Improper Input Validation Affecting openssh-server-sysvinit package, versions <0:7.4p1-11.el7
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-ORACLE7-OPENSSHSERVERSYSVINIT-2516142
- published10 Apr 2022
- disclosed7 Aug 2016
Introduced: 7 Aug 2016
CVE-2016-6515 (opens in a new tab)How to fix?
Upgrade Oracle:7 openssh-server-sysvinit to version 0:7.4p1-11.el7 or higher.
This issue was patched in ELSA-2017-2029.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openssh-server-sysvinit package and not the openssh-server-sysvinit package as distributed by Oracle.
See How to fix? for Oracle:7 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
- https://linux.oracle.com/cve/CVE-2016-6515.html
- https://linux.oracle.com/errata/ELSA-2017-2029.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X2L6RW34VFNXYNVVN2CN73YAGJ5VMTFU/
- http://openwall.com/lists/oss-security/2016/08/01/2
- http://packetstormsecurity.com/files/140070/OpenSSH-7.2-Denial-Of-Service.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://www.securityfocus.com/bid/92212
- http://www.securitytracker.com/id/1036487
- https://access.redhat.com/errata/RHSA-2017:2029
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-676336.pdf
- https://github.com/openssh/openssh-portable/commit/fcd135c9df440bcd2d5870405ad3311743d78d97
- https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X2L6RW34VFNXYNVVN2CN73YAGJ5VMTFU/
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:06.openssh.asc
- https://security.netapp.com/advisory/ntap-20171130-0003/
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03779en_us
- https://www.exploit-db.com/exploits/40888/
- https://www.exploit-db.com/exploits/40888
- https://github.com/opsxcq/exploit-CVE-2016-6515