CVE Vulnerabilities

CVE-2020-16092

Reachable Assertion

Published: Aug 11, 2020 | Modified: Oct 13, 2020
CVSS 3.x
3.8
LOW
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
CVSS 2.x
2.1 LOW
AV:L/AC:L/Au:N/C:N/I:N/A:P
RedHat/V2
RedHat/V3
3.8 LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
Ubuntu

In QEMU through 5.0.0, an assertion failure can occur in the network packet processing. This issue affects the e1000e and vmxnet3 network devices. A malicious guest user/process could use this flaw to abort the QEMU process on the host, resulting in a denial of service condition in net_tx_pkt_add_raw_fragment in hw/net/net_tx_pkt.c.

Weakness

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Affected Software

Name Vendor Start Version End Version
Qemu Qemu * 5.0.0
Advanced Virtualization for RHEL 8.2.1 RedHat virt:8.2-8020120201106174547.863bb0db *
Advanced Virtualization for RHEL 8.2.1 RedHat virt-devel:8.2-8020120201106174547.863bb0db *
Red Hat Enterprise Linux 7 RedHat qemu-kvm-ma-10:2.12.0-48.el7_9.2 *
Red Hat Enterprise Linux 7 RedHat qemu-kvm-10:1.5.3-175.el7_9.3 *
Red Hat Enterprise Linux 8 RedHat virt-devel:rhel-8040020210317013608.9f9e2e7e *
Red Hat Enterprise Linux 8 RedHat virt:rhel-8040020210317013608.9f9e2e7e *
Red Hat OpenStack Platform 13.0 (Queens) RedHat qemu-kvm-rhev-10:2.12.0-48.el7_9.2 *
Red Hat Virtualization 4 for Red Hat Enterprise Linux 7 RedHat qemu-kvm-rhev-10:2.12.0-48.el7_9.2 *
Red Hat Virtualization Engine 4.3 RedHat qemu-kvm-rhev-10:2.12.0-48.el7_9.2 *
Qemu Ubuntu bionic *
Qemu Ubuntu devel *
Qemu Ubuntu focal *
Qemu Ubuntu trusty *

Extended Description

While assertion is good for catching logic errors and reducing the chances of reaching more serious vulnerability conditions, it can still lead to a denial of service. For example, if a server handles multiple simultaneous connections, and an assert() occurs in one single connection that causes all other connections to be dropped, this is a reachable assertion that leads to a denial of service.

Potential Mitigations

References