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CVE-2015-5600

8.1 · HIGH

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…

Published Aug 3, 2015openbsdCWE-264EPSS 9.38%

Overview

CVE-2015-5600 is a high-severity vulnerability affecting openbsd openssh. It was published on August 3, 2015 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from openbsd. Update openssh to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
openbsdopenssh0Affected

References

Refcvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.cRefcvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42&r2=1.43&f=hRefkb.juniper.net/InfoCenter/index?page=content&id=JSA10697Reflists.apple.com/archives/security-announce/2015/Aug/msg00001.htmlReflists.fedoraproject.org/pipermail/package-announce/2015-August/165170.htmlReflists.fedoraproject.org/pipermail/package-announce/2015-July/162955.htmlReflists.opensuse.org/opensuse-security-announce/2015-09/msg00017.htmlRefopenwall.com/lists/oss-security/2015/07/23/4Refrhn.redhat.com/errata/RHSA-2016-0466.htmlRefseclists.org/fulldisclosure/2015/Jul/92

How CyberStrike helps

Frequently asked questions

What is CVE-2015-5600?

CVE-2015-5600 is a high-severity vulnerability affecting openbsd openssh. It was published on August 3, 2015 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2015-5600?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2015-5600?

Check the references section for vendor advisories and patches from openbsd. Update openssh to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2015-5600?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-5600 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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