CVE-2017-2620 Memory corruption in Qemu:
A privileged guest user can trigger an out-of-bounds access in QEMU's Cirrus VGA emulator to crash the process or execute arbitrary code on the host.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-2620?
CVE-2017-2620 is a medium-severity memory corruption vulnerability in Citrix Xenserver, published on 27 Jul 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Quick emulator (QEMU) before 2.8 built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to an out-of-bounds access issue. The issue could occur while copying VGA data in cirrus_bitblt_cputovideo. A privileged user inside guest could use this flaw to crash the QEMU process OR potentially execute arbitrary code on host with privileges of the QEMU process.
Which versions are affected by CVE-2017-2620?
It affects 10 products.
Linux distribution packages (24)
qemu-guest-agent Red Hat:enterprise_linux:6::client | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-img Red Hat:enterprise_linux:6::client | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm Red Hat:enterprise_linux:6::client | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm-debuginfo Red Hat:enterprise_linux:6::client | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm-tools Red Hat:enterprise_linux:6::client | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-guest-agent Red Hat:enterprise_linux:6::computenode | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-img Red Hat:enterprise_linux:6::computenode | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm Red Hat:enterprise_linux:6::computenode | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm-debuginfo Red Hat:enterprise_linux:6::computenode | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm-tools Red Hat:enterprise_linux:6::computenode | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-img-rhev Red Hat:enterprise_linux:6::hypervisor | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm-rhev Red Hat:enterprise_linux:6::hypervisor | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm-rhev-debuginfo Red Hat:enterprise_linux:6::hypervisor | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm-rhev-tools Red Hat:enterprise_linux:6::hypervisor | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-guest-agent Red Hat:enterprise_linux:6::server | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-img Red Hat:enterprise_linux:6::server | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm Red Hat:enterprise_linux:6::server | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm-debuginfo Red Hat:enterprise_linux:6::server | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm-tools Red Hat:enterprise_linux:6::server | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-guest-agent Red Hat:enterprise_linux:6::workstation | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-img Red Hat:enterprise_linux:6::workstation | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm Red Hat:enterprise_linux:6::workstation | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm-debuginfo Red Hat:enterprise_linux:6::workstation | All versions | 2:0.12.1.2-2.491.el6_8.7 |
qemu-kvm-tools Red Hat:enterprise_linux:6::workstation | All versions | 2:0.12.1.2-2.491.el6_8.7 |
Products include Citrix Xenserver, Debian Debian Linux, Qemu Qemu, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus and 4 more.
How do I fix CVE-2017-2620?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2017-2620 being exploited?
There is no known exploitation of CVE-2017-2620 in the wild and no public exploit code.
Other vulnerabilities in Citrix Xenserver
Sources
Also known as ALPINE-CVE-2017-2620, DEBIAN-CVE-2017-2620, GHSA-v6gr-ph59-9hqm, RHSA-2017:0351, RHSA-2017:0352, UBUNTU-CVE-2017-2620.