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CVE-2016-6515

Status Candidate

Overview

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.

Related Files

HPE Security Bulletin HPESBHF03779 1
Posted Oct 24, 2017
Authored by Hewlett Packard Enterprise | Site hpe.com

HPE Security Bulletin HPESBHF03779 1 - A remotely exploitable denial of service vulnerability has been identified in HPE Fabric OS (FOS) running OpenSSH. This impacts versions prior to FOS v7.4.2. Revision 1 of this advisory.

tags | advisory, denial of service
advisories | CVE-2016-6515
SHA-256 | e2d2b9631edb30a7ff9049c57731463bbe76cb777245783bd044fe3d853f4acf
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
SHA-256 | d968f1977aa418a410f4eb0347eb315fb89ecda3c383e34f02b7ceef8867f98a
OpenSSH 7.2 Denial Of Service
Posted Dec 8, 2016
Authored by Kashinath T | Site secpod.com

OpenSSH versions 7.2 and below crypt CPU consumption denial of service exploit.

tags | exploit, denial of service
advisories | CVE-2016-6515
SHA-256 | 85813c4a45e54ff563c3ade3e42af0997614ba11790f829f24352c73b552928d
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
SHA-256 | 380999cba357e2595697463d6456f1f369ee299011b921357ee88539c371e7e6
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