Goldstein Lyor created SSHD-925:
-----------------------------------
Summary: 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
>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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