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CVE-2015-4000

Publication date 20 May 2015

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

3.7 · Low

Score breakdown

The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, aka the "Logjam" issue.

Read the notes from the security team

Status

Package Ubuntu Release Status
apache2 19.04 disco
Not affected
18.10 cosmic
Not affected
18.04 LTS bionic
Not affected
17.10 artful
Not affected
17.04 zesty
Not affected
16.10 yakkety
Not affected
16.04 LTS xenial
Not affected
15.10 wily
Not affected
15.04 vivid
Not affected
14.10 utopic
Not affected
14.04 LTS trusty
Not affected
12.04 LTS precise
Fixed 2.2.22-1ubuntu1.9
firefox 19.04 disco
Fixed 39.0+build5-0ubuntu1
18.10 cosmic
Fixed 39.0+build5-0ubuntu1
18.04 LTS bionic
Fixed 39.0+build5-0ubuntu1
17.10 artful
Fixed 39.0+build5-0ubuntu1
17.04 zesty
Fixed 39.0+build5-0ubuntu1
16.10 yakkety
Fixed 39.0+build5-0ubuntu1
16.04 LTS xenial
Fixed 39.0+build5-0ubuntu1
15.10 wily
Fixed 39.0+build5-0ubuntu1
15.04 vivid
Fixed 39.0+build5-0ubuntu0.15.04.1
14.10 utopic
Fixed 39.0+build5-0ubuntu0.14.10.1
14.04 LTS trusty
Fixed 39.0+build5-0ubuntu0.14.04.1
12.04 LTS precise
Fixed 39.0+build5-0ubuntu0.12.04.2
gnutls26 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
17.10 artful 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
15.04 vivid Not in release
14.10 utopic
Not affected
14.04 LTS trusty
Not affected
12.04 LTS precise
Not affected
gnutls28 19.04 disco
Not affected
18.10 cosmic
Not affected
18.04 LTS bionic
Not affected
17.10 artful
Not affected
17.04 zesty
Not affected
16.10 yakkety
Not affected
16.04 LTS xenial
Not affected
15.10 wily
Not affected
15.04 vivid
Not affected
14.10 utopic
Not affected
14.04 LTS trusty Not in release
12.04 LTS precise
Not affected
nss 19.04 disco
Fixed 2:3.19.2-1ubuntu1
18.10 cosmic
Fixed 2:3.19.2-1ubuntu1
18.04 LTS bionic
Fixed 2:3.19.2-1ubuntu1
17.10 artful
Fixed 2:3.19.2-1ubuntu1
17.04 zesty
Fixed 2:3.19.2-1ubuntu1
16.10 yakkety
Fixed 2:3.19.2-1ubuntu1
16.04 LTS xenial
Fixed 2:3.19.2-1ubuntu1
15.10 wily
Fixed 2:3.19.2-1ubuntu1
15.04 vivid
Fixed 2:3.19.2-0ubuntu15.04.1
14.10 utopic
Fixed 2:3.19.2-0ubuntu0.14.10.1
14.04 LTS trusty
Fixed 2:3.19.2-0ubuntu0.14.04.1
12.04 LTS precise
Fixed 3.19.2-0ubuntu0.12.04.1
openjdk-6 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
17.10 artful 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 affected
15.04 vivid
Fixed 6b36-1.13.8-0ubuntu1~15.04.1
14.10 utopic Ignored end of life
14.04 LTS trusty
Fixed 6b36-1.13.8-0ubuntu1~14.04
12.04 LTS precise
Fixed 6b36-1.13.8-0ubuntu1~12.04
openjdk-7 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
17.10 artful 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 affected
15.04 vivid
Fixed 7u79-2.5.6-0ubuntu1.15.04.1
14.10 utopic Ignored end of life
14.04 LTS trusty
Fixed 7u79-2.5.6-0ubuntu1.14.04.1
12.04 LTS precise
Fixed 7u79-2.5.6-0ubuntu1.12.04.1
openjdk-8 19.04 disco
Not affected
18.10 cosmic
Not affected
18.04 LTS bionic
Not affected
17.10 artful
Not affected
17.04 zesty
Not affected
16.10 yakkety
Not affected
16.04 LTS xenial
Not affected
15.10 wily
Fixed 8u66-b17-1
15.04 vivid Ignored end of life
14.10 utopic Ignored end of life
14.04 LTS trusty Not in release
12.04 LTS precise Not in release
openssl 19.04 disco
Not affected
18.10 cosmic
Not affected
18.04 LTS bionic
Not affected
17.10 artful
Not affected
17.04 zesty
Not affected
16.10 yakkety
Not affected
16.04 LTS xenial
Not affected
15.10 wily
Not affected
15.04 vivid
Fixed 1.0.1f-1ubuntu11.1
14.10 utopic
Fixed 1.0.1f-1ubuntu9.5
14.04 LTS trusty
Fixed 1.0.1f-1ubuntu2.12
12.04 LTS precise
Fixed 1.0.1-4ubuntu5.28
openssl098 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic Not in release
17.10 artful 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
15.04 vivid Ignored end of life
14.10 utopic Ignored end of life
14.04 LTS trusty Not in release
12.04 LTS precise Ignored end of life
thunderbird 19.04 disco
Fixed 1:31.8.0+build1-0ubuntu1
18.10 cosmic
Fixed 1:31.8.0+build1-0ubuntu1
18.04 LTS bionic
Fixed 1:31.8.0+build1-0ubuntu1
17.10 artful
Fixed 1:31.8.0+build1-0ubuntu1
17.04 zesty
Fixed 1:31.8.0+build1-0ubuntu1
16.10 yakkety
Fixed 1:31.8.0+build1-0ubuntu1
16.04 LTS xenial
Fixed 1:31.8.0+build1-0ubuntu1
15.10 wily
Fixed 1:31.8.0+build1-0ubuntu1
15.04 vivid
Fixed 1:31.8.0+build1-0ubuntu0.15.04.1
14.10 utopic
Fixed 1:31.8.0+build1-0ubuntu0.14.10.1
14.04 LTS trusty
Fixed 1:31.8.0+build1-0ubuntu0.14.04.1
12.04 LTS precise
Fixed 1:31.8.0+build1-0ubuntu0.12.04.1

Notes

mdeslaur

USN-2624-1 disables export ciphers completely in openssl USN-2625-1 disables export ciphers in apache2 in precise

seth-arnold

USN-2639-1 disables <768 bit dh parameters in openssl

mdeslaur

USN-2672-1 disables <768 bit dh parameters in nss

sbeattie

USN-2696-1 disables <768 bit dh parameters in openjdk-7

mdeslaur

gnutls isn't vulnerable to this issue and rejects small dh keys by default. On precise and trusty, the gnutls-cli tool unfortunately sets the minimum dh size to 512 using gnutls_dh_set_prime_bits(), so that must be disabled to test using the command line tool.

Severity score breakdown

Parameter Value
Base score 3.7 · Low
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact Low
Availability impact None
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N