漏洞描述
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.
影响产品
修复建议
建议关注厂商安全公告，及时升级至已修复版本，并结合实际资产暴露情况采取缓解措施。
参考链接
www.securitytracker.comhttp://www.securitytracker.com/id/1036319↗www.openssh.comhttps://www.openssh.com/txt/release-7.3↗cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf↗seclists.orghttp://seclists.org/fulldisclosure/2016/Jul/51↗www.debian.orghttp://www.debian.org/security/2016/dsa-3626↗access.redhat.comhttps://access.redhat.com/errata/RHSA-2017:2563↗security.netapp.comhttps://security.netapp.com/advisory/ntap-20190206-0001/↗www.securityfocus.comhttp://www.securityfocus.com/bid/91812↗security.gentoo.orghttps://security.gentoo.org/glsa/201612-18↗access.redhat.comhttps://access.redhat.com/errata/RHSA-2017:2029↗