CVE-2016-0787: Infoleak
First published: Wed Apr 13 2016(Updated: )
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."
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Fedora | =22 | |
| Fedora | =23 | |
| SUSE Linux | =13.2 | |
| Oracle Libssh2 | <=1.6.0 | |
| Debian | =7.0 | |
| Debian | =8.0 |
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Reference Links
- 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/CVE-2016-0787.patch
- https://www.libssh2.org/adv_20160223.html
Frequently Asked Questions
What is the severity of CVE-2016-0787?
CVE-2016-0787 is considered to have a high severity due to its potential impact on SSH session confidentiality.
How do I fix CVE-2016-0787?
To fix CVE-2016-0787, upgrade to libssh2 version 1.7.0 or later, and ensure you are using secure cryptographic settings.
What software is affected by CVE-2016-0787?
CVE-2016-0787 affects libssh2 versions up to 1.6.0 and multiple Linux distributions including Fedora 22, Fedora 23, openSUSE 13.2, and Debian 7.0 or 8.0.
What types of attacks does CVE-2016-0787 expose systems to?
CVE-2016-0787 makes systems vulnerable to man-in-the-middle attacks that can lead to session decryption or interception.
Is CVE-2016-0787 a critical vulnerability?
While not classified as critical, CVE-2016-0787 poses a significant risk due to its exploitation potential affecting SSH communications.
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