Directory Traversal Affecting openssh-helpers package, versions <7.6p1-9.23.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.27% (68th percentile)

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  • Snyk IDSNYK-SLES150-OPENSSHHELPERS-2755234
  • published14 Apr 2022
  • disclosed26 Feb 2019

Introduced: 26 Feb 2019

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

How to fix?

Upgrade SLES:15.0 openssh-helpers to version 7.6p1-9.23.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh-helpers package and not the openssh-helpers package as distributed by SLES. See How to fix? for SLES:15.0 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