Improper Input Validation Affecting openssh package, versions <0:7.4p1-11.68.amzn1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-AMZN201803-OPENSSH-1708417
- published27 Sept 2021
- disclosed7 Aug 2016
Introduced: 7 Aug 2016
CVE-2016-6515 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2018.03 openssh to version 0:7.4p1-11.68.amzn1 or higher.
This issue was patched in ALAS-2017-898.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2018.03 relevant fixed versions and status.
The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.
References
- http://www.securityfocus.com/bid/92212
- https://cert-portal.siemens.com/productcert/pdf/ssa-676336.pdf
- https://github.com/openssh/openssh-portable/commit/fcd135c9df440bcd2d5870405ad3311743d78d97
- https://security.netapp.com/advisory/ntap-20171130-0003/
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03779en_us
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6515
- https://www.exploit-db.com/exploits/40888/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X2L6RW34VFNXYNVVN2CN73YAGJ5VMTFU/
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:06.openssh.asc
- http://packetstormsecurity.com/files/140070/OpenSSH-7.2-Denial-Of-Service.html
- http://openwall.com/lists/oss-security/2016/08/01/2
- https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
- https://access.redhat.com/errata/RHSA-2017:2029
- http://www.securitytracker.com/id/1036487
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X2L6RW34VFNXYNVVN2CN73YAGJ5VMTFU/
- https://www.exploit-db.com/exploits/40888
- https://github.com/opsxcq/exploit-CVE-2016-6515