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<define-tag description>LTS security update</define-tag>
<define-tag moreinfo>
<p>Multiple scp client vulnerabilities have been discovered in OpenSSH, the
premier connectivity tool for secure remote shell login and secure file
transfer.</p>
<ul>
<li><a href="https://security-tracker.debian.org/tracker/CVE-2018-20685">CVE-2018-20685</a>
<p>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.</p></li>
<li><a href="https://security-tracker.debian.org/tracker/CVE-2019-6109">CVE-2019-6109</a>
<p>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.</p></li>
<li><a href="https://security-tracker.debian.org/tracker/CVE-2019-6111">CVE-2019-6111</a>
<p>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).</p></li>
</ul>
<p>For Debian 8 <q>Jessie</q>, these problems have been fixed in version
1:6.7p1-5+deb8u8.</p>
<p>We recommend that you upgrade your openssh packages.</p>
<p>Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: <a href="https://wiki.debian.org/LTS">https://wiki.debian.org/LTS</a></p>
</define-tag>
# do not modify the following line
#include "$(ENGLISHDIR)/lts/security/2019/dla-1728.data"
# $Id: $
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