| Description: | Summary:
The remote host is missing an update for the Debian 'openssh' package(s) announced via the DLA-1728-1 advisory.
Vulnerability Insight:
Multiple scp client vulnerabilities have been discovered in OpenSSH, the premier connectivity tool for secure remote shell login and secure file transfer.
CVE-2018-20685
In scp.c, the scp client allowed remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact was modifying the permissions of the target directory on the client side.
CVE-2019-6109
Due to missing character encoding in the progress display, a malicious server (or Man-in-The-Middle attacker) was able to employ crafted object names to manipulate the client output, e.g., by using ANSI control codes to hide additional files being transferred. This affected refresh_progress_meter() in progressmeter.c.
CVE-2019-6111
Due to the scp implementation being derived from 1983 rcp, the server chooses which files/directories are sent to the client. However, the scp client only performed cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious scp server (or Man-in-The-Middle attacker) was able to overwrite arbitrary files in the scp client target directory. If recursive operation (-r) was performed, the server was able to manipulate subdirectories, as well (for example, to overwrite the .ssh/authorized_keys file).
For Debian 8 Jessie, these problems have been fixed in version 1:6.7p1-5+deb8u8.
We recommend that you upgrade your openssh packages.
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: [link moved to references]
Affected Software/OS:
'openssh' package(s) on Debian 8.
Solution:
Please install the updated package(s).
CVSS Score:
5.8
CVSS Vector:
AV:N/AC:M/Au:N/C:N/I:P/A:P
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