CVE-2015-5600
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 1:6.9p1-1 |
| sid | Fixed | 1:6.9p1-1 |
| forky | Fixed | 1:6.9p1-1 |
| bullseye | Fixed | 1:6.9p1-1 |
| bookworm | Fixed | 1:6.9p1-1 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| openbsd | openssh | {"endIncluding":"6.9"} | |
References
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://www.ubuntu.com/usn/USN-2710-2
- http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128992
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- https://security.gentoo.org/glsa/201512-04
- https://kc.mcafee.com/corporate/index?page=content&id=SB10136
- https://security.netapp.com/advisory/ntap-20151106-0001/
- http://rhn.redhat.com/errata/RHSA-2016-0466.html
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42&r2=1.43&f=h
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10697
- http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c
- https://kc.mcafee.com/corporate/index?page=content&id=SB10157
- http://www.securityfocus.com/bid/75990
- http://www.securityfocus.com/bid/91787
- https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952480
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
- http://www.securityfocus.com/bid/92012
- https://support.apple.com/kb/HT205031
- https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
CWEs
CWE-264 CWE-400
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.