Rapid7 Vulnerability & Exploit Database

USN-2710-1: OpenSSH vulnerabilities

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USN-2710-1: OpenSSH vulnerabilities

Severity
9
CVSS
(AV:N/AC:L/Au:N/C:P/I:N/A:C)
Published
08/02/2015
Created
07/25/2018
Added
08/17/2015
Modified
07/09/2020

Description

The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.

Solution(s)

  • ubuntu-upgrade-openssh-server

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