Access Restriction Bypass

Affecting openssh package, versions <1:6.7p1-5+deb8u6

Report new vulnerabilities
Do your applications use this vulnerable package? Test your applications

Overview

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.

References

CVSS Score

8.2
high severity
  • Attack Vector
    Network
  • Attack Complexity
    Low
  • Privileges Required
    None
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    Low
  • Integrity
    None
  • Availability
    High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
CVE
CVE-2015-5600
CWE
CWE-264
Snyk ID
SNYK-DEBIAN8-OPENSSH-368745
Disclosed
03 Aug, 2015
Published
03 Aug, 2015