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[SECURITY] [DLA 1728-1] openssh security update

Package        : openssh
Version        : 1:6.7p1-5+deb8u8
CVE ID         : CVE-2018-20685 CVE-2019-6109 CVE-2019-6111
Debian Bug     : 793412 919101 923486

Multiple scp client vulnerabilities have been discovered in OpenSSH, the
premier connectivity tool for secure remote shell login and secure file


    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.


    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.


    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

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: https://wiki.debian.org/LTS


mike gabriel aka sunweaver (Debian Developer)
fon: +49 (1520) 1976 148

GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22  0782 9AF4 6B30 2577 1B31
mail: sunweaver@debian.org, http://sunweavers.net

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