CVE-2016-0787 : The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly t

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."

Published 2016-04-13 17:59:11

Updated 2018-10-30 16:27:36

Source Red Hat, Inc.

View at NVD, CVE.org

Vulnerability category: Information leak

Products affected by CVE-2016-0787

Debian » Debian Linux » Version: 7.0
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
Matching versions
Debian » Debian Linux » Version: 8.0
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 22
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 23
cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
Matching versions
Opensuse » Opensuse » Version: 13.2
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*
Matching versions
Libssh2 » Libssh2
Versions up to, including, (<=) 1.6.0
cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2016-0787

EPSS FAQ

3.15%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 86 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2016-0787

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:P/I:N/A:N	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: Partial Integrity Impact: None Availability Impact: None
5.9	MEDIUM	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N	2.2	3.6	NIST
Attack Vector: Network Attack Complexity: High Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: None Availability: None

CWE ids for CVE-2016-0787

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2016-0787

https://kc.mcafee.com/corporate/index?page=content&id=SB10156

McAfee Security Bulletin: McAfee Web Gateway update fixes multiple vulnerabilities

CVEs referencing this url
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177980.html

[SECURITY] Fedora 23 Update: libssh2-1.6.0-4.fc23
http://www.securityfocus.com/bid/82514

RETIRED: libssh2 'src/kex.c' Security Bypass Vulnerability
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178573.html

[SECURITY] Fedora 22 Update: libssh2-1.5.0-2.fc22
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html

Oracle Linux Bulletin - January 2016

CVEs referencing this url
https://www.libssh2.org/CVE-2016-0787.patch

Patch
https://security.gentoo.org/glsa/201606-12

libssh and libssh2: Multiple vulnerabilities (GLSA 201606-12) — Gentoo security
Third Party Advisory

CVEs referencing this url
https://bto.bluecoat.com/security-advisory/sa120

SA120 : Truncated Diffie-Hellman Secret Generation in libssh2
https://puppet.com/security/cve/CVE-2016-0787

CVE-2016-0787 - libssh2 Vulnerability | Puppet
https://www.libssh2.org/adv_20160223.html

libssh2 Security Advisory: Truncated Difffie-Hellman secret length
Vendor Advisory
http://www.debian.org/security/2016/dsa-3487

Debian -- Security Information -- DSA-3487-1 libssh2
http://lists.opensuse.org/opensuse-updates/2016-03/msg00008.html

openSUSE-SU-2016:0639-1: moderate: Security update for libssh2_org

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Vulnerability Details : CVE-2016-0787

Products affected by CVE-2016-0787

Exploit prediction scoring system (EPSS) score for CVE-2016-0787

CVSS scores for CVE-2016-0787

CWE ids for CVE-2016-0787

References for CVE-2016-0787