Vulnerability Details : 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.

Vulnerability category: OverflowMemory Corruption

Published 2019-10-09 20:15:24

Updated 2023-03-01 01:56:11

Source MITRE

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2019-16905

Probability of exploitation activity in the next 30 days: 0.05%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 15 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2019-16905

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
4.4	MEDIUM	AV:L/AC:M/Au:N/C:P/I:P/A:P	3.4	6.4	[email protected]
Access Vector: Local Access Complexity: Medium Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
7.8	HIGH	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	1.8	5.9	[email protected]
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2019-16905

CWE-190 Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.

Assigned by: [email protected] (Primary)

References for CVE-2019-16905

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

Mailing List;Third Party Advisory
https://security.netapp.com/advisory/ntap-20191024-0003/

Third Party Advisory
https://0day.life/exploits/0day-1009.html

Exploit;Third Party Advisory
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c.diff?r1=1.5&r2=1.6&f=h

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

Exploit;Third Party Advisory
https://security.gentoo.org/glsa/201911-01

Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1153537

Issue Tracking;Third Party Advisory
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c

Release Notes;Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

Third Party Advisory

CVEs referencing this url
https://www.openssh.com/releasenotes.html

Release Notes

CVEs referencing this url

Products affected by CVE-2019-16905

Openbsd » Openssh
Versions from including (>=) 7.7 and up to, including, (<=) 7.9
cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
Matching versions
Openbsd » Openssh
Versions from including (>=) 8.0 and before (<) 8.1
cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
Matching versions
Siemens » Scalance X204rna Firmware
Versions before (<) 3.2.7
cpe:2.3:o:siemens:scalance_x204rna_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Siemens » Scalance X204rna » Version: N/A
Siemens » Scalance X204rna Ecc Firmware
Versions before (<) 3.2.7
cpe:2.3:o:siemens:scalance_x204rna_ecc_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Siemens » Scalance X204rna Ecc » Version: N/A
Netapp » Cloud Backup » Version: N/A
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
Matching versions
Netapp » Steelstore Cloud Integrated Storage » Version: N/A
cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:*
Matching versions