Vulnerability CVE-2016-0772


Published: 2016-09-02

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."

See advisories in our WLB2 database:
Topic
Author
Date
Med.
Python smtplib 2.7.11 / 3.4.4 / 3.5.1 Man In The Middle StartTLS Stripping
tintinweb
12.01.2018

Type:

CWE-693

(Protection Mechanism Failure)

Vendor: Python
Product: Python 
Version:
3.5.1
3.5.0
3.4.4
3.4.3
3.4.2
3.4.1
3.4.0
3.3.6
3.3.5
3.3.4
3.3.3
3.3.2
3.3.1
3.3.0
3.2.6
3.2.5
3.2.4
3.2.3
3.2.2
3.2.1
3.2.0
3.1.5
3.1.4
3.1.3
3.1.2
3.1.1
3.1.0
3.0.1
3.0
2.7.11

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5.8/10
4.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
None

 References:
http://rhn.redhat.com/errata/RHSA-2016-1626.html
http://rhn.redhat.com/errata/RHSA-2016-1627.html
http://rhn.redhat.com/errata/RHSA-2016-1628.html
http://rhn.redhat.com/errata/RHSA-2016-1629.html
http://rhn.redhat.com/errata/RHSA-2016-1630.html
http://www.openwall.com/lists/oss-security/2016/06/14/9
http://www.securityfocus.com/bid/91225
http://www.splunk.com/view/SP-CAAAPSV
http://www.splunk.com/view/SP-CAAAPUE
https://bugzilla.redhat.com/show_bug.cgi?id=1303647
https://docs.python.org/3.4/whatsnew/changelog.html#python-3-4-5
https://docs.python.org/3.5/whatsnew/changelog.html#python-3-5-2
https://hg.python.org/cpython/raw-file/v2.7.12/Misc/NEWS
https://hg.python.org/cpython/rev/b3ce713fb9be
https://hg.python.org/cpython/rev/d590114c2394
https://security.gentoo.org/glsa/201701-18

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