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Directory Traversal Affecting openssh package, versions <7.9_p1-r3

Severity

0.0
medium
0
10

    Threat Intelligence

    EPSS
    0.2% (59th percentile)

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  • Snyk ID SNYK-ALPINE312-OPENSSH-588164
  • published 15 Jan 2019
  • disclosed 31 Jan 2019
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Introduced: 15 Jan 2019

CVE-2019-6111 Open this link in a new tab
CWE-22 Open this link in a new tab

How to fix?

Upgrade Alpine:3.12 openssh to version 7.9_p1-r3 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 Alpine. See How to fix? for Alpine:3.12 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
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Snyk

5.9 medium
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    High
  • Availability (A)
    None
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NVD

5.9 medium
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SUSE

4.8 medium
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Red Hat

5.3 medium