Information disclosure in OpenBSD OpenSSH
CVE-2016-6210
sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.889 (99.8th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.886 · newest: 0.889 · change: +0.003
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/errata/RHSA-2017:2563 (vendor-advisory)
- www.securitytracker.com/id/1036319 (vdb-entry)
- seclists.org/fulldisclosure/2016/Jul/51 (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2016/dsa-3626 (vendor-advisory)
- www.exploit-db.com/exploits/40136/ (exploit)
- www.exploit-db.com/exploits/40113/ (exploit)
- www.openssh.com/txt/release-7.3 (Release Notes, Vendor Advisory)
- security.gentoo.org/glsa/201612-18 (vendor-advisory)
- access.redhat.com/errata/RHSA-2017:2029 (vendor-advisory)
- www.securityfocus.com/bid/91812 (VDB Entry, Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2016-6210?
- CVE-2016-6210 is a medium-severity vulnerability in OpenBSD OpenSSH, classified under Information Disclosure. CVSS score: 5.9/10. Published 2017-02-13.
- How severe is CVE-2016-6210?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2016-6210 known to be exploited?
- 41 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.