Vulnerability in Python
CVE-2016-0772
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."
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N.
EPSS exploit prediction
EPSS: 0.145 (96.5th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.145 · newest: 0.145 · change: 0.000
Affected products
- Python — versions 3.5.0, 3.5.1, 3.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- hg.python.org/cpython/rev/d590114c2394 (Patch)
- www.splunk.com/view/SP-CAAAPUE
- rhn.redhat.com/errata/RHSA-2016-1630.html (vendor-advisory)
- rhn.redhat.com/errata/RHSA-2016-1627.html (vendor-advisory)
- hg.python.org/cpython/rev/b3ce713fb9be (Patch)
- rhn.redhat.com/errata/RHSA-2016-1629.html (vendor-advisory)
- www.splunk.com/view/SP-CAAAPSV
- lists.debian.org/debian-lts-announce/2019/02/msg00011.html (mailing-list)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- docs.python.org/3.4/whatsnew/changelog.html (Release Notes)
Frequently asked questions
- What is CVE-2016-0772?
- CVE-2016-0772 is a medium-severity vulnerability in Python, classified under Protection Mechanism Failure. CVSS score: 6.5/10. Published 2016-09-02.
- How severe is CVE-2016-0772?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2016-0772 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.