| Package | Affected versions | Patched versions |
|---|---|---|
| python | = 3.0= 3.0.1= 3.1.0= 3.1.1= 3.1.2= 3.1.3= 3.1.4= 3.1.5= 3.2.0= 3.2.1= 3.2.2= 3.2.3= 3.2.4= 3.2.5= 3.2.6= 3.3.0= 3.3.1= 3.3.2= 3.3.3= 3.3.4= 3.3.5= 3.3.6= 3.4.0= 3.4.1= 3.4.2= 3.4.3= 3.4.4= 3.5.0= 3.5.1≤ 2.7.11 |
The smtplib library in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 does not return an error when StartTLS fails, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a "StartTLS stripping attack."
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