Improper input validation in OpenBSD OpenSSH
CVE-2016-6515
The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.586 (99.1th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.462 · newest: 0.586 · change: +0.124
Affected products
- OpenBSD OpenSSH
- Fedoraproject Fedora — versions 24
Weakness classification (CWE)
Public proof-of-concept exploits
References
- support.hpe.com/hpsc/doc/public/display
- security.netapp.com/advisory/ntap-20171130-0003/
- github.com/openssh/openssh-portable/commit/fcd135c9df440bcd2d5870405ad3311743d7… (Patch, Issue Tracking)
- packetstormsecurity.com/files/140070/OpenSSH-7.2-Denial-Of-Service.html
- www.exploit-db.com/exploits/40888/ (exploit)
- www.securityfocus.com/bid/92212 (vdb-entry)
- security.FreeBSD.org/advisories/FreeBSD-SA-17:06.openssh.asc (vendor-advisory)
- www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- www.securitytracker.com/id/1036487 (vdb-entry)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2016-6515?
- CVE-2016-6515 is a high-severity vulnerability in OpenBSD OpenSSH, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2016-08-07.
- How severe is CVE-2016-6515?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2016-6515 known to be exploited?
- 32 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.