CVE-2021-27918
Description
An infinite loop vulnerability was found in golang. If an application defines a custom token parser initializing with xml.NewTokenDecoder it is possible for the parsing loop to never return. An attacker could potentially craft a malicious XML document which has an XML element with EOF within it, causing the parsing application to endlessly loop, resulting in a Denial of Service (DoS).
Statement
OpenShift Container Platform (OCP), OpenShift ServiceMesh (OSSM), Red Hat OpenShift Jaeger (RHOSJ) and OpenShift Virtualization all bundle vulnerable versions of the golang standard library (stdlib). However, no component within each product utilizes the function xml.NewTokenDecoder which is a requirement to be vulnerable. Hence, all affected components are marked as "Will not fix". Additionally no OCP container has been listed, as nearly all available containers are compiled with an affected version of Go, but do not utilize the function xml.NewTokenDecoder.
Red Hat Ceph Storage (RHCS), Red Hat Gluster Storage 3 and OpenShift Container Storage 4 also bundles a vulnerable version of golang standard library 'encoding/xml', but does not utilize the function xml.NewTokenDecoder, and hence this issue has been rated as having a security impact of Low.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | 7.5 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Amplification
An infinite loop will cause unexpected consumption of resources, such as CPU cycles or memory. The software's operation may slow down, or cause a long time to respond.
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