Debian: DSA-4387-1: openssh security update

    Date09 Feb 2019
    CategoryDebian
    3199
    Posted ByLinuxSecurity Advisories
    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.
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-4387-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                        Yves-Alexis Perez
    February 09, 2019                     https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    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: This email address is being protected from spambots. You need JavaScript enabled to view it.
    
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