CVE-2019-16905 Information
Share on:Description
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 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Reference
https://0day.life/exploits/0day-1009.html https://bugzilla.suse.com/show_bug.cgi?id=1153537 https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c.diff?r1=1.5&r2=1.6&f=h https://security.gentoo.org/glsa/201911-01 https://security.netapp.com/advisory/ntap-20191024-0003/ https://ssd-disclosure.com/archives/4033/ssd-advisory-openssh-pre-auth-xmss-integer-overflow https://www.openssh.com/releasenotes.html https://www.openwall.com/lists/oss-security/2019/10/09/1
Attack Complexity
LOW
Privileges Required
LOW
User Interaction Required
LOW
Scope
NONE
Confidentiality Impact
UNCHANGED
Integrity Impact
HIGH
Availability Impact
HIGH
Base Score
HIGH
Base Severity
7.8