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Debian Security Advisory DSA-4387-1 security@debian.org
https://www.debian.org/security/ Yves-Alexis Perez
February 09, 2019 https://www.debian.org/security/faq
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Package : openssh
CVE ID : CVE-2018-20685 CVE-2019-6109 CVE-2019-6111
Debian Bug : 793412 919101

Harry Sintonen from F-Secure Corporation discovered multiple vulnerabilities in
OpenSSH, an implementation of the SSH protocol suite. All the vulnerabilities
are in found in the scp client implementing the SCP protocol.

CVE-2018-20685

Due to improper directory name validation, the scp client allows servers to
modify permissions of the target directory by using empty or dot directory
name.

CVE-2019-6109

Due to missing character encoding in the progress display, the object name
can be used to manipulate the client output, for example to employ ANSI
codes to hide additional files being transferred.

CVE-2019-6111

Due to scp client insufficient input validation in path names sent by
server, a malicious server can do arbitrary file overwrites in target
directory. If the recursive (-r) option is provided, the server can also
manipulate subdirectories as well.
.
The check added in this version can lead to regression if the client and
the server have differences in wildcard expansion rules. If the server is
trusted for that purpose, the check can be disabled with a new -T option to
the scp client.

For the stable distribution (stretch), these problems have been fixed in
version 1:7.4p1-10+deb9u5.

We recommend that you upgrade your openssh packages.

For the detailed security status of openssh please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/openssh

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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