Integer Overflow or Wraparound The advisory has been revoked - it doesn't affect any version of package openssh (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1604-OPENSSH-612357
- published10 Sept 2020
- disclosed9 Oct 2019
Introduced: 9 Oct 2019
CVE-2019-16905 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:16.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by Ubuntu.
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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2019-16905
- https://security.netapp.com/advisory/ntap-20191024-0003/
- https://www.openssh.com/releasenotes.html
- https://www.openwall.com/lists/oss-security/2019/10/09/1
- https://security.gentoo.org/glsa/201911-01
- 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://ssd-disclosure.com/archives/4033/ssd-advisory-openssh-pre-auth-xmss-integer-overflow
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf