SB2016041318 - Information disclosure in libssh2
Published: April 13, 2016 Updated: August 3, 2020
Security Bulletin ID
SB2016041318
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Information disclosure (CVE-ID: CVE-2016-0787)
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."
Remediation
Install update from vendor's website.
References
- 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