User Enumeration Vulnerability in OpenSSH Affected by Multiple Versions
CVE-2018-15473

5.3MEDIUM

Key Information:

Vendor
OpenBSD
Status
Openssh
Vendor
CVE Published:
17 August 2018

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 90%

Summary

OpenSSH versions up to 7.7 are affected by a user enumeration flaw that allows attackers to potentially identify valid usernames. This vulnerability arises from insufficient delay mechanisms for invalid authentication attempts, particularly during the parsing of requests in the user authentication process. Attackers can exploit this vulnerability to gather user account information, thereby facilitating further attacks.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2018-15473-Exploit
Created by Rhynorater

massh-enum
Created by trimstray

cve-2018-15473
Created by epi052

References

https://security.gentoo.org/glsa/201810-03
vendor-advisory
http://www.securitytracker.com/id/1041487
vdb-entry
https://www.exploit-db.com/exploits/45233/
exploit

EPSS Score

90% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.