Bug 2048523 (CVE-2016-20012) - CVE-2016-20012 openssh: Public key information leak
Summary: CVE-2016-20012 openssh: Public key information leak
Alias: CVE-2016-20012
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 2056666 2056667 2056817
Blocks: 2048524
TreeView+ depends on / blocked
Reported: 2022-01-31 12:41 UTC by Pedro Sampaio
Modified: 2022-03-16 19:06 UTC (History)
12 users (show)

Fixed In Version:
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Last Closed: 2022-03-16 19:06:38 UTC

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Description Pedro Sampaio 2022-01-31 12:41:06 UTC
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.



Comment 1 juneau 2022-01-31 17:09:58 UTC
Marking Services affected/delegated for presence of the affected code. Minimal likelihood of exploit.

Comment 4 Marco Benatto 2022-02-21 18:58:12 UTC
Marking RHEL8 and RHEL9 as delegated as the code is present, however upstream seems to not recognize this as a vulnerability although it has a CVE ID assigned. Also it seems there's no fix present in upstream as the pull request seems to be open and in draft state yet.

Comment 5 Avinash Hanwate 2022-02-22 06:02:42 UTC
Created openssh tracking bugs for this issue:

Affects: fedora-all [bug 2056817]

Comment 9 Marco Benatto 2022-03-16 19:06:38 UTC
Closing this as NOTABUG as upstream and Red Hat doesn't consider it to be a security vulnerability.

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