CVE-2020-26303
Description
A flaw was found in the insane package, a whitelist-oriented HTML sanitizer. Affected versions of this package contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS).
Statement
The ReDoS vulnerability in insane is categorized as an important severity issue rather than critical due to the specific conditions required for exploitation and the nature of the impact. ReDoS attacks exploit inefficient regular expressions that cause excessive backtracking, potentially slowing down or freezing an application under targeted input patterns. However, they do not typically allow code execution or unauthorized access to sensitive data, which would elevate it to a critical severity.
Logging Subsystem for Red Hat OpenShift does not impacted & unaffected by this specific CVE because it is used only in custom notification banners, which are not enabled for use in OpenShift Logging's Kibana.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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).
The following CVSS metrics and score provided are preliminary and subject to review.
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)
Attackers can create crafted inputs that intentionally cause the regular expression to use excessive backtracking in a way that causes the CPU consumption to spike.
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