CVE-2015-5600

Originalbeschreibung

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.

Betroffene Software

• OpenSSH ≤ 6.9 exakte Übereinstimmung

Details

Veröffentlicht

2015-08-03

Zuletzt geändert

2026-06-17

CVSS-Vektor

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-264, CWE-400

Referenzen

• cve.org/CVE-2015-5600
• nvd.nist.gov/vuln/detail/CVE-2015-5600
• cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c
• cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42&r2=1.43&f=h
• kb.juniper.net/InfoCenter/index?page=content&id=JSA10697
• lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
• lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
• lists.fedoraproject.org/pipermail/package-announce/2015-July/162955.html
• lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
• openwall.com/lists/oss-security/2015/07/23/4
• rhn.redhat.com/errata/RHSA-2016-0466.html
• seclists.org/fulldisclosure/2015/Jul/92
• www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
• www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html