Bug 1153537 – VUL-1: CVE-2019-16905: openssh: 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

Bug 1153537 - (CVE-2019-16905) VUL-1: CVE-2019-16905: openssh: 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

(CVE-2019-16905)
Summary:	VUL-1: CVE-2019-16905: openssh: when compiled with an experimental key type, ...

Status:	RESOLVED INVALID

Classification:	Novell Products
Product:	SUSE Security Incidents
Classification:	Novell Products
Component:	Incidents
Version:	unspecified
Hardware:	Other Other

Priority:	P5 - None Severity: Minor
Target Milestone:	---
Assigned To:	Hans Petter Jansson
QA Contact:	Security Team bot

URL:	https://smash.suse.de/issue/244561/
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Reported:	2019-10-10 08:03 UTC by Robert Frohl
Modified:	2019-10-10 08:11 UTC (History)
CC List:	1 user (show)

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Found By:	Security Response Team
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Description Robert Frohl 2019-10-10 08:03:39 UTC

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 remote
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.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-16905
https://www.openwall.com/lists/oss-security/2019/10/09/1
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-16905
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.openssh.com/releasenotes.html

Comment 1 Robert Frohl 2019-10-10 08:11:11 UTC

Only codestreams where we could be affected is SUSE:SLE-15-SP1:Update and openSUSE. But the algorithm was not enabled there. 

Which means we are not affected anywhere as far as I can tell.