Description
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.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Exploits & PoCs
- nucleiOpenSSH Service - Detectby r3dg33k,daffainfo,iamthefrogy
- nucleiMikroTik RouterOS SSH - Detectby staticnoise
References
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2017:2563
- MISChttp://www.securitytracker.com/id/1036319
- MAILING_LISThttp://seclists.org/fulldisclosure/2016/Jul/51
- VENDOR_ADVISORYhttp://www.debian.org/security/2016/dsa-3626
- EXPLOIThttps://www.exploit-db.com/exploits/40136/
- EXPLOIThttps://www.exploit-db.com/exploits/40113/
- MISChttps://www.openssh.com/txt/release-7.3
- MISChttps://security.gentoo.org/glsa/201612-18
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2017:2029
- MISChttp://www.securityfocus.com/bid/91812
- MISChttps://security.netapp.com/advisory/ntap-20190206-0001/
- MISChttps://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf