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."

Category

5.9
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 2.15% Top 20%
Vendor Advisory fedoraproject.org Vendor Advisory ubuntu.com Vendor Advisory fedoraproject.org Vendor Advisory gentoo.org Vendor Advisory debian.org Vendor Advisory redhat.com Vendor Advisory opensuse.org Vendor Advisory libssh.org Vendor Advisory libssh.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178058.html vendor advisory
http://www.ubuntu.com/usn/USN-2912-1 vendor advisory
https://www.libssh.org/security/advisories/CVE-2016-0739.txt vendor advisory
https://puppet.com/security/cve/CVE-2016-0739
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178822.html vendor advisory
https://security.gentoo.org/glsa/201606-12 third party advisory vendor advisory
http://www.debian.org/security/2016/dsa-3488 vendor advisory
http://rhn.redhat.com/errata/RHSA-2016-0566.html vendor advisory
https://www.libssh.org/2016/02/23/libssh-0-7-3-security-and-bugfix-release/ vendor advisory
http://lists.opensuse.org/opensuse-updates/2016-03/msg00111.html vendor advisory

Frequently Asked Questions

What is the severity of CVE-2016-0739?
CVE-2016-0739 has been scored as a medium severity vulnerability.
How to fix CVE-2016-0739?
To fix CVE-2016-0739, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-0739 being actively exploited in the wild?
It is possible that CVE-2016-0739 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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