Description
The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 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 (12)
Core 12
Core References
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177980.html
Vendor Advisory x_refsource_confirm
https://kc.mcafee.com/corporate/index?page=content&id=SB10156
Vendor Advisory x_refsource_confirm
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
Patch x_refsource_confirm
https://www.libssh2.org/CVE-2016-0787.patch
Vendor Advisory x_refsource_confirm
https://www.libssh2.org/adv_20160223.html
Various Sources x_refsource_confirm
https://puppet.com/security/cve/CVE-2016-0787
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178573.html
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/201606-12
Mailing List vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-updates/2016-03/msg00008.html
Various Sources x_refsource_confirm
https://bto.bluecoat.com/security-advisory/sa120
Third Party Advisory vendor-advisory
x_refsource_debian
http://www.debian.org/security/2016/dsa-3487
Third Party Advisory, VDB Entry vdb-entry
x_refsource_bid
http://www.securityfocus.com/bid/82514
Scores
CVSS v3
5.9
EPSS
0.0315
EPSS Percentile
87.1%
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 (6)
debian/debian_linux
7.0
debian/debian_linux
8.0
fedoraproject/fedora
22
fedoraproject/fedora
23
libssh2/libssh2
< 1.6.0
opensuse/opensuse
13.2
Published
Apr 13, 2016
Tracked Since
Feb 18, 2026