CVE-2015-5600 json
The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-inter…
published 11y ago modified 4mo ago also EUVD-2015-5554
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 9.4%
- EPSS 9.4% chance of exploitation in 30 days, percentile 95%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- openssh Debian 14, Debian 13, Debian 12 1:6.9p1-1
debian advisories DEBIAN-CVE-2015-5600
- openssh Ubuntu 14.04 LTS 1:6.6p1-2ubuntu2.2
ubuntu advisories UBUNTU-CVE-2015-5600
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- openssh RHEL 6 5.3p1-114.el6_7
- openssh-ldap RHEL 6 5.3p1-114.el6_7
- openssh-server RHEL 6 5.3p1-114.el6_7
- openssh-askpass RHEL 6 5.3p1-114.el6_7
- openssh-clients RHEL 6 5.3p1-114.el6_7
- pam_ssh_agent_auth RHEL 6 0.9.3-114.el6_7
- openssh RHEL 7 6.6.1p1-22.el7
- openssh-ldap RHEL 7 6.6.1p1-22.el7
red hat advisories RHSA-2016:0466RHSA-2015:2088
- openssh SLES for SAP 11 SP4, SLES 11 SP4, SLED 11 SP4 6.6p1-13.1
- openssh-askpass-gnome SLES for SAP 11 SP4, SLES 11 SP4, SLED 11 SP4 6.6p1-13.3
- openssh SLES for SAP 11 SP3, SLES 11 SP3-TERADATA, SLES 11 SP3 +1 more 6.2p2-0.21.1
- openssh-askpass-gnome SLES for SAP 11 SP3, SLES 11 SP3-TERADATA, SLES 11 SP3 +1 more 6.2p2-0.21.3
- openssh SLES for SAP 12, SLES 12, SLED 12 6.6p1-29.1
- openssh-askpass-gnome SLES for SAP 12, SLES 12, SLED 12 6.6p1-29.1
- openssh SLES 11 SP2-LTSS 5.1p1-41.69.1
- openssh-askpass-gnome SLES 11 SP2-LTSS 5.1p1-41.69.4
suse advisories SUSE-SU-2015:1840-1SUSE-SU-2015:1695-1SUSE-SU-2015:1581-1SUSE-SU-2015:1544-1
Is CVE-2015-5600 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2015-5600 updated cvss 4.3
openssh: MaxAuthTries limit bypass via duplicates in KbdInteractiveDevices
-
Red Hat Enterprise Linux 4 openssh Red Hat Enterprise Linux 5 opensshaffected: workaround, no fix planned “Will not fix”
-
Red Hat Enterprise Linux Client (v. 7) openssh 6.6.1p1-22.el7, openssh-keycat 6.6.1p1-22.el7, openssh-server 6.6.1p1-22.el7, openssh-askpass 6.6.1p1-22.el7, openssh-clients 6.6.1p1-22.el7 Red Hat Enterprise Linux Client Optional (v. 7) openssh-ldap 6.6.1p1-22.el7, pam_ssh_agent_auth 0.9.3-9.22.el7, openssh-server-sysvinit 6.6.1p1-22.el7 Red Hat Enterprise Linux ComputeNode (v. 7) openssh 6.6.1p1-22.el7, openssh-keycat 6.6.1p1-22.el7, openssh-server 6.6.1p1-22.el7, openssh-clients 6.6.1p1-22.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) openssh-ldap 6.6.1p1-22.el7, openssh-askpass 6.6.1p1-22.el7, pam_ssh_agent_auth 0.9.3-9.22.el7, openssh-server-sysvinit 6.6.1p1-22.el7fixed: vendor fix RHSA-2015:2088
-
Red Hat Enterprise Linux Desktop (v. 6) openssh 5.3p1-114.el6_7, openssh-server 5.3p1-114.el6_7, openssh-askpass 5.3p1-114.el6_7, openssh-clients 5.3p1-114.el6_7 Red Hat Enterprise Linux Desktop Optional (v. 6) openssh-ldap 5.3p1-114.el6_7, pam_ssh_agent_auth 0.9.3-114.el6_7 Red Hat Enterprise Linux HPC Node (v. 6) openssh 5.3p1-114.el6_7, openssh-server 5.3p1-114.el6_7, openssh-clients 5.3p1-114.el6_7 Red Hat Enterprise Linux HPC Node Optional (v. 6) openssh-ldap 5.3p1-114.el6_7, openssh-askpass 5.3p1-114.el6_7, pam_ssh_agent_auth 0.9.3-114.el6_7 Red Hat Enterprise Linux Server (v. 6) openssh 5.3p1-114.el6_7, openssh-server 5.3p1-114.el6_7, openssh-askpass 5.3p1-114.el6_7, openssh-clients 5.3p1-114.el6_7fixed: vendor fix RHSA-2016:0466
-
Red Hat Enterprise Linux Server (v. 7) openssh 6.6.1p1-22.el7, openssh-keycat 6.6.1p1-22.el7, openssh-server 6.6.1p1-22.el7, openssh-askpass 6.6.1p1-22.el7, openssh-clients 6.6.1p1-22.el7fixed: vendor fix RHSA-2015:2088
-
Red Hat Enterprise Linux Server Optional (v. 6) openssh-ldap 5.3p1-114.el6_7, pam_ssh_agent_auth 0.9.3-114.el6_7fixed: vendor fix RHSA-2016:0466
-
Red Hat Enterprise Linux Server Optional (v. 7) openssh-ldap 6.6.1p1-22.el7, openssh-askpass 6.6.1p1-22.el7, pam_ssh_agent_auth 0.9.3-9.22.el7, openssh-server-sysvinit 6.6.1p1-22.el7fixed: vendor fix RHSA-2015:2088
-
Red Hat Enterprise Linux Workstation (v. 6) openssh 5.3p1-114.el6_7, openssh-server 5.3p1-114.el6_7, openssh-askpass 5.3p1-114.el6_7, openssh-clients 5.3p1-114.el6_7fixed: vendor fix RHSA-2016:0466
-
Red Hat Enterprise Linux Workstation (v. 7) openssh 6.6.1p1-22.el7, openssh-keycat 6.6.1p1-22.el7, openssh-server 6.6.1p1-22.el7, openssh-askpass 6.6.1p1-22.el7, openssh-clients 6.6.1p1-22.el7fixed: vendor fix RHSA-2015:2088
show 2 moreshow fewer
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Red Hat Enterprise Linux Workstation Optional (v. 6) openssh-ldap 5.3p1-114.el6_7, pam_ssh_agent_auth 0.9.3-114.el6_7fixed: vendor fix RHSA-2016:0466
-
Red Hat Enterprise Linux Workstation Optional (v. 7) openssh-ldap 6.6.1p1-22.el7, pam_ssh_agent_auth 0.9.3-9.22.el7, openssh-server-sysvinit 6.6.1p1-22.el7fixed: vendor fix RHSA-2015:2088
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
cisa ICSA-22-349-21 updated cvss 8.2
Siemens SCALANCE X-200RNA Switch Devices
-
Siemens SCALANCE X204RNA (HSR) (6GK5204-0BA00-2MB2) <V3.2.7 Siemens SCALANCE X204RNA (PRP) (6GK5204-0BA00-2KB2) <V3.2.7 Siemens SCALANCE X204RNA EEC (HSR) (6GK5204-0BS00-2NA3) <V3.2.7 Siemens SCALANCE X204RNA EEC (PRP) (6GK5204-0BS00-3LA3) <V3.2.7 Siemens SCALANCE X204RNA EEC (PRP/HSR) (6GK5204-0BS00-3PA3) <V3.2.7affected: fixed in V3.2.7, mitigation support.industry.siemens.com
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5mo ago
Exploit prediction
9.38% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- seclists.org http://seclists.org/fulldisclosure/2015/Jul/92 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 8.5 | AV:N/AC:L/Au:N/C:P/I:N/A:C |
Classification
References
-
seclists.org
/fulldisclosure/2015/Jul/92
mailing-list, exploit
-
ubuntu.com
/usn/USN-2710-2
vendor-advisory
-
lists.fedoraproject.org
/pipermail/package-announce/2015-August/165170.html
vendor-advisory
-
security.gentoo.org
/glsa/201512-04
vendor-advisory
-
rhn.redhat.com
/errata/RHSA-2016-0466.html
vendor-advisory
-
lists.apple.com
/archives/security-announce/2015/Aug/msg00001.html
vendor-advisory
-
lists.opensuse.org
/opensuse-security-announce/2015-09/msg00017.html
vendor-advisory
-
ubuntu.com
/usn/USN-2710-1
vendor-advisory
-
lists.fedoraproject.org
/pipermail/package-announce/2015-July/162955.html
vendor-advisory
- oracle.com /technetwork/topics/security/ovmbulletinjul2016-3090546.html
- oracle.com /technetwork/security-advisory/cpujul2018-4258247.html
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128992
- oracle.com /technetwork/topics/security/linuxbulletinapr2016-2952096.html
- oracle.com /technetwork/security-advisory/cpujul2016-2881720.html
- kc.mcafee.com /corporate/index?page=content&id=SB10136
- security.netapp.com /advisory/ntap-20151106-0001/
- cvsweb.openbsd.org /cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42&r2=1.43&f=h
- oracle.com /technetwork/topics/security/linuxbulletinoct2015-2719645.html
- kb.juniper.net /InfoCenter/index?page=content&id=JSA10697
- cvsweb.openbsd.org /cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c
- kc.mcafee.com /corporate/index?page=content&id=SB10157
-
securityfocus.com
/bid/75990
vdb-entry
-
securityfocus.com
/bid/91787
vdb-entry
- h20564.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952480
-
securityfocus.com
/bid/92012
vdb-entry
- support.apple.com /kb/HT205031
-
lists.debian.org
/debian-lts-announce/2018/09/msg00010.html
mailing-list
-
openwall.com
/lists/oss-security/2015/07/23/4
mailing-list
-
securitytracker.com
/id/1032988
vdb-entry
- oracle.com /technetwork/topics/security/bulletinoct2015-2511968.html
- arista.com /en/support/advisories-notices/security-advisories/1174-security-advisory-12
- cert-portal.siemens.com /productcert/pdf/ssa-412672.pdf
Sources
- CVE List CVE-2015-5600
- NVD CVE-2015-5600
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.