CVE-2019-20916
Description
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.
Statement
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.
Mitigation
Avoid downloading or installing packages from potentially malicious servers via the command-line "pip download" or "pip install".
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 | 8 | 7.5 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | None | N/A |
| User Interaction | Required | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | None | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | High | None | N/A |
Vector
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
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