CVE-2016-0739: Infoleak
First published: Wed Apr 13 2016(Updated: )
libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key exchange methods to 128 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 |
|---|---|---|
| Red Hat Enterprise Linux | =7.0 | |
| Ubuntu | =12.04 | |
| Ubuntu | =14.04 | |
| Ubuntu | =15.10 | |
| libssh | <=0.7.2 | |
| Red Hat Fedora | =22 | |
| Red Hat Fedora | =23 | |
| Debian Linux | =7.0 | |
| Debian Linux | =8.0 |
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Reference Links
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178058.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178822.html
- http://lists.opensuse.org/opensuse-updates/2016-03/msg00111.html
- http://rhn.redhat.com/errata/RHSA-2016-0566.html
- http://www.debian.org/security/2016/dsa-3488
- http://www.ubuntu.com/usn/USN-2912-1
- https://puppet.com/security/cve/CVE-2016-0739
- https://security.gentoo.org/glsa/201606-12
- https://www.libssh.org/2016/02/23/libssh-0-7-3-security-and-bugfix-release/
- https://www.libssh.org/security/advisories/CVE-2016-0739.txt
Frequently Asked Questions
What is the severity of CVE-2016-0739?
CVE-2016-0739 is rated as high severity due to potential man-in-the-middle attacks leading to decryption of SSH sessions.
How do I fix CVE-2016-0739?
To fix CVE-2016-0739, upgrade libssh to version 0.7.3 or later as well as update any affected operating systems like Red Hat, Ubuntu, Fedora, or Debian.
Which versions of libssh are affected by CVE-2016-0739?
CVE-2016-0739 affects libssh versions prior to 0.7.3, specifically up to version 0.7.2.
What types of key exchange methods are impacted by CVE-2016-0739?
CVE-2016-0739 impacts the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods.
Can CVE-2016-0739 lead to unauthorized access?
Yes, CVE-2016-0739 can facilitate man-in-the-middle attacks, enabling attackers to intercept or decrypt SSH sessions.
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