vulnerability
Oracle Linux: CVE-2016-6210: ELSA-2017-2029: openssh security, bug fix, and enhancement update (MODERATE) (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:M/Au:N/C:P/I:N/A:N) | Jul 14, 2016 | Aug 8, 2017 | Dec 3, 2025 |
Severity
4
CVSS
(AV:N/AC:M/Au:N/C:P/I:N/A:N)
Published
Jul 14, 2016
Added
Aug 8, 2017
Modified
Dec 3, 2025
Description
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.
A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users. A remote unauthenticated attacker could possibly use this flaw to determine valid user names by measuring the timing of server responses.
A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users. A remote unauthenticated attacker could possibly use this flaw to determine valid user names by measuring the timing of server responses.
Solutions
oracle-linux-upgrade-opensshoracle-linux-upgrade-openssh-askpassoracle-linux-upgrade-openssh-cavsoracle-linux-upgrade-openssh-clientsoracle-linux-upgrade-openssh-keycatoracle-linux-upgrade-openssh-ldaporacle-linux-upgrade-openssh-serveroracle-linux-upgrade-openssh-server-sysvinitoracle-linux-upgrade-pam-ssh-agent-auth
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