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CVE-2019-16905

Published: Oct 9, 2019

Modified: Apr 23, 2025

PUBLISHED

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.

Vendor	Product	Versions
n/a	n/a	affected `n/a`

References

https://www.openssh.com/releasenotes.html

https://www.openwall.com/lists/oss-security/2019/10/09/1

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://bugzilla.suse.com/show_bug.cgi?id=1153537

https://ssd-disclosure.com/archives/4033/ssd-advisory-openssh-pre-auth-xmss-integer-overflow

https://security.netapp.com/advisory/ntap-20191024-0003/

vendor-advisory

https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

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