CVE-2016-6515: Input Validation
A denial of service vulnerability was found in openssh. The authpassword 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.
References:
http://seclists.org/oss-sec/2016/q3/215
Upstream fix:
https://github.com/openssh/openssh-portable/commit/fcd135c9df440bcd2d5870405ad3311743d78d97
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2016-6515?
CVE-2016-6515 has been classified as a denial of service vulnerability that can lead to high CPU consumption due to unrestricted password length in OpenSSH.
How do I fix CVE-2016-6515?
To fix CVE-2016-6515, upgrade OpenSSH to version 7.3 or higher.
What versions of OpenSSH are affected by CVE-2016-6515?
CVE-2016-6515 affects OpenSSH versions prior to 7.3.
What is the impact of CVE-2016-6515 on systems?
The impact of CVE-2016-6515 is that it allows remote attackers to exhaust the CPU resources of a vulnerable system.
Is CVE-2016-6515 exploitable remotely?
Yes, CVE-2016-6515 is exploitable remotely through password authentication.