The remote Ubuntu 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5617-1 advisory.

    It was discovered that memory contents previously stored in microarchitectural special registers after     RDRAND, RDSEED, and SGX EGETKEY read operations on Intel client and Xeon E3 processors may be briefly     exposed to processes on the same or different processor cores. A local attacker could use this to expose     sensitive information. (CVE-2020-0543)

    Julien Grall discovered that Xen incorrectly handled memory barriers on ARM-based systems. An attacker     could possibly use this issue to cause a denial of service, obtain sensitive information or escalate     privileges. (CVE-2020-11739)

    Ilja Van Sprundel discovered that Xen incorrectly handled profiling of guests. An unprivileged attacker     could use this issue to obtain sensitive information from other guests, cause a denial of service or     possibly gain privileges. (CVE-2020-11740, CVE-2020-11741)

    It was discovered that Xen incorrectly handled grant tables. A malicious guest could possibly use this     issue to cause a denial of service. (CVE-2020-11742, CVE-2020-11743)

    Jan Beulich discovered that Xen incorrectly handled certain code paths. An attacker could possibly use     this issue to cause a denial of service. (CVE-2020-15563)

    Julien Grall discovered that Xen incorrectly verified memory addresses provided by the guest on ARM-based     systems. A malicious guest administrator could possibly use this issue to cause a denial of service.
    (CVE-2020-15564)

    Roger Pau Monn discovered that Xen incorrectly handled caching on x86 Intel systems. An attacker could     possibly use this issue to cause a denial of service. (CVE-2020-15565)

    It was discovered that Xen incorrectly handled error in event-channel port allocation. A malicious guest     could possibly use this issue to cause a denial of service. (CVE-2020-15566)

    Jan Beulich discovered that Xen incorrectly handled certain EPT (Extended Page Tables).

    An attacker could possibly use this issue to cause a denial of service, data corruption or privilege     escalation. (CVE-2020-15567)

    Andrew Cooper discovered that Xen incorrectly handled PCI passthrough. An attacker could possibly use this     issue to cause a denial of service. (CVE-2020-25595)

    Andrew Cooper discovered that Xen incorrectly sanitized path injections. An attacker could possibly use     this issue to cause a denial of service. (CVE-2020-25596)

    Jan Beulich discovered that Xen incorrectly handled validation of event channels. An attacker could     possibly use this issue to cause a denial of service. (CVE-2020-25597)

    Julien Grall and Jan Beulich discovered that Xen incorrectly handled resetting event channels. An attacker     could possibly use this issue to cause a denial of service or obtain sensitive information.
    (CVE-2020-25599)

    Julien Grall discovered that Xen incorrectly handled event channels memory allocation on 32-bits domains.
    An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25600)

    Jan Beulich discovered that Xen incorrectly handled resetting or cleaning up event channels. An attacker     could possibly use this issue to cause a denial of service. (CVE-2020-25601)

    Andrew Cooper discovered that Xen incorrectly handled certain Intel specific MSR (Model Specific     Registers). An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25602)

    Julien Grall discovered that Xen incorrectly handled accessing/allocating event channels. An attacker     could possibly use this issue to cause a denial of service, obtain sensitive information of privilege     escalation. (CVE-2020-25603)

    Igor Druzhinin discovered that Xen incorrectly handled locks. An attacker could possibly use this issue to     cause a denial of service. (CVE-2020-25604)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues 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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An issue was discovered in Xen through 4.14.x. There is a lack of preemption in evtchn_reset() /     evtchn_destroy(). In particular, the FIFO event channel model allows guests to have a large number of     event channels active at a time. Closing all of these (when resetting all event channels or when cleaning     up after the guest) may take extended periods of time. So far, there was no arrangement for preemption at     suitable intervals, allowing a CPU to spend an almost unbounded amount of time in the processing of these     operations. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the     entire system. All Xen versions are vulnerable in principle. Whether versions 4.3 and older are vulnerable     depends on underlying hardware characteristics. (CVE-2020-25601)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
165248	Ubuntu 20.04 LTS : Xen vulnerabilities (USN-5617-1)	Nessus	Ubuntu Local Security Checks	2022/9/19	2024/8/28	high
141168	openSUSE Security Update : xen (openSUSE-2020-1608)	Nessus	SuSE Local Security Checks	2020/10/5	2024/2/16	high
256227	Linux Distros Unpatched Vulnerability : CVE-2020-25601	Nessus	Misc.	2025/8/27	2026/7/29	medium

检测

插件搜索

high

high

medium