813672 – (CVE-2016-20012) net-misc/openssh: user enumeration if pubkey and user are known (CVE-2016-20012)

Bug 813672 (CVE-2016-20012) - net-misc/openssh: user enumeration if pubkey and user are known (CVE-2016-20012)

Summary: net-misc/openssh: user enumeration if pubkey and user are known (CVE-2016-20012)

Status:	RESOLVED UPSTREAM

Alias:	CVE-2016-20012

Product:	Gentoo Security
Classification:	Unclassified
Component:	Vulnerabilities (show other bugs)
Hardware:	All Linux

Importance:	Normal minor
Assignee:	Gentoo Security

URL:	https://github.com/openssh/openssh-po...
Whiteboard:	A4 [upstream]
Keywords:

Depends on:
Blocks:

Reported:	2021-09-18 17:39 UTC by John Helmert III
Modified:	2022-08-17 16:27 UTC (History)
CC List:	1 user (show)

See Also:
Package list:
Runtime testing required:	---

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.

Description John Helmert III archtester

2021-09-18 17:39:32 UTC

CVE-2016-20012:

OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session.

Potential patch: https://github.com/openssh/openssh-portable/pull/270

Comment 1 John Helmert III archtester

2022-08-17 16:27:54 UTC

Upstream says this won't be fixed in the near future.