CVE-2022-25887
Description
A flaw was found in sanitize-html library. Insecure global regular expression replacement logic of HTML comment removal could lead to a regular expression Denial of Service (ReDoS), affecting the availability of the affected component.
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 | 5.3 | 7.5 | 5.3 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | None | None |
| Integrity Impact | None | None | None |
| Availability Impact | Low | High | Low |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Red Hat CVSS v3 Score Explanation
The availability is set to low as per the information available publicly in https://security.snyk.io/vuln/SNYK-JS-SANITIZEHTML-2957526. The reason is that this would increase the amount of CPU for the subsystem which executed that query, and it is not impacting the entire system.
Understanding the Weakness (CWE)
Other
Technical Impact: Unexpected State; Varies by Context
When the regular expression is not correctly specified, data might have a different format or type than the rest of the program expects, producing resultant weaknesses or errors.
Access Control
Technical Impact: Bypass Protection Mechanism
In PHP, regular expression checks can sometimes be bypassed with a null byte, leading to any number of weaknesses.
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