Directory Traversal Affecting openssh package, versions <1:6.6p1-2ubuntu2.13


Severity

Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
58.2% (99th percentile)

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  • Snyk IDSNYK-UBUNTU1404-OPENSSH-368610
  • published15 Jan 2019
  • disclosed31 Jan 2019

Introduced: 15 Jan 2019

CVE-2019-6111  (opens in a new tab)
CWE-22  (opens in a new tab)

How to fix?

Upgrade Ubuntu:14.04 openssh to version 1:6.6p1-2ubuntu2.13 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 Ubuntu. See How to fix? for Ubuntu:14.04 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).

References

CVSS Base Scores

version 3.1