Description
libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key exchange methods to 128 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug."
References (10)
Core 10
Core References
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178058.html
Vendor Advisory vendor-advisory
x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2912-1
Vendor Advisory x_refsource_confirm
https://www.libssh.org/security/advisories/CVE-2016-0739.txt
Various Sources x_refsource_confirm
https://puppet.com/security/cve/CVE-2016-0739
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178822.html
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/201606-12
Third Party Advisory vendor-advisory
x_refsource_debian
http://www.debian.org/security/2016/dsa-3488
Vendor Advisory vendor-advisory
x_refsource_redhat
http://rhn.redhat.com/errata/RHSA-2016-0566.html
Vendor Advisory x_refsource_confirm
https://www.libssh.org/2016/02/23/libssh-0-7-3-security-and-bugfix-release/
Mailing List vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-updates/2016-03/msg00111.html
Scores
CVSS v3
5.9
EPSS
0.0243
EPSS Percentile
82.3%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Details
CWE
CWE-200
Status
published
Products (9)
canonical/ubuntu_linux
12.04
canonical/ubuntu_linux
14.04
canonical/ubuntu_linux
15.10
debian/debian_linux
7.0
debian/debian_linux
8.0
fedoraproject/fedora
22
fedoraproject/fedora
23
libssh/libssh
< 0.7.2
redhat/enterprise_linux
7.0
Published
Apr 13, 2016
Tracked Since
Feb 18, 2026