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CVE-2017-15038

Status Candidate

Overview

Race condition in the v9fs_xattrwalk function in hw/9pfs/9p.c in QEMU (aka Quick Emulator) allows local guest OS users to obtain sensitive information from host heap memory via vectors related to reading extended attributes.

Related Files

Ubuntu Security Notice USN-3575-2
Posted Mar 5, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3575-2 - USN-3575-1 fixed vulnerabilities in QEMU. The fix for CVE-2017-11334 caused a regression in Xen environments. This update removes the problematic fix pending further investigation. It was discovered that QEMU incorrectly handled guest ram. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. David Buchanan discovered that QEMU incorrectly handled the VGA device. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue was only addressed in Ubuntu 17.10. Thomas Garnier discovered that QEMU incorrectly handled multiboot. An attacker 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. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-11334, CVE-2017-13672, CVE-2017-14167, CVE-2017-15038, CVE-2017-15118, CVE-2017-15119, CVE-2017-15124, CVE-2017-15268, CVE-2017-15289, CVE-2017-16845, CVE-2017-17381, CVE-2017-18043, CVE-2018-5683
SHA-256 | 9552b2912301778a8c60092d6adbf1e844f5f2e13f1985b94b4fe06b63c2559c
Ubuntu Security Notice USN-3575-1
Posted Feb 20, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3575-1 - It was discovered that QEMU incorrectly handled guest ram. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. David Buchanan discovered that QEMU incorrectly handled the VGA device. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue was only addressed in Ubuntu 17.10. Various other issues were also addressed.

tags | advisory, denial of service
systems | linux, ubuntu
advisories | CVE-2017-11334, CVE-2017-13672, CVE-2017-14167, CVE-2017-15038, CVE-2017-15118, CVE-2017-15119, CVE-2017-15124, CVE-2017-15268, CVE-2017-15289, CVE-2017-16845, CVE-2017-17381, CVE-2017-18043, CVE-2018-5683
SHA-256 | 9216cd38d1a355f9c315588c2a43b7eb0867dc1c8b82f16c2edab968fb6683e4
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