Directory Traversal Affecting openssh package, versions <1:7.9p1-9


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.17% (56th percentile)

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  • Snyk IDSNYK-DEBIAN10-OPENSSH-368608
  • 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 Debian:10 openssh to version 1:7.9p1-9 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:10 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 Scores

version 3.1