Directory Traversal Affecting openssh package, versions <1:7.4p1-10+deb9u6


0.0
medium

Snyk CVSS

    Attack Complexity High
    Integrity High

    Threat Intelligence

    EPSS 0.2% (58th percentile)
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NVD
5.9 medium
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SUSE
4.8 medium
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Red Hat
5.3 medium

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  • Snyk ID SNYK-DEBIAN9-OPENSSH-368607
  • published 15 Jan 2019
  • disclosed 31 Jan 2019

How to fix?

Upgrade Debian:9 openssh to version 1:7.4p1-10+deb9u6 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by Debian. See How to fix? for Debian:9 relevant fixed versions and status.

An issue was discovered in OpenSSH 7.9. 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 performs cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious scp server (or Man-in-The-Middle attacker) can overwrite arbitrary files in the scp client target directory. If recursive operation (-r) is performed, the server can manipulate subdirectories as well (for example, to overwrite the .ssh/authorized_keys file).