#VU22277 Integer overflow in OpenSSH - CVE-2019-16905
Published: October 24, 2019
Vulnerability identifier: #VU22277
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2019-16905
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
OpenSSH
OpenSSH
Software vendor:
OpenSSH
OpenSSH
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to integer overflow within the XMSS key parsing algorithm. A local user can configure the server or client to use a specially crafted XMSS private key, trigger integer overflow and execute arbitrary code on the target system with elevated privileges.
Remediation
Install updates from vendor's website.
External links
- https://0day.life/exploits/0day-1009.html
- https://bugzilla.suse.com/show_bug.cgi?id=1153537
- https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c
- https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c.diff?r1=1.5&r2=1.6&f=h
- https://security.netapp.com/advisory/ntap-20191024-0003/
- https://ssd-disclosure.com/archives/4033/ssd-advisory-openssh-pre-auth-xmss-integer-overflow
- https://www.openssh.com/releasenotes.html
- https://www.openwall.com/lists/oss-security/2019/10/09/1