CVE-2019-20916
説明
A flaw was found in the pip package installer for Python when downloading or installing a remote package via a specified URL. Improper validation of the "Content-Disposition" HTTP response header makes a path traversal attack possible, leading to an arbitrary file overwrite. This flaw allows an attacker who controls a malicious server to execute arbitrary code on the system.
詳細
This issue has been rated as having Moderate impact because of the preconditions needed to trigger the flaw: it only affects Python Wheels and requires the user to pip-install a wheel from a malicious server. Installing software from untrusted servers is insecure by definition and strongly discouraged, as it may lead to system compromise regardless of this CVE.
This flaw did not affect the versions of python-pip in Python 3.8 as shipped with Red Hat Enterprise Linux 8 and Red Hat Software Collections 3, as they already included the fix for this CVE.
軽減策
Avoid downloading or installing packages from potentially malicious servers via the command-line "pip download" or "pip install".
CVSS (Common Vulnerability Scoring System) のスコアの詳細
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 スコアの内訳
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| ベーススコア | 8 | 7.5 | N/A |
| 攻撃ベクトル | Network | Network | N/A |
| 攻撃の複雑さ | Low | Low | N/A |
| 必要な権限 | Low | None | N/A |
| ユーザー関与レベル | Required | None | N/A |
| 範囲 | Unchanged | Unchanged | N/A |
| 機密性 | High | None | N/A |
| 完全性への影響 | High | High | N/A |
| 可用性への影響 | High | None | N/A |
ベクトル
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
脆弱性の原因 (CWE) の理解
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.
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