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CVE-2016-6210

Status Candidate

Overview

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.

Related Files

Red Hat Security Advisory 2017-2563-01
Posted Aug 31, 2017
Authored by Red Hat | Site access.redhat.com

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.

tags | advisory, remote, protocol
systems | linux, redhat, unix
advisories | CVE-2016-6210
MD5 | 8a4849c1f8b09539436d05406ea362fc
Red Hat Security Advisory 2017-2029-01
Posted Aug 2, 2017
Authored by Red Hat | Site access.redhat.com

Red 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.

tags | advisory, remote, protocol
systems | linux, redhat, unix
advisories | CVE-2016-10009, CVE-2016-10011, CVE-2016-10012, CVE-2016-6210, CVE-2016-6515
MD5 | 4f8a28af393580faadbb14af7cbc682c
Gentoo Linux Security Advisory 201612-18
Posted Dec 7, 2016
Authored by Gentoo | Site security.gentoo.org

Gentoo 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.

tags | advisory, remote, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2015-8325, CVE-2016-1908, CVE-2016-3115, CVE-2016-6210, CVE-2016-8858
MD5 | 041aca8f0a2d23672cf4c61f7d77c8e9
Ubuntu Security Notice USN-3061-1
Posted Aug 15, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu 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.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2016-6210, CVE-2016-6515
MD5 | 6cd4c17a7cea97f346989d636afe8d94
Slackware Security Advisory - openssh Updates
Posted Aug 8, 2016
Authored by Slackware Security Team | Site slackware.com

Slackware 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.

tags | advisory
systems | linux, slackware
advisories | CVE-2015-8325, CVE-2016-6210
MD5 | 91ebe4bcf46b5016c7435e088fa5b034
OpenSSH 7.3p1
Posted Aug 2, 2016
Authored by Damien Miller | Site openssh.com

This 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.

Changes: Multiple updates including a security fix.
tags | tool, encryption
systems | linux, unix, openbsd
advisories | CVE-2016-6210
MD5 | 4d88194aa227646df970e71a08943de5
Debian Security Advisory 3626-1
Posted Jul 24, 2016
Authored by Debian | Site debian.org

Debian 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.

tags | advisory, remote
systems | linux, debian
advisories | CVE-2016-6210
MD5 | dc3faadecac3dfbdee44388e628d3668
OpenSSHD 7.2p2 User Enumeration
Posted Jul 18, 2016
Authored by Eddie Harari

OpenSSHD versions 7.2p2 and below user enumeration exploit.

tags | exploit
advisories | CVE-2016-6210
MD5 | 777a925c5777b02e834669f4dea7d5ca
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