CVE-2015-20107

Published: 13 April 2022

In Python (aka CPython) up to 3.10.8, the mailcap module does not add escape characters into commands discovered in the system mailcap file. This may allow attackers to inject shell commands into applications that call mailcap.findmatch with untrusted input (if they lack validation of user-provided filenames or arguments). The fix is also back-ported to 3.7, 3.8, 3.9

Notes

patch was proposed in cpython Lib/mailcap.py but not merged yet.
it sounds a better approach was PR to fix that issue, but still
not merged yet.
there are plenty of discussions going on about proper ways to fix
that issue, but none was accept yet that fix the issue and keep
the software working properly.

Status

Severity score breakdown

References

• https://mail.python.org/archives/list/security-announce@python.org/thread/QDSXNCW77UGULFG2JMDFZQ7H4DIR32LA/
• https://github.com/python/cpython/pull/91542/commits/340251550897cb98ae83ad1040750d6300112e80
• https://github.com/python/cpython/pull/91993
• https://ubuntu.com/security/notices/USN-5519-1
• https://ubuntu.com/security/notices/USN-5888-1
• https://www.cve.org/CVERecord?id=CVE-2015-20107
• NVD
• Launchpad
• Debian

Bugs

• https://bugs.launchpad.net/ubuntu/+source/python3.5/+bug/1510317
• https://github.com/python/cpython/issues/68966
• https://bugs.python.org/issue24778