#VU48600 Path traversal in py-pip - CVE-2019-20916
Published: September 4, 2020 / Updated: July 20, 2022
Vulnerability identifier: #VU48600
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-20916
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
py-pip
py-pip
Software vendor:
www.pip-installer.org
www.pip-installer.org
Description
The vulnerability allows a remote attacker to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences passed via URL to the install command within the _download_http_url() function in _internal/download.py. A remote attacker can send a specially crafted HTTP request with the Content-Disposition header that contains directory traversal characters in the filename and overwrite the /root/.ssh/authorized_keys file.
Remediation
Install update from vendor's website.
External links
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00005.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00010.html
- https://github.com/gzpan123/pip/commit/a4c735b14a62f9cb864533808ac63936704f2ace
- https://github.com/pypa/pip/compare/19.1.1...19.2
- https://github.com/pypa/pip/issues/6413
- https://lists.debian.org/debian-lts-announce/2020/09/msg00010.html