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             AUSCERT External Security Bulletin Redistribution

   PAN-OS: OpenSSH software upgraded to resolve multiple vulnerabilities
                                13 May 2020


        AusCERT Security Bulletin Summary

Product:           PAN-OS
Publisher:         Palo Alto
Operating System:  Network Appliance
Impact/Access:     Overwrite Arbitrary Files      -- Remote with User Interaction
                   Provide Misleading Information -- Remote with User Interaction
                   Access Confidential Data       -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-6111 CVE-2019-6109 CVE-2018-20685

Reference:         ASB-2019.0300

Original Bulletin: 

Revision History:  May   13 2020: Vendor released update to clarify product status
                   April  9 2020: Initial Release

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Palo Alto Networks Security Advisories / PAN-SA-2020-0002

PAN-SA-2020-0002 PAN-OS: OpenSSH software upgraded to resolve multiple

Severity 6.8 . MEDIUM
Attack Vector NETWORK
Attack Complexity HIGH
Privileges Required NONE
User Interaction REQUIRED
Confidentiality Impact NONE
Integrity Impact HIGH
Availability Impact HIGH
Published: 2020-04-08
Updated: 2020-05-05
Ref#: PAN-111636


OpenSSH software included with PAN-OS has been upgraded to resolve multiple

These issue affects Palo Alto Networks PAN-OS 7.1 versions before 7.1.26; 8.0
versions before 8.0.21; 8.1 versions before 8.1.13; 9.0 versions before 9.0.7.

The resolved vulnerabilities include:

     CVE          CVSS                           Summary
               5.3 (       In OpenSSH 7.9, scp.c in the scp client allows
               CVSS:3.0/   remote SSH servers to bypass intended access
CVE-2018-20685 AV:N/AC:H/  restrictions via the filename of . or an empty
               PR:N/UI:R/  filename. The impact is modifying the permissions of
               S:U/C:N/I:H the target directory on the client side.
               6.8 (       An issue was discovered in OpenSSH 7.9. Due to
               CVSS:3.0/   missing character encoding in the progress display,
               AV:N/AC:H/  a malicious server (or Man-in-The-Middle attacker)
CVE-2019-6109  PR:N/UI:R/  can employ crafted object names to manipulate the
               S:U/C:H/I:H client output, e.g., by using ANSI control codes to
               /A:N)       hide additional files being transferred. This
                           affects refresh_progress_meter() in progressmeter.c.
                           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
               5.9 (       the client. However, the scp client only performs
               CVSS:3.0/   cursory validation of the object name returned (only
CVE-2019-6111  AV:N/AC:H/  directory traversal attacks are prevented). A
               PR:N/UI:N/  malicious scp server (or Man-in-The-Middle attacker)
               S:U/C:N/I:H can overwrite arbitrary files in the scp client
               /A:N)       target directory. If recursive operation (-r) is
                           performed, the server can manipulate subdirectories
                           as well (for example, to overwrite the .ssh/
                           authorized_keys file).

Product Status


Versions Affected Unaffected
9.0      < 9.0.7  >= 9.0.7
8.1      < 8.1.13 >= 8.1.13
8.0      < 8.0.21 >= 8.0.21
7.1      < 7.1.26 >= 7.1.26

Severity: MEDIUM

CVSSv3.1 Base Score: 6.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H)


These issues are fixed in PAN-OS 7.1.26 (pending release), PAN-OS 8.0.21,
PAN-OS 8.1.13, PAN-OS 9.0.7 and all later versions.

Workarounds and Mitigations

This issue affects the management interface of PAN-OS and is mitigated by
following best practices for securing the PAN-OS management interface. Our best
practices guidelines reduce the exposure of the management interface to
potential attackers. Please review the Best Practices for Securing
Administrative Access in the PAN-OS 8.1 technical documentation, available at:

Terms of usePrivacyProduct Security Assurance and Vulnerability Disclosure
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(C) 2020 Palo Alto Networks, Inc. All rights reserved.

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