CVE-2018-15473

medium

Published — · Modified —

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CVSS v3

—

CVSS v4 NEW

—

not yet in upstream

VIR risk

6.5

Description

OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c.

Predictions

Exploit likelihood

90%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-45233 remote linux verified

Justin Gardner · 2018-08-21

OpenSSH 2.3 < 7.7 - Username Enumeration

Source code queued for fetch — refresh in a moment.

EDB-45210 remote linux verified

Matthew Daley · 2018-08-16

OpenSSH 2.3 < 7.7 - Username Enumeration (PoC)

Source code queued for fetch — refresh in a moment.

EDB-45939 remote linux

Leap Security · 2018-12-04

OpenSSH < 7.7 - User Enumeration (2)

Source code queued for fetch — refresh in a moment.

Metasploit modules

auxiliary_scanner/ssh/ssh_enumusers rank 300

SSH Username Enumeration

Source code queued for fetch — refresh in a moment.

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`7.8p1-1`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`1:7.7p1-4`
sid	Fixed	`1:7.7p1-4`
forky	Fixed	`1:7.7p1-4`
bullseye	Fixed	`1:7.7p1-4`
bookworm	Fixed	`1:7.7p1-4`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.