SSH: OpenSSH kbdint_next_device Policy Bypass
This signature detects attempts to exploit a code execution vulnerability in OpenSSH A successful attack can lead to policy bypass.
Extended 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.
Affected Products
Openbsd openssh
References
CVE: CVE-2015-5600
Short Name
SSH:KBDINT-NEXT-DEV-POL-BYPASS
Severity
Minor
Recommended
True
Recommended Action
Drop
Category
SSH
Keywords
Bypass CVE-2015-5600 OpenSSH Policy kbdint_next_device
Release Date
02/08/2016
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3337
False Positive
Unknown
Vendors
Openbsd
CVSS Score
8.5