According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by an unspecified flaw in arch/x86/mm.c that is triggered as page type  references are not properly handled when performing certain cleanup operations. This allows an attacker on the guest to consume excessive memory, resulting in a denial of service for the host.

Note that Nessus has checked the changeset versions based on the xen.git change log. Nessus did not check guest hardware configurations or if patches were applied manually to the source code before a recompile and reinstall.

This update for xen fixes several issues :

These security issues were fixed :

  - CVE-2017-5526: The ES1370 audio device emulation support     was vulnerable to a memory leakage issue allowing a     privileged user inside the guest to cause a DoS and/or     potentially crash the Qemu process on the host     (bsc#1059777)

  - CVE-2017-15593: Missing cleanup in the page type system     allowed a malicious or buggy PV guest to cause DoS     (XSA-242 bsc#1061084)

  - CVE-2017-15592: A problem in the shadow pagetable code     allowed a malicious or buggy HVM guest to cause DoS or     cause hypervisor memory corruption potentially allowing     the guest to escalate its privilege (XSA-243     bsc#1061086)

  - CVE-2017-15594: Problematic handling of the selector     fields in the Interrupt Descriptor Table (IDT) allowed a     malicious or buggy x86 PV guest to escalate its     privileges or cause DoS (XSA-244 bsc#1061087)

  - CVE-2017-15591: Missing checks in the handling of DMOPs     allowed malicious or buggy stub domain kernels or tool     stacks otherwise living outside of Domain0 to cause a     DoS (XSA-238 bsc#1061077)

  - CVE-2017-15589: Intercepted I/O write operations with     less than a full machine word's worth of data were not     properly handled, which allowed a malicious unprivileged     x86 HVM guest to obtain sensitive information from the     host or other guests (XSA-239 bsc#1061080)

  - CVE-2017-15595: In certain configurations of linear page     tables a stack overflow might have occured that allowed     a malicious or buggy PV guest to cause DoS and     potentially privilege escalation and information leaks     (XSA-240 bsc#1061081)

  - CVE-2017-15588: Under certain conditions x86 PV guests     could have caused the hypervisor to miss a necessary TLB     flush for a page. This allowed a malicious x86 PV guest     to access all of system memory, allowing for privilege     escalation, DoS, and information leaks (XSA-241     bsc#1061082)

  - CVE-2017-15590: Multiple issues existed with the setup     of PCI MSI interrupts that allowed a malicious or buggy     guest to cause DoS and potentially privilege escalation     and information leaks (XSA-237 bsc#1061076)

  - bsc#1055321: When dealing with the grant map space of     add-to-physmap operations, ARM specific code failed to     release a lock. This allowed a malicious guest     administrator to cause DoS (XSA-235)

This update was imported from the SUSE:SLE-12-SP3:Update update project.

This update for xen fixes several issues: These security issues were fixed :

  - CVE-2017-5526: The ES1370 audio device emulation support     was vulnerable to a memory leakage issue allowing a     privileged user inside the guest to cause a DoS and/or     potentially crash the Qemu process on the host     (bsc#1059777)

  - CVE-2017-15593: Missing cleanup in the page type system     allowed a malicious or buggy PV guest to cause DoS     (XSA-242 bsc#1061084)

  - CVE-2017-15592: A problem in the shadow pagetable code     allowed a malicious or buggy HVM guest to cause DoS or     cause hypervisor memory corruption potentially allowing     the guest to escalate its privilege (XSA-243     bsc#1061086)

  - CVE-2017-15594: Problematic handling of the selector     fields in the Interrupt Descriptor Table (IDT) allowed a     malicious or buggy x86 PV guest to escalate its     privileges or cause DoS (XSA-244 bsc#1061087)

  - CVE-2017-15591: Missing checks in the handling of DMOPs     allowed malicious or buggy stub domain kernels or tool     stacks otherwise living outside of Domain0 to cause a     DoS (XSA-238 bsc#1061077)

  - CVE-2017-15589: Intercepted I/O write operations with     less than a full machine word's worth of data were not     properly handled, which allowed a malicious unprivileged     x86 HVM guest to obtain sensitive information from the     host or other guests (XSA-239 bsc#1061080)

  - CVE-2017-15595: In certain configurations of linear page     tables a stack overflow might have occured that allowed     a malicious or buggy PV guest to cause DoS and     potentially privilege escalation and information leaks     (XSA-240 bsc#1061081)

  - CVE-2017-15588: Under certain conditions x86 PV guests     could have caused the hypervisor to miss a necessary TLB     flush for a page. This allowed a malicious x86 PV guest     to access all of system memory, allowing for privilege     escalation, DoS, and information leaks (XSA-241     bsc#1061082)

  - CVE-2017-15590: Multiple issues existed with the setup     of PCI MSI interrupts that allowed a malicious or buggy     guest to cause DoS and potentially privilege escalation     and information leaks (XSA-237 bsc#1061076)

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 host is affected by the vulnerability described in GLSA-201801-14 (Xen: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Xen. Please review the       referenced CVE identifiers for details.
  Impact :

    A local attacker could potentially execute arbitrary code with the       privileges of the Xen (QEMU) process on the host, gain privileges on the       host system, or cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
103977	Xen Hypervisor Page Type Reference Handling Memory Exhaustion Guest-to-Host DoS (XSA-242)	Nessus	Misc.	2017/10/19	2021/6/3	high
104085	openSUSE Security Update : xen (openSUSE-2017-1181)	Nessus	SuSE Local Security Checks	2017/10/23	2025/11/18	high
104255	SUSE SLES12 Security Update : xen (SUSE-SU-2017:2873-1)	Nessus	SuSE Local Security Checks	2017/10/30	2025/11/17	high
106038	GLSA-201801-14 : Xen: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2018/1/15	2025/11/3	high

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