CVE-2020-8161
Description
A directory traversal vulnerability was found in the Rack::Directory app that is bundled with Rack. If certain directories exist in a director managed by the Rack::Directory, this flaw allows an attacker to read the contents of files on the server outside of the root specified in the Rack::Directory initializer. The highest threat from this vulnerability is to confidentiality.
Statement
Because the following products package the flawed code, but do not use its functionality (Rack::Directory), their impact has been reduced to 'Low':
- Red Hat CloudForms
- Red Hat OpenStack Platform 13.0 Operational Tools
- Red Hat Gluster Storage 3
Red Hat Satellite 6 ships the affected version of RubyGem Rack and is vulnerable to the flaw. However, because attackers require shell access to exploit the vulnerability, Red Hat Product Security has rated this issue as having the security impact of Low for Satellite. A future update might address this issue.
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 | 5.9 | 8.6 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | High | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Changed | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | None | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Red Hat CVSS v3 Score Explanation
Attack complexity and scope of this vulnerability really depends on product. According to external reference, to exploit this vulnerability certain directories need to be exist in a director that is managed by Rack::Directory.
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
The attacker may be able to create or overwrite critical files that are used to execute code, such as programs or libraries.
Integrity
Technical Impact: Modify Files or Directories
The attacker may be able to overwrite or create critical files, such as programs, libraries, or important data. If the targeted file is used for a security mechanism, then the attacker may be able to bypass that mechanism. For example, appending a new account at the end of a password file may allow an attacker to bypass authentication.
Confidentiality
Technical Impact: Read Files or Directories
The attacker may be able read the contents of unexpected files and expose sensitive data. If the targeted file is used for a security mechanism, then the attacker may be able to bypass that mechanism. For example, by reading a password file, the attacker could conduct brute force password guessing attacks in order to break into an account on the system.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
The attacker may be able to overwrite, delete, or corrupt unexpected critical files such as programs, libraries, or important data. This may prevent the product from working at all and in the case of protection mechanisms such as authentication, it has the potential to lock out product users.
Frequently Asked Questions
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