Description
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."
Exploits (1)
References (18)
Core 18
Core References
Vendor Advisory vendor-advisory
x_refsource_redhat
http://rhn.redhat.com/errata/RHSA-2016-1630.html
Vendor Advisory vendor-advisory
x_refsource_redhat
http://rhn.redhat.com/errata/RHSA-2016-1627.html
Vendor Advisory vendor-advisory
x_refsource_redhat
http://rhn.redhat.com/errata/RHSA-2016-1629.html
Mailing List mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2019/02/msg00011.html
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/201701-18
Third Party Advisory, VDB Entry vdb-entry
x_refsource_bid
http://www.securityfocus.com/bid/91225
Vendor Advisory vendor-advisory
x_refsource_redhat
http://rhn.redhat.com/errata/RHSA-2016-1628.html
Vendor Advisory vendor-advisory
x_refsource_redhat
http://rhn.redhat.com/errata/RHSA-2016-1626.html
Patch x_refsource_confirm
https://hg.python.org/cpython/rev/d590114c2394
Various Sources x_refsource_confirm
http://www.splunk.com/view/SP-CAAAPUE
Patch x_refsource_confirm
https://hg.python.org/cpython/rev/b3ce713fb9be
Various Sources x_refsource_confirm
http://www.splunk.com/view/SP-CAAAPSV
Issue Tracking, Third Party Advisory x_refsource_confirm
https://bugzilla.redhat.com/show_bug.cgi?id=1303647
Release Notes x_refsource_confirm
https://docs.python.org/3.4/whatsnew/changelog.html#python-3-4-5
Mailing List mailing-list
x_refsource_mlist
http://www.openwall.com/lists/oss-security/2016/06/14/9
Release Notes x_refsource_confirm
https://hg.python.org/cpython/raw-file/v2.7.12/Misc/NEWS
Release Notes x_refsource_confirm
https://docs.python.org/3.5/whatsnew/changelog.html#python-3-5-2
Mailing List vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
Scores
CVSS v3
6.5
EPSS
0.0764
EPSS Percentile
91.9%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Details
CWE
CWE-693
Status
published
Products (30)
python/python
3.5.0
python/python
3.5.1
python/python
3.0
python/python
3.0.1
python/python
3.1.0
python/python
3.1.1
python/python
3.1.2
python/python
3.1.3
python/python
3.1.4
python/python
3.1.5
... and 20 more
Published
Sep 02, 2016
Tracked Since
Feb 18, 2026