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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: CONFIRMED
Alias: CVE-2016-20012
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal minor (vote)
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: 2021-09-18 17:39 UTC (History)
1 user (show)

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


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Description John Helmert III gentoo-dev Security 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