CVE-2019-20916

Advisory

Versions of Pip prior to 19.2 are vulnerable to a directory traversal attack during the installation process from a URL. This vulnerability stems from improperly handling filenames in the Content-Disposition header that include path traversal sequences, potentially allowing unauthorized overwrite of critical files such as /root/.ssh/authorized_keys. The flaw is specifically found in the _download_http_url function within _internal/download.py.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

The pip package before 19.2 for Python allows Directory Traversal when a URL is given in an install command, because a Content-Disposition header can have ../ in a filename, as demonstrated by overwriting the /root/.ssh/authorized_keys file. This occurs in _download_http_url in _internal/download.py.


MISC:https://github.com/gzpan123/pip/commit/a4c735b14a62f9cb864533808ac63936704f2ace: https://github.com/gzpan123/pip/commit/a4c735b14a62f9cb864533808ac63936704f2ace
MISC:https://github.com/pypa/pip/compare/19.1.1...19.2: https://github.com/pypa/pip/compare/19.1.1...19.2
MISC:https://github.com/pypa/pip/issues/6413: https://github.com/pypa/pip/issues/6413

Resources

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20916
• https://github.com/pypa/pip/issues/6413
• https://github.com/gzpan123/pip/commit/a4c735b14a62f9cb864533808ac63936704f2ace
• https://github.com/pypa/pip/compare/19.1.1...19.2
• https://lists.debian.org/debian-lts-announce/2020/09/msg00010.html
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00005.html
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00010.html
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpujul2022.html