CVE-2016-0772

Publication date 2 September 2016

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.5 · Medium

Score breakdown

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."

Read the notes from the security team

Status

Package Ubuntu Release Status
python2.7 23.04 lunar Not in release
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
21.10 impish
Not affected
21.04 hirsute
Not affected
20.10 groovy
Not affected
20.04 LTS focal
Not affected
19.10 eoan
Not affected
19.04 disco
Not affected
18.04 LTS bionic
Not affected
17.04 zesty
Not affected
16.10 yakkety
Not affected
16.04 LTS xenial
Fixed 2.7.12-1ubuntu0~16.04.1
15.10 wily Ignored end of life
14.04 LTS trusty
Fixed 2.7.6-8ubuntu0.3
12.04 LTS precise
Fixed 2.7.3-0ubuntu3.9
python3.2 23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
19.10 eoan Not in release
19.04 disco Not in release
18.04 LTS bionic Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise
Fixed 3.2.3-0ubuntu3.8
python3.4 23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
19.10 eoan Not in release
19.04 disco Not in release
18.04 LTS bionic Not in release
17.04 zesty Not in release
16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Ignored end of life
14.04 LTS trusty
Fixed 3.4.3-1ubuntu1~14.04.5
12.04 LTS precise Not in release
python3.5 23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
19.10 eoan Not in release
19.04 disco Not in release
18.04 LTS bionic Not in release
17.04 zesty
Not affected
16.10 yakkety
Not affected
16.04 LTS xenial
Fixed 3.5.2-2ubuntu0~16.04.1
15.10 wily Ignored end of life
14.04 LTS trusty
Fixed 3.5.2-2ubuntu0~16.04.4~14.04.1
12.04 LTS precise Not in release

Notes

sbeattie

issue is fixed for xenial/python3.5 and xenial/python2.7 for packages in xenial-updates, but not xenial-security

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
python2.7
python3.4

Severity score breakdown

Parameter Value
Base score 6.5 · Medium
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact High
Availability impact None
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-3134-1
    • Python vulnerabilities
    • 22 November 2016

Other references