Vulnerability Monitor

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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.

Published

2019-10-09T20:15:23.503

Last Modified

2025-04-23T16:15:20.437

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.8 (HIGH)

CVSSv2 Vector

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

Access Vector: LOCAL
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

3.4

Impact Score

6.4

Weaknesses

Type: Primary
CWE-190

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	openbsd	openssh	≤ 7.9	Yes
Application	openbsd	openssh	< 8.1	Yes
Application	netapp	cloud_backup	-	Yes
Application	netapp	steelstore_cloud_integrated_storage	-	Yes
Operating System	siemens	scalance_x204rna_firmware	< 3.2.7	Yes
Hardware	siemens	scalance_x204rna	-	No
Operating System	siemens	scalance_x204rna_ecc_firmware	< 3.2.7	Yes
Hardware	siemens	scalance_x204rna_ecc	-	No

References

https://bugzilla.suse.com/show_bug.cgi?id=1153537 Issue Tracking, Third Party Advisory ([email protected])
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf Third Party Advisory ([email protected])
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c Release Notes, Vendor Advisory ([email protected])
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c.diff?r1=1.5&r2=1.6&f=h Patch ([email protected])
https://security.gentoo.org/glsa/201911-01 Third Party Advisory ([email protected])
https://security.netapp.com/advisory/ntap-20191024-0003/ Third Party Advisory ([email protected])
https://ssd-disclosure.com/archives/4033/ssd-advisory-openssh-pre-auth-xmss-integer-overflow Exploit, Third Party Advisory ([email protected])
https://www.openssh.com/releasenotes.html Release Notes ([email protected])
https://www.openwall.com/lists/oss-security/2019/10/09/1 Mailing List, Third Party Advisory ([email protected])
https://bugzilla.suse.com/show_bug.cgi?id=1153537 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c.diff?r1=1.5&r2=1.6&f=h Patch (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/201911-01 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20191024-0003/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://ssd-disclosure.com/archives/4033/ssd-advisory-openssh-pre-auth-xmss-integer-overflow Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.openssh.com/releasenotes.html Release Notes (af854a3a-2127-422b-91ae-364da2661108)
https://www.openwall.com/lists/oss-security/2019/10/09/1 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)