Vulnerabilities
Misconfiguration
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CVE Vulnerabilities

CVE-2020-27617

Reachable Assertion

Published: Nov 06, 2020 | Modified: Nov 21, 2024
CVSS 3.x
6.5
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
4 MEDIUM
AV:N/AC:L/Au:S/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
LOW
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2020-27617
CWEhttps://cwe.mitre.org/data/definitions/617.html

eth_get_gso_type in net/eth.c in QEMU 4.2.1 allows guest OS users to trigger an assertion failure. A guest can crash the QEMU process via packet data that lacks a valid Layer 3 protocol.

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

NameVendorStart VersionEnd Version
QemuQemu4.2.1 (including)4.2.1 (including)
Advanced Virtualization for RHEL 8.3.1RedHatvirt:8.3-8030120210211160750.71132145*
Advanced Virtualization for RHEL 8.3.1RedHatvirt-devel:8.3-8030120210211160750.71132145*
Red Hat Enterprise Linux 8RedHatvirt-devel:rhel-8040020210721215855.522a0ee4*
Red Hat Enterprise Linux 8RedHatvirt:rhel-8040020210721215855.522a0ee4*
QemuUbuntubionic*
QemuUbuntudevel*
QemuUbuntuesm-infra-legacy/trusty*
QemuUbuntuesm-infra/bionic*
QemuUbuntuesm-infra/focal*
QemuUbuntuesm-infra/xenial*
QemuUbuntufocal*
QemuUbuntugroovy*
QemuUbuntuhirsute*
QemuUbuntuimpish*
QemuUbuntujammy*
QemuUbuntukinetic*
QemuUbuntulunar*
QemuUbuntumantic*
QemuUbuntunoble*
QemuUbuntuoracular*
QemuUbuntuplucky*
QemuUbuntuquesting*
QemuUbuntutrusty*
QemuUbuntutrusty/esm*
QemuUbuntuupstream*
QemuUbuntuxenial*
Qemu-kvmUbuntuprecise/esm*

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

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