CVE-2020-1946
Description
A flaw was found in spamassassin. Malicious rule configuration (.cf) files can be configured to run system commands without any output or errors allowing exploits to be injected in a number of scenarios. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Mitigation
This vulnerability can only be exploited through a malicious rule configuration file. If you are using third-party rule configuration files, it is important to ensure they come only from trusted sources, or are inspected prior to deployment. Even in the absence of this vulnerability, malicious rule configurations could cause significant disruptions to email processed by SpamAssassin.
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 | 7.8 | 9.8 | N/A |
| Attack Vector | Local | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat CVSS v3 Score Explanation
This vulnerability can not be exploited remotely. A malicious rule configuration must be provided (AV:L), which is an operation that can only be performed with appropriate spamassassin administration privileges (PR:L).
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If a malicious user injects a character (such as a semi-colon) that delimits the end of one command and the beginning of another, it may be possible to then insert an entirely new and unrelated command that was not intended to be executed. This gives an attacker a privilege or capability that they would not otherwise have.
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