Date: Tue, 14 Jun 2016 17:46:18 +0200 From: Cedric Buissart <cbuissar@...hat.com> To: oss-security@...ts.openwall.com Subject: Python CVE-2016-0772: smtplib StartTLS stripping attack Hi, This is to publicly disclose Python CVE-2016-0772: smtplib StartTLS stripping attack. Description : A vulnerability in smtplib allowing MITM attacker to perform a startTLS stripping attack. smtplib does not seem to raise an exception when the remote end (smtp server) is capable of negotiating starttls but fails to respond with 220 (ok) to an explicit call of SMTP.starttls(). This may allow a malicious MITM to perform a startTLS stripping attack if the client code does not explicitly check the response code for startTLS. Upstream patch : 3.4 branch : https://hg.python.org/cpython/rev/d590114c2394 2.7 branch : https://hg.python.org/cpython/rev/b3ce713fb9be Red Hat Bugzilla : https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-0772 Reported by: Tin (Team Oststrom) Kind regards, -- Cedric Buissart, Product Security Purkynova 99 Brno 612 45
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