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From "Goldstein Lyor (Jira)" <j...@apache.org>
Subject [jira] [Resolved] (SSHD-925) See if SCP vulnerability CVE-2019-6111 applies and mitigate it if so
Date Tue, 20 Aug 2019 12:47:00 GMT

     [ https://issues.apache.org/jira/browse/SSHD-925?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Goldstein Lyor resolved SSHD-925.
    Resolution: Not A Problem

> See if SCP vulnerability CVE-2019-6111 applies and mitigate it if so
> --------------------------------------------------------------------
>                 Key: SSHD-925
>                 URL: https://issues.apache.org/jira/browse/SSHD-925
>             Project: MINA SSHD
>          Issue Type: Improvement
>    Affects Versions: 2.2.0
>            Reporter: Goldstein Lyor
>            Assignee: Goldstein Lyor
>            Priority: Major
>              Labels: scp, security-issue
> From [OpenSSH version 8.0 release notes|https://www.openssh.com/txt/release-8.0]
> {quote}
> This release contains mitigation for a weakness in the scp(1) tool and protocol (CVE-2019-6111):
when copying files from a remote system to a local directory, scp(1) did not verify that the
filenames that the server sent matched those requested by the client. This could allow a hostile
server to create or clobber unexpected local files with attacker-controlled content.
> {quote}
> If indeed this vulnerability exists then also note the following
> {quote}
> The scp protocol relies on the remote shell for wildcard expansion, so there is no infallible
way for the client's wildcard matching to perfectly reflect the server's. If there is a difference
between client and server wildcard expansion, the client may refuse files from the server.
For this reason, we have provided a new "-T" flag to scp that disables these client-side checks
at the risk of reintroducing the attack described above.
> {quote}

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