High severity · published Aug 3, 2015
CVE-2015-5600
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…
8.1
CVSS
9.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)9.4% · higher than 95% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
Openssh · Openbsd
through 6.9 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2015-5600
CVE.org
https://www.cve.org/CVERecord?id=CVE-2015-5600
cvsweb.openbsd.org
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c
cvsweb.openbsd.org
http://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
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10697
lists.apple.com
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
lists.fedoraproject.org
http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
lists.fedoraproject.org
http://lists.fedoraproject.org/pipermail/package-announce/2015-July/162955.html
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