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
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: 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, https://sunweavers.net/