PRIOn knowledge basePRION:CVE-2015-5600Design/Logic Flaw
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
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.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
www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
www.securityfocus.com/bid/75990
www.securityfocus.com/bid/91787
www.securityfocus.com/bid/92012
www.securitytracker.com/id/1032988
www.ubuntu.com/usn/USN-2710-1
www.ubuntu.com/usn/USN-2710-2
cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952480
h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128992
h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667
kc.mcafee.com/corporate/index?page=content&id=SB10136
kc.mcafee.com/corporate/index?page=content&id=SB10157
lists.debian.org/debian-lts-announce/2018/09/msg00010.html
lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
lists.fedoraproject.org/pipermail/package-announce/2015-July/162955.html
security.gentoo.org/glsa/201512-04
security.netapp.com/advisory/ntap-20151106-0001/
support.apple.com/kb/HT205031
www.arista.com/en/support/advisories-notices/security-advisories/1174-security-advisory-12
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