CVE-2019-16905

 

Published at: - 09-10-2019 10:15

Last modified: - 31-03-2022 08:10

Total changes: - 3

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

 

Verification logic

 

Reference

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

 

Keywords

NVD

 

CVE-2019-16905

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures