Michael Hanselmann discovered that QEMU incorrectly handled the Media Transfer Protocol (MTP). An attacker inside the guest could use this issue to read or write arbitrary files and cause a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.10. (CVE-2018-16867)

Michael Hanselmann discovered that QEMU incorrectly handled the Media Transfer Protocol (MTP). An attacker inside the guest could use this issue to read arbitrary files, contrary to expectations. This issue only affected Ubuntu 18.04 LTS and Ubuntu 18.10. (CVE-2018-16872)

Zhibin Hu discovered that QEMU incorrectly handled the Plan 9 File System support. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service.
(CVE-2018-19489)

Li Quang and Saar Amar discovered multiple issues in the QEMU PVRDMA device. An attacker inside the guest could use these issues to cause a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.10. These issues were resolved by disabling PVRDMA support in Ubuntu 18.10. (CVE-2018-20123, CVE-2018-20124, CVE-2018-20125, CVE-2018-20126, CVE-2018-20191, CVE-2018-20216)

Michael Hanselmann discovered that QEMU incorrectly handled certain i2c commands. A local attacker could possibly use this issue to read QEMU process memory. This issue only affected Ubuntu 18.04 LTS and Ubuntu 18.10. (CVE-2019-3812)

It was discovered that QEMU incorrectly handled the Slirp networking back-end. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code on the host. In the default installation, when QEMU is used with libvirt, attackers would be isolated by the libvirt AppArmor profile. (CVE-2019-6778).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-4556 advisory.

  - A flaw was found in qemu Media Transfer Protocol (MTP) before version 3.1.0. A path traversal in the in     usb_mtp_write_data function in hw/usb/dev-mtp.c due to an improper filename sanitization. When the guest     device is mounted in read-write mode, this allows to read/write arbitrary files which may lead do DoS     scenario OR possibly lead to code execution on the host. (CVE-2018-16867)

  - hw/rdma/vmw/pvrdma_main.c in QEMU does not implement a read operation (such as uar_read by analogy to     uar_write), which allows attackers to cause a denial of service (NULL pointer dereference).
    (CVE-2018-20191)

  - A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in usb_mtp_get_object and     usb_mtp_get_partial_object and directories in usb_mtp_object_readdir doesn't consider that the underlying     filesystem may have changed since the time lstat(2) was called in usb_mtp_object_alloc, a classical     TOCTTOU problem. An attacker with write access to the host filesystem shared with a guest can use this     property to navigate the host filesystem in the context of the QEMU process and read any file the QEMU     process has access to. Access to the filesystem may be local or via a network share protocol such as CIFS.
    (CVE-2018-16872)

  - hw/rdma/rdma_backend.c in QEMU allows guest OS users to trigger out-of-bounds access via a PvrdmaSqWqe     ring element with a large num_sge value. (CVE-2018-20124)

  - QEMU can have an infinite loop in hw/rdma/vmw/pvrdma_dev_ring.c because return values are not checked (and
    -1 is mishandled). (CVE-2018-20216)

  - hw/rdma/vmw/pvrdma_cmd.c in QEMU allows attackers to cause a denial of service (NULL pointer dereference     or excessive memory allocation) in create_cq_ring or create_qp_rings. (CVE-2018-20125)

  - hw/rdma/vmw/pvrdma_cmd.c in QEMU allows create_cq and create_qp memory leaks because errors are     mishandled. (CVE-2018-20126)

  - pvrdma_realize in hw/rdma/vmw/pvrdma_main.c in QEMU has a Memory leak after an initialisation error.
    (CVE-2018-20123)

  - In QEMU 3.0.0, tcp_emu in slirp/tcp_subr.c has a heap-based buffer overflow. (CVE-2019-6778)

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

- fix crash with virgl enabled (bz #1692323)

  - linux-user: make pwrite64/pread64(fd, NULL, 0, offset)     return 0 (bz #1174267)

  - Fix build with latest gluster (bz #1684298)

  - CVE-2018-20123: pvrdma: memory leakage in device hotplug     (bz #1658964)

  - CVE-2018-16872: usb-mtp: path traversal issue (bz     #1659150)

  - CVE-2018-20191: pvrdma: uar_read leads to NULL deref (bz     #1660315)

  - CVE-2019-6501: scsi-generic: possible OOB access (bz     #1669005)

  - CVE-2019-6778: slirp: heap buffer overflow (bz #1669072)

  - CVE-2019-3812: Out-of-bounds read in hw/i2c/i2c-ddc.c     allows for memory disclosure (bz #1678081)

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.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-4640 advisory.

  - pvrdma_realize in hw/rdma/vmw/pvrdma_main.c in QEMU has a Memory leak after an initialisation error.
    (CVE-2018-20123)

  - In QEMU 3.0.0, tcp_emu in slirp/tcp_subr.c has a heap-based buffer overflow. (CVE-2019-6778)

  - Microarchitectural Store Buffer Data Sampling (MSBDS): Store buffers on some microprocessors utilizing     speculative execution may allow an authenticated user to potentially enable information disclosure via a     side channel with local access. A list of impacted products can be found here:
    https://www.intel.com/content/dam/www/public/us/en/documents/corporate-information/SA00233-microcode-     update-guidance_05132019.pdf (CVE-2018-12126)

  - Microarchitectural Fill Buffer Data Sampling (MFBDS): Fill buffers on some microprocessors utilizing     speculative execution may allow an authenticated user to potentially enable information disclosure via a     side channel with local access. A list of impacted products can be found here:
    https://www.intel.com/content/dam/www/public/us/en/documents/corporate-information/SA00233-microcode-     update-guidance_05132019.pdf (CVE-2018-12130)

  - Microarchitectural Load Port Data Sampling (MLPDS): Load ports on some microprocessors utilizing     speculative execution may allow an authenticated user to potentially enable information disclosure via a     side channel with local access. A list of impacted products can be found here:
    https://www.intel.com/content/dam/www/public/us/en/documents/corporate-information/SA00233-microcode-     update-guidance_05132019.pdf (CVE-2018-12127)

  - Microarchitectural Data Sampling Uncacheable Memory (MDSUM): Uncacheable memory on some microprocessors     utilizing speculative execution may allow an authenticated user to potentially enable information     disclosure via a side channel with local access. A list of impacted products can be found here:
    https://www.intel.com/content/dam/www/public/us/en/documents/corporate-information/SA00233-microcode-     update-guidance_05132019.pdf (CVE-2019-11091)

  - The Bluetooth subsystem in QEMU mishandles negative values for length variables, leading to memory     corruption. (CVE-2018-19665)

  - In QEMU 3.1, scsi_handle_inquiry_reply in hw/scsi/scsi-generic.c allows out-of-bounds write and read     operations. (CVE-2019-6501)

  - tcp_emu in slirp/tcp_subr.c (aka slirp/src/tcp_subr.c) in QEMU 3.0.0 uses uninitialized data in an     snprintf call, leading to Information disclosure. (CVE-2019-9824)

  - Qemu has integer overflows because IOReadHandler and its associated functions use a signed integer data     type for a size value. (CVE-2018-18438)

  - In QEMU 3.1.0, load_device_tree in device_tree.c calls the deprecated load_image function, which has a     buffer overflow risk. (CVE-2018-20815)

  - QEMU, through version 2.10 and through version 3.1.0, is vulnerable to an out-of-bounds read of up to 128     bytes in the hw/i2c/i2c-ddc.c:i2c_ddc() function. A local attacker with permission to execute i2c commands     could exploit this to read stack memory of the qemu process on the host. (CVE-2019-3812)

  - hw/ppc/spapr.c in QEMU through 3.1.0 allows Information Exposure because the hypervisor shares the     /proc/device-tree/system-id and /proc/device-tree/model system attributes with a guest. (CVE-2019-8934)

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

Description of changes:

[15:3.1.0-5.el7]
- Only enable the halt poll control MSR if it is supported by the host (Mark Kanda) [Orabug: 29946722]

[15:3.1.0-4.el7]
- kvm: i386: halt poll control MSR support (Marcelo Tosatti) [Orabug: 29933278]
- Document CVEs as fixed: CVE-2017-9524, CVE-2017-6058, CVE-2017-5931 (Mark Kanda) [Orabug: 29886908] {CVE-2017-5931} {CVE-2017-6058} {CVE-2017-9524}
- pvrdma: release device resources in case of an error (Prasad J Pandit) [Orabug: 29056678] {CVE-2018-20123}
- qxl: check release info object (Prasad J Pandit) [Orabug: 29886906] {CVE-2019-12155}
- target/i386: add MDS-NO feature (Paolo Bonzini) [Orabug: 29820428] {CVE-2018-12126} {CVE-2018-12127} {CVE-2018-12130} {CVE-2019-11091}
- docs: recommend use of md-clear feature on all Intel CPUs (Daniel P. Berrang&eacute ) [Orabug: 29820428] {CVE-2018-12126} {CVE-2018-12127} {CVE-2018-12130} {CVE-2019-11091}
- target/i386: define md-clear bit (Paolo Bonzini) [Orabug: 29820428] {CVE-2018-12126} {CVE-2018-12127} {CVE-2018-12130} {CVE-2019-11091}
- pvh: block migration if booting using PVH (Liam Merwick) [Orabug: 29796676]
- hw/i386/pc: run the multiboot loader before the PVH loader (Stefano Garzarella) [Orabug: 29796676]
- optionrom/pvh: load initrd from fw_cfg (Stefano Garzarella) [Orabug: 29796676]
- hw/i386/pc: use PVH option rom (Stefano Garzarella) [Orabug: 29796676]
- qemu.spec: add pvh.bin to %files (Liam Merwick) [Orabug: 29796676]
- optionrom: add new PVH option rom (Stefano Garzarella) [Orabug: 29796676]
- linuxboot_dma: move common functions in a new header (Stefano Garzarella) [Orabug: 29796676]
- linuxboot_dma: remove duplicate definitions of FW_CFG (Stefano Garzarella) [Orabug: 29796676]
- pvh: load initrd and expose it through fw_cfg (Stefano Garzarella) [Orabug: 29796676]
- pvh: Boot uncompressed kernel using direct boot ABI (Liam Merwick) [Orabug: 29796676]
- pvh: Add x86/HVM direct boot ABI header file (Liam Merwick) [Orabug: 29796676]
- elf-ops.h: Add get_elf_note_type() (Liam Merwick) [Orabug: 29796676]
- elf: Add optional function ptr to load_elf() to parse ELF notes (Liam Merwick) [Orabug: 29796676]

ID	Name	Product	Family	Published	Updated	Severity
123457	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : QEMU vulnerabilities (USN-3923-1)	Nessus	Ubuntu Local Security Checks	3/28/2019	10/21/2023	high
180708	Oracle Linux 7 : qemu (ELSA-2019-4556)	Nessus	Oracle Linux Local Security Checks	9/7/2023	9/7/2023	high
124467	Fedora 30 : 2:qemu (2019-0664c7724d)	Nessus	Fedora Local Security Checks	5/2/2019	1/21/2020	high
180647	Oracle Linux 7 : qemu (ELSA-2019-4640)	Nessus	Oracle Linux Local Security Checks	9/7/2023	9/8/2023	critical
126673	Oracle Linux 7 : qemu (ELSA-2019-4713) (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout)	Nessus	Oracle Linux Local Security Checks	7/15/2019	5/10/2024	high

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