Information disclosure in libssh2 - CVE-2016-0787
Published: April 13, 2016 / Updated: August 3, 2020
Vulnerability identifier: #VU33068
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2016-0787
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: libssh2.org
Affected software:
libssh2
libssh2
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.
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."
How to mitigate CVE-2016-0787
Install update from vendor's website.
Sources
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177980.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178573.html
- http://lists.opensuse.org/opensuse-updates/2016-03/msg00008.html
- http://www.debian.org/security/2016/dsa-3487
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://www.securityfocus.com/bid/82514
- https://bto.bluecoat.com/security-advisory/sa120
- https://kc.mcafee.com/corporate/index?page=content&id=SB10156
- https://puppet.com/security/cve/CVE-2016-0787
- https://security.gentoo.org/glsa/201606-12
- https://www.libssh2.org/adv_20160223.html
- https://www.libssh2.org/CVE-2016-0787.patch