Red Hat Security Advisory 2017-2563-01 - OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server. Security Fix: 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.
6772db3539ac28058a8dcd85adcd01f09d836815a6d2fd1a69ba5c6d44438755Red Hat Security Advisory 2017-2029-01 - OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server. The following packages have been upgraded to a later upstream version: openssh. Security Fix: 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.
d968f1977aa418a410f4eb0347eb315fb89ecda3c383e34f02b7ceef8867f98aGentoo Linux Security Advisory 201612-18 - Multiple vulnerabilities have been found in OpenSSH, the worst of which allows remote attackers to cause Denial of Service. Versions less than 7.3_p1-r7 are affected.
cc124780a02d52103b56c764eff6ad2156bc5a56b638ae35230124f1be579026Ubuntu Security Notice 3061-1 - Eddie Harari discovered that OpenSSH incorrectly handled password hashing when authenticating non-existing users. A remote attacker could perform a timing attack and enumerate valid users. Tomas Kuthan, Andres Rojas, and Javier Nieto discovered that OpenSSH did not limit password lengths. A remote attacker could use this issue to cause OpenSSH to consume resources, leading to a denial of service. Various other issues were also addressed.
380999cba357e2595697463d6456f1f369ee299011b921357ee88539c371e7e6Slackware Security Advisory - New openssh packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix security issues.
a62b75c0b98708df6b67b42ecd69a4b38ea282554348408eaa42acff94fc34c5This is a Linux/portable port of OpenBSD's excellent OpenSSH. OpenSSH is based on the last free version of Tatu Ylonen's SSH with all patent-encumbered algorithms removed, all known security bugs fixed, new features reintroduced, and many other clean-ups.
efc912a2ef7e938fa36df6787cd9d21b45463cd4f9d70764e9e61a961786691bDebian Linux Security Advisory 3626-1 - Eddie Harari reported that the OpenSSH SSH daemon allows user enumeration through timing differences when trying to authenticate users. When sshd tries to authenticate a non-existing user, it will pick up a fixed fake password structure with a hash based on the Blowfish algorithm. If real users passwords are hashed using SHA256/SHA512, then a remote attacker can take advantage of this flaw by sending large passwords, receiving shorter response times from the server for non-existing users.
2f863fa4086db0a31226d56604fd7475efd80aac9d83230c52c988d3925ce6d0OpenSSHD versions 7.2p2 and below user enumeration exploit.
b69a28b747a4fe5a117cdc11aded97dd15df51cde6788bd96001aa8f57bc36a6
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