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CVE-2016-0739

Published: 23 February 2016

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."

Notes

AuthorNote
tyhicks
affects "all versions of libssh 0.1 and later"

Priority

Medium

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
libssh
Launchpad, Ubuntu, Debian
upstream
Released (0.7.3)
precise
Released (0.5.2-1ubuntu0.12.04.6)
trusty
Released (0.6.1-0ubuntu3.3)
wily
Released (0.6.3-3ubuntu3.2)
xenial
Released (0.6.3-4.2ubuntu1)
yakkety
Released (0.6.3-4.2ubuntu1)

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N