Directory Traversal Affecting openssh-debuginfo package, versions <0:7.4p1-21.73.amzn1


Severity

Recommended
0.0
medium
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.23% (61st percentile)

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  • Snyk IDSNYK-AMZN201803-OPENSSHDEBUGINFO-1720128
  • published27 Sept 2021
  • disclosed31 Jan 2019

Introduced: 31 Jan 2019

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

How to fix?

Upgrade Amazon-Linux:2018.03 openssh-debuginfo to version 0:7.4p1-21.73.amzn1 or higher.
This issue was patched in ALAS-2019-1313.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh-debuginfo package and not the openssh-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2018.03 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