CPython up to 2.7.11/3.4.4/3.5.1 smtplib Library protection mechanism

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in CPython up to 2.7.11/3.4.4/3.5.1. This vulnerability affects unknown code of the component smtplib Library. This manipulation causes protection mechanism. The identification of this vulnerability is CVE-2016-0772. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in CPython up to 2.7.11/3.4.4/3.5.1 (Programming Language Software) and classified as critical. Affected by this vulnerability is an unknown code of the component smtplib Library. The manipulation with an unknown input leads to a protection mechanism vulnerability. The CWE definition for the vulnerability is CWE-693. The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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."

The weakness was shared 09/02/2016 (Website). It is possible to read the advisory at openwall.com. This vulnerability is known as CVE-2016-0772 since 12/16/2015. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 92274 (Fedora 23 : python (2016-a0853405eb)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176661 (Debian Security Update for python3.4 (DLA 1663-1)).

Upgrading to version 2.7.12, 3.4.5 or 3.5.2 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (43500), Tenable (92274) and SecurityFocus (BID 91225†). The entries VDB-91044, VDB-91045 and VDB-98667 are related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 5.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Protection mechanism
CWE: CWE-693
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 92274
Nessus Name: Fedora 23 : python (2016-a0853405eb)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 900061
OpenVAS Name: Fedora Update for python FEDORA-2016-e37f15a5f4
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: CPython 2.7.12/3.4.5/3.5.2

Timelineinfo

12/16/2015 🔍
06/14/2016 +181 days 🔍
06/24/2016 +10 days 🔍
07/15/2016 +21 days 🔍
09/02/2016 +49 days 🔍
09/02/2016 +0 days 🔍
09/03/2016 +1 days 🔍
01/18/2025 +3059 days 🔍

Sourcesinfo

Advisory: RHSA-2016:1626
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-0772 (🔍)
GCVE (CVE): GCVE-0-2016-0772
GCVE (VulDB): GCVE-100-91039

OVAL: 🔍

SecurityFocus: 91225 - Python smtplib CVE-2016-0772 Man in the Middle Security Bypass Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 09/03/2016 10:14
Updated: 01/18/2025 06:37
Changes: 09/03/2016 10:14 (67), 04/07/2019 16:08 (16), 09/14/2022 15:06 (4), 01/18/2025 06:37 (14)
Complete: 🔍
Cache ID: 216:288:103

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