CVE-2016-0772

Advisory

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 CVE-2016-0772.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

This vulnerability has no description

Resources

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0772
• http://www.openwall.com/lists/oss-security/2016/06/14/9
• https://hg.python.org/cpython/rev/b3ce713fb9be
• 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/d590114c2394
• http://www.securityfocus.com/bid/91225
• http://www.splunk.com/view/SP-CAAAPUE
• http://www.splunk.com/view/SP-CAAAPSV
• https://security.gentoo.org/glsa/201701-18
• http://rhn.redhat.com/errata/RHSA-2016-1630.html
• http://rhn.redhat.com/errata/RHSA-2016-1629.html
• http://rhn.redhat.com/errata/RHSA-2016-1628.html
• http://rhn.redhat.com/errata/RHSA-2016-1627.html
• http://rhn.redhat.com/errata/RHSA-2016-1626.html
• https://lists.debian.org/debian-lts-announce/2019/02/msg00011.html
• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html