An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service because of an incompatibility between Process Context Identifiers (PCID) and shadow-pagetable switching.

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - xsa224 xen: grant table operations mishandle reference counts (XSA-224) (CVE-2017-10921)

  - The qemu implementation in libvirt before 1.3.0 and Xen allows local guest OS users to cause a denial of     service (host disk consumption) by writing to stdout or stderr. (CVE-2014-3672)

  - Heap-based buffer overflow in the PCNET controller in QEMU allows remote attackers to execute arbitrary     code by sending a packet with TXSTATUS_STARTPACKET set and then a crafted packet with TXSTATUS_DEVICEOWNS     set. (CVE-2015-3209)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

The remote SUSE Linux SLES11 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2019:14199-1 advisory.

  - The ahci_commit_buf function in ide/ahci.c in QEMU allows attackers to cause a denial of service (NULL     dereference) when the command header 'ad->cur_cmd' is null. (CVE-2019-12067)

  - In QEMU 1:4.1-1, 1:2.1+dfsg-12+deb8u6, 1:2.8+dfsg-6+deb9u8, 1:3.1+dfsg-8~deb10u1, 1:3.1+dfsg-8+deb10u2,     and 1:2.1+dfsg-12+deb8u12 (fixed), when executing script in lsi_execute_script(), the LSI scsi adapter     emulator advances 's->dsp' index to read next opcode. This can lead to an infinite loop if the next opcode     is empty. Move the existing loop exit after 10k iterations so that it covers no-op opcodes as well.
    (CVE-2019-12068)

  - interface_release_resource in hw/display/qxl.c in QEMU 3.1.x through 4.0.0 has a NULL pointer dereference.
    (CVE-2019-12155)

  - ip_reass in ip_input.c in libslirp 4.0.0 has a heap-based buffer overflow via a large packet because it     mishandles a case involving the first fragment. (CVE-2019-14378)

  - libslirp 4.0.0, as used in QEMU 4.1.0, has a use-after-free in ip_reass in ip_input.c. (CVE-2019-15890)

  - An issue was discovered in Xen through 4.11.x allowing x86 guest OS users to cause a denial of service or     gain privileges because grant-table transfer requests are mishandled. (CVE-2019-17340)

  - An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service     or gain privileges by leveraging a page-writability race condition during addition of a passed-through PCI     device. (CVE-2019-17341)

  - An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service     or gain privileges by leveraging a race condition that arose when XENMEM_exchange was introduced.
    (CVE-2019-17342)

  - An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service     or gain privileges by leveraging incorrect use of the HVM physmap concept for PV domains. (CVE-2019-17343)

  - An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service     by leveraging a long-running operation that exists to support restartability of PTE updates.
    (CVE-2019-17344)

  - An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service     or gain privileges because of an incompatibility between Process Context Identifiers (PCID) and TLB     flushes. (CVE-2019-17346)

  - An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service     or gain privileges because a guest can manipulate its virtualised %cr4 in a way that is incompatible with     Linux (and possibly other guest kernels). (CVE-2019-17347)

  - An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service     because of an incompatibility between Process Context Identifiers (PCID) and shadow-pagetable switching.
    (CVE-2019-17348)

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

Multiple vulnerabilities have been discovered in the Xen hypervisor, which could result in denial of service, guest-to-host privilege escalation or information leaks.

In addition this update provides mitigations for the 'TSX Asynchronous Abort'speculative side channel attack. For additional information please refer to https://xenbits.xen.org/xsa/advisory-305.html

This update for xen fixes the following issues :

CVE-2019-15890: Fixed a use-after-free in SLiRP networking implementation of QEMU emulator which could have led to Denial of Service (bsc#1149813).

CVE-2019-12068: Fixed an issue in lsi which could lead to an infinite loop and denial of service (bsc#1146874).

CVE-2019-14378: Fixed a heap buffer overflow in SLiRp networking implementation of QEMU emulator which could have led to execution of arbitrary code with privileges of the QEMU process (bsc#1143797).

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 :

Security issues fixed :

CVE-2019-15890: Fixed a use-after-free in SLiRP networking implementation of QEMU emulator which could have led to Denial of Service (bsc#1149813).

CVE-2019-12068: Fixed an issue in lsi which could lead to an infinite loop and denial of service (bsc#1146874).

CVE-2019-14378: Fixed a heap buffer overflow in SLiRp networking implementation of QEMU emulator which could have led to execution of arbitrary code with privileges of the QEMU process (bsc#1143797).

Other issue fixed: Fixed an issue where libxenlight could not restore domain vsa6535522 on live migration (bsc#1133818).

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 to version 4.11.2 fixes the following issues :

Security issues fixed :

CVE-2019-15890: Fixed a use-after-free in SLiRP networking implementation of QEMU emulator which could have led to Denial of Service (bsc#1149813).

CVE-2019-12068: Fixed an issue in lsi which could lead to an infinite loop and denial of service (bsc#1146874).

CVE-2019-14378: Fixed a heap buffer overflow in SLiRp networking implementation of QEMU emulator which could have led to execution of arbitrary code with privileges of the QEMU process (bsc#1143797).

Other issues fixed: Fixed an HPS bug which did not allow to install Windows Server 2016 with 2 CPUs setting or above (bsc#1137717).

Fixed a segmentation fault in Libvrtd during live migration to a VM (bsc#1145774).

Fixed an issue where libxenlight could not create new domain (bsc#1131811).

Fixed an issue where attached pci devices were lost after reboot (bsc#1129642).

Fixed an issue where Xen could not pre-allocate 1 shadow page (bsc#1145240).

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 vulnerability. Only x86 systems are affected.

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.

ID	Name	Product	Family	Severity
199537	RHEL 5 : xen (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
196575	RHEL 5 : xen (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	critical
150593	SUSE SLES11 Security Update : xen (SUSE-SU-2019:14199-1)	Nessus	SuSE Local Security Checks	high
132875	Debian DSA-4602-1 : xen - security update (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)	Nessus	Debian Local Security Checks	critical
130343	SUSE SLES12 Security Update : xen (SUSE-SU-2019:2783-1)	Nessus	SuSE Local Security Checks	high
130253	SUSE SLES12 Security Update : xen (SUSE-SU-2019:2769-1) (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)	Nessus	SuSE Local Security Checks	high
130197	SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2019:2753-1) (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)	Nessus	SuSE Local Security Checks	high
122877	Xen Project Process Context Identifiers Shadow Pagetables Denial of Service Vulnerability (XSA-294)	Nessus	Misc.	medium

Detections

Analytics

CVE-2019-17348

medium

Tenable Plugins

critical

critical

high

critical

high

high

high

medium