CVE-2019-16905

OpenSSH 7.7 through 7.9 and 8.x before 8.1, when compiled with an experimental key type, has a pre-authentication integer overflow if a client or server is configured to use a crafted XMSS key. This leads to memory corruption and local code execution because of an error in the XMSS key parsing algorithm. NOTE: the XMSS implementation is considered experimental in all released OpenSSH versions, and there is no supported way to enable it when building portable OpenSSH.

CVSS v3.0 7.8 HIGH
CVSS v2.0 4.4 MEDIUM

7.8^/10

CVSS v3.0 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

4.4^/10

CVSS v2.0 : MEDIUM

Vector : AV:L/AC:M/Au:N/C:P/I:P/A:P

Exploitability : 3.4 / Impact : 6.4

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c.diff?r1=1.5&r2=1.6&f=h	Patch
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c	Vendor Advisory
https://www.openwall.com/lists/oss-security/2019/10/09/1	Mailing List Third Party Advisory
https://www.openssh.com/releasenotes.html	Release Notes
https://bugzilla.suse.com/show_bug.cgi?id=1153537	Issue Tracking Third Party Advisory
https://0day.life/exploits/0day-1009.html	Exploit Third Party Advisory
https://ssd-disclosure.com/archives/4033/ssd-advisory-openssh-pre-auth-xmss-integer-overflow
https://security.netapp.com/advisory/ntap-20191024-0003/
https://security.gentoo.org/glsa/201911-01

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:openbsd:openssh::::::::
	cpe:2.3:a:openbsd:openssh::::::::

Information

Published : 2019-10-09 20:15

Updated : 2021-07-21 11:39

NVD link : CVE-2019-16905

Mitre link : CVE-2019-16905

JSON object : View

Products Affected

openbsd

openssh

CWE

CWE-190

Integer Overflow or Wraparound

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