CVE-2015-5600

High

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.

SeverityHigh

CVSS8.1

Exploit probability—

ProductOpenbsd Openssh

PublishedAug 3, 2015

First seenAug 3, 2015

Weakness typeCWE-400Uncontrolled resource consumption

How to fix

Vendor advisories

security.gentoo.org/glsa/201512-04

Affected products

Product	Affected versions	Fixed in
openbsd openssh	v ≤ 6.9	—

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