Improper Input Validation Affecting openssh-clients package, versions <0:8.0p1-3.el8


Severity

Recommended
0.0
medium
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
57.24% (98th percentile)

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  • Snyk IDSNYK-CENTOS8-OPENSSHCLIENTS-2015786
  • published26 Jul 2021
  • disclosed16 Nov 2018

Introduced: 16 Nov 2018

CVE-2019-6111  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade Centos:8 openssh-clients to version 0:8.0p1-3.el8 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh-clients package and not the openssh-clients package as distributed by Centos. See How to fix? for Centos:8 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