Information disclosure in Libssh
CVE-2016-0739
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."
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.024 (83.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000
Affected products
- Libssh
- Canonical Ubuntu Linux — versions 12.04, 14.04, 15.10
- Debian Linux — versions 7.0, 8.0
- Fedoraproject Fedora — versions 22, 23
- Red Hat Enterprise Linux — versions 7.0
Weakness classification (CWE)
References
- lists.fedoraproject.org/pipermail/package-announce/2016-February/178058.html (vendor-advisory)
- www.ubuntu.com/usn/USN-2912-1 (vendor-advisory)
- www.libssh.org/security/advisories/CVE-2016-0739.txt (Vendor Advisory)
- puppet.com/security/cve/CVE-2016-0739
- lists.fedoraproject.org/pipermail/package-announce/2016-March/178822.html (vendor-advisory)
- security.gentoo.org/glsa/201606-12 (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2016/dsa-3488 (vendor-advisory)
- rhn.redhat.com/errata/RHSA-2016-0566.html (vendor-advisory)
- www.libssh.org/2016/02/23/libssh-0-7-3-security-and-bugfix-release/ (Vendor Advisory)
- lists.opensuse.org/opensuse-updates/2016-03/msg00111.html (vendor-advisory)
Frequently asked questions
- What is CVE-2016-0739?
- CVE-2016-0739 is a medium-severity vulnerability in Libssh, classified under Information Disclosure. CVSS score: 5.9/10. Published 2016-04-13.
- How severe is CVE-2016-0739?
- Medium severity. CVSS v3 base score is 5.9 out of 10.