Covert Timing Channel Affecting openssh-server package, versions <0:7.4p1-11.el7
Threat Intelligence
Snyk has a published code exploit for 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-RHEL7-OPENSSHSERVER-4709919
- published26 Jul 2021
- disclosed14 Jul 2016
Introduced: 14 Jul 2016
CVE-2016-6210 (opens in a new tab)How to fix?
Upgrade RHEL:7 openssh-server to version 0:7.4p1-11.el7 or higher.
This issue was patched in RHSA-2017:2029.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openssh-server package and not the openssh-server package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided.
References
- http://www.securityfocus.com/bid/91812
- https://security.netapp.com/advisory/ntap-20190206-0001/
- https://www.openssh.com/txt/release-7.3
- https://access.redhat.com/security/cve/CVE-2016-6210
- http://www.debian.org/security/2016/dsa-3626
- https://www.exploit-db.com/exploits/40113/
- https://www.exploit-db.com/exploits/40136/
- http://seclists.org/fulldisclosure/2016/Jul/51
- https://security.gentoo.org/glsa/201612-18
- https://access.redhat.com/errata/RHSA-2017:2029
- http://www.securitytracker.com/id/1036319
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://www.exploit-db.com/exploits/40136