XSA-343)

CVE-2020-25601: Fixed an issue due to lack of preemption in evtchn_reset() / evtchn_destroy() (bsc#1176350,XSA-344)

CVE-2020-14364: Fixed an out-of-bounds read/write access while processing usb packets (bsc#1175534).

Various bug fixes (bsc#1027519)

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.

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a denial of service (DoS) vulnerability. Code paths in Xen's MSI handling have been identified which act on unsanitized values read back from device hardware registers.  While devices strictly compliant with PCI specifications shouldn't be able to affect these registers, experience shows that it's very common for devices to have out-of-spec 'backdoor' operations which can affect the result of these reads. A not fully trusted guest may be able to crash Xen, leading to a Denial of Service for the entire system.  Privilege escalation and information leaks cannot be excluded.

Only systems passing through devices with out-of-spec (backdoor) functionality can cause issues.  Experience shows that such out-of-spec functionality is common; unless you have reason to believe that your device does not have such functionality, it's better to assume that it does.

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

This update for xen fixes the following issues :

  - CVE-2020-25602: Fixed an issue where there was a crash     when handling guest access to MSR_MISC_ENABLE was thrown     (bsc#1176339,XSA-333)

  - CVE-2020-25598: Added a missing unlock in     XENMEM_acquire_resource error path (bsc#1176341,XSA-334)

  - CVE-2020-25604: Fixed a race condition when migrating     timers between x86 HVM vCPU-s (bsc#1176343,XSA-336)

  - CVE-2020-25595: Fixed an issue where PCI passthrough     code was reading back hardware registers     (bsc#1176344,XSA-337)

  - CVE-2020-25597: Fixed an issue where a valid event     channels may not turn invalid (bsc#1176346,XSA-338)

  - CVE-2020-25596: Fixed a potential denial of service in     x86 pv guest kernel via SYSENTER (bsc#1176345,XSA-339)

  - CVE-2020-25603: Fixed an issue due to missing barriers     when accessing/allocating an event channel     (bsc#1176347,XSA-340)

  - CVE-2020-25600: Fixed out of bounds event channels     available to 32-bit x86 domains (bsc#1176348,XSA-342)

  - CVE-2020-25599: Fixed race conditions with     evtchn_reset() (bsc#1176349,XSA-343)

  - CVE-2020-25601: Fixed an issue due to lack of preemption     in evtchn_reset() / evtchn_destroy()     (bsc#1176350,XSA-344)

  - Various other fixes (bsc#1027519)

This update was imported from the SUSE:SLE-15-SP2:Update update project.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
143853	SUSE SLES12 Security Update : xen (SUSE-SU-2020:2788-1)	Nessus	SuSE Local Security Checks	2020/12/9	2022/5/11	high
140794	Xen PCI Passthrough Code Reading Back Hardware Registers DoS (XSA-337)	Nessus	Misc.	2020/9/25	2020/11/13	high
141168	openSUSE Security Update : xen (openSUSE-2020-1608)	Nessus	SuSE Local Security Checks	2020/10/5	2024/2/16	high

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