CVE-2016-0739

MEDIUM

libssh <0.7.3 - Info Disclosure

Title source: llm

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)

[Vendor Advisory] http://rhn.redhat.com/errata/RHSA-2016-0566.html

[Mailing List] http://lists.opensuse.org/opensuse-updates/2016-03/msg00111.html

[Vendor Advisory] http://www.ubuntu.com/usn/USN-2912-1

[Various Sources] https://puppet.com/security/cve/CVE-2016-0739

[Third Party Advisory] https://security.gentoo.org/glsa/201606-12

[Vendor Advisory] https://www.libssh.org/2016/02/23/libssh-0-7-3-security-and-bugfix-release/

[Vendor Advisory] https://www.libssh.org/security/advisories/CVE-2016-0739.txt

[Mailing List, Third Party Advisory] http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178058.html

[Mailing List, Third Party Advisory] http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178822.html

[Third Party Advisory] http://www.debian.org/security/2016/dsa-3488

Scores

CVSS v3 5.9

EPSS 0.0431

EPSS Percentile 88.7%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Classification

CWE

CWE-200

Status draft

Affected Products (9)

redhat/enterprise_linux

canonical/ubuntu_linux

canonical/ubuntu_linux

canonical/ubuntu_linux

libssh/libssh < 0.7.2

fedoraproject/fedora

fedoraproject/fedora

debian/debian_linux

debian/debian_linux

Timeline

Published Apr 13, 2016

Tracked Since Feb 18, 2026