PT-2016-4396 · Libssh+3 · Libssh+3

Aris Adamantiadis · Published 2016-02-23 · Updated 2018-10-08 · CVE-2016-0739

Positive Technologies (AI Summary)

CVSS v3.1

5.9

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions libssh versions prior to 0.7.3

Description The issue is related to a "bits/bytes confusion bug" in the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. This bug causes ephemeral secrets to be improperly truncated to 128 bits, making it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions.

Recommendations For versions prior to 0.7.3, update to version 0.7.3 or later to resolve the issue. As a temporary workaround, consider restricting the use of the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods until a patch is available.

Fix

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

ALT-PU-2017-2001

ALT-PU-2018-2425

CVE-2016-0739

DLA-425-1

DSA-3488-1

MGASA-2016-0082

RHSA-2016:0566

SUSE-SU-2016:0622-1

SUSE-SU-2016:0625-1

SUSE-SU-2016_0622-1

SUSE-SU-2016_0625-1

USN-2912-1

Affected Products

Alt Linux

Suse

Ubuntu

Libssh

References · 31

• https://ubuntu.com/security/notices/USN-2912-1 · Vendor Advisory
• http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178058.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-0739 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-3488-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2016-0739 · Vendor Advisory
• http://debian.org/security/2016/dsa-3488 · Vendor Advisory
• http://rhn.redhat.com/errata/RHSA-2016-0566.html · Vendor Advisory
• https://libssh.org/security/advisories/CVE-2016-0739.txt · Vendor Advisory
• https://libssh.org/2016/02/23/libssh-0-7-3-security-and-bugfix-release · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2016-0739 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2016-0739 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2016-0082 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2016:0622-1 · Vendor Advisory
• http://lists.opensuse.org/opensuse-updates/2016-03/msg00111.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2016-0739 · Security Note