CVE-2016-0739
Description
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."
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 0.6.3-4.3 |
| debian | bullseye | fixed | 0.6.3-4.3 |
| debian | forky | fixed | 0.6.3-4.3 |
| debian | sid | fixed | 0.6.3-4.3 |
| debian | trixie | fixed | 0.6.3-4.3 |
| ubuntu | 12.04 | affected | |
| ubuntu | 14.04 | affected | |
| ubuntu | 15.10 | affected | |
| debian | 7.0 | affected | |
| debian | 8.0 | affected | |
| fedora | 22 | affected | |
| fedora | 23 | affected | |
| rhel | 7.0 | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| libssh | libssh | {"endIncluding":"0.7.2"} | |
References
- https://www.suse.com/security/cve/CVE-2016-0739.html
- 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
- https://security-tracker.debian.org/tracker/CVE-2016-0739
CWEs
CWE-200
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.